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Petronix to Points back conversion [message #347199] Mon, 02 September 2019 09:05 Go to next message
Larry is currently offline  Larry   United States
Messages: 2875
Registered: January 2004
Location: Menomonie, WI
Karma: 10
Senior Member
No...I'm not converting back to points type ignition, just setting up a points type distributor for backup in case the Petronix fails in the middle of nowhere.

I have been running a Pertronix conversion for about 10 yrs. Went to start the thing a couple of days ago, and no start...no spark. There are two kits available for my GM distributor conversion. The 1181 and the 1181LS. The 1181 has a sensor and a ring of 8 magnets that attaches to the fly weights plate under the rotor. The 1181LS (the LS is for Lobe Sensing) is lobe sensing and has only one part to it...the sensor. My distributor had an old version of the 1181 and one of the magnets came loose, dropped out and scored the sensor. In the process, it also cooked the coil. Following a discussion with Dick Paterson, I took his recommendation of having no moving parts and sensing off of the points cam lobes, and purchased the 1181LS. This Pertronix experience has left me wondering what would I have done if the petronix went bad in a place other than my driveway. So I've decided to put together a points type distributor to carry as a back-up. Something I can just drop in that will get me home reliably from anywhere.

Now, to the point of this thread. I am using the LS version with a Pertronix 1.5 ohm coil. My coach is a 78, so the coil ignition wire has 12v with no ballast of any kind when the switch is on "run". Do I need to carry a ballast resistor to place in the circuit so that my points do not burn out on full 12v "run"? Also, I have 5...yes count them five spare coils that I could potentially use, varying in resistance from 1.5 ohms to 2.4 ohms. The two ballast resistors that I have are 1.5 Ohm and 2.2 ohm. What combination of coil and ballast should I carry that will get me home reliably?

I'm doing this because the Pertronix is not something that I can just pull off of the shelf at any auto parts store and is an expensive part to just carry for something that is (according to Dick) highly unlikely to fail.

TIA


Larry Smile
78 Royale w/500 Caddy
Menomonie, WI.
Re: [GMCnet] Petronix to Points back conversion [message #347202 is a reply to message #347199] Mon, 02 September 2019 10:08 Go to previous messageGo to next message
James Hupy is currently offline  James Hupy   United States
Messages: 6806
Registered: May 2010
Karma: -62
Senior Member
The real problem with ANY POINTS DRIVEN ignition is not deterioration of
the points themselves, but rubbing block or points plunger wear. It might
be right when you originally set it, but opening time varies with the
plunger or rubbing block wear. Fact of life. Can't prevent it. Best is like
Dick says. "No moving parts in contact with each other."
Jim Hupy

On Mon, Sep 2, 2019, 7:06 AM Larry via Gmclist
wrote:

> No...I'm not converting back to points type ignition, just setting up a
> points type distributor for backup in case the Petronix fails in the middle
> of
> nowhere.
>
> I have been running a Pertronix conversion for about 10 yrs. Went to start
> the thing a couple of days ago, and no start...no spark. There are two kits
> available for my GM distributor conversion. The 1181 and the 1181LS. The
> 1181 has a sensor and a ring of 8 magnets that attaches to the fly weights
> plate under the rotor. The 1181LS (the LS is for Lobe Sensing) is lobe
> sensing and has only one part to it...the sensor. My distributor had an old
> version of the 1181 and one of the magnets came loose, dropped out and
> scored the sensor. In the process, it also cooked the coil. Following a
> discussion with Dick Paterson, I took his recommendation of having no
> moving parts and sensing off of the points cam lobes, and purchased the
> 1181LS.
> This Pertronix experience has left me wondering what would I have done if
> the petronix went bad in a place other than my driveway. So I've decided to
> put together a points type distributor to carry as a back-up. Something I
> can just drop in that will get me home reliably from anywhere.
>
> Now, to the point of this thread. I am using the LS version with a
> Pertronix 1.5 ohm coil. My coach is a 78, so the coil ignition wire has 12v
> with no
> ballast of any kind when the switch is on "run". Do I need to carry a
> ballast resistor to place in the circuit so that my points do not burn out
> on
> full 12v "run"? Also, I have 5...yes count them five spare coils that I
> could potentially use, varying in resistance from 1.5 ohms to 2.4 ohms. The
> two ballast resistors that I have are 1.5 Ohm and 2.2 ohm. What
> combination of coil and ballast should I carry that will get me home
> reliably?
>
> I'm doing this because the Pertronix is not something that I can just pull
> off of the shelf at any auto parts store and is an expensive part to just
> carry for something that is (according to Dick) highly unlikely to fail.
>
> TIA
> --
> Larry
> 78 Royale w/500 Caddy
> Menomonie, WI.
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
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Re: [GMCnet] Petronix to Points back conversion [message #347205 is a reply to message #347202] Mon, 02 September 2019 10:29 Go to previous messageGo to next message
jimk is currently offline  jimk   United States
Messages: 6734
Registered: July 2006
Location: Belmont, CA
Karma: 9
Senior Member
You need to understand the Petroic unit are not just a switching unit, but
an ignition enhancer unit.
That is why they work well.
If you have a 78 coach, some one has switched the standard HEI with the
unit.
Your going backward by installing the standard point system as it will
underperform.
If your concerned about availability of part on the road, those parts are
available at most performance parts outlet.
We stock some and we can overnight them.

On Mon, Sep 2, 2019 at 8:07 AM James Hupy via Gmclist <
gmclist@list.gmcnet.org> wrote:

> The real problem with ANY POINTS DRIVEN ignition is not deterioration of
> the points themselves, but rubbing block or points plunger wear. It might
> be right when you originally set it, but opening time varies with the
> plunger or rubbing block wear. Fact of life. Can't prevent it. Best is like
> Dick says. "No moving parts in contact with each other."
> Jim Hupy
>
> On Mon, Sep 2, 2019, 7:06 AM Larry via Gmclist
> wrote:
>
>> No...I'm not converting back to points type ignition, just setting up a
>> points type distributor for backup in case the Petronix fails in the
> middle
>> of
>> nowhere.
>>
>> I have been running a Pertronix conversion for about 10 yrs. Went to
> start
>> the thing a couple of days ago, and no start...no spark. There are two
> kits
>> available for my GM distributor conversion. The 1181 and the 1181LS. The
>> 1181 has a sensor and a ring of 8 magnets that attaches to the fly
> weights
>> plate under the rotor. The 1181LS (the LS is for Lobe Sensing) is lobe
>> sensing and has only one part to it...the sensor. My distributor had an
> old
>> version of the 1181 and one of the magnets came loose, dropped out and
>> scored the sensor. In the process, it also cooked the coil. Following a
>> discussion with Dick Paterson, I took his recommendation of having no
>> moving parts and sensing off of the points cam lobes, and purchased the
>> 1181LS.
>> This Pertronix experience has left me wondering what would I have done if
>> the petronix went bad in a place other than my driveway. So I've decided
> to
>> put together a points type distributor to carry as a back-up. Something I
>> can just drop in that will get me home reliably from anywhere.
>>
>> Now, to the point of this thread. I am using the LS version with a
>> Pertronix 1.5 ohm coil. My coach is a 78, so the coil ignition wire has
> 12v
>> with no
>> ballast of any kind when the switch is on "run". Do I need to carry a
>> ballast resistor to place in the circuit so that my points do not burn
> out
>> on
>> full 12v "run"? Also, I have 5...yes count them five spare coils that I
>> could potentially use, varying in resistance from 1.5 ohms to 2.4 ohms.
> The
>> two ballast resistors that I have are 1.5 Ohm and 2.2 ohm. What
>> combination of coil and ballast should I carry that will get me home
>> reliably?
>>
>> I'm doing this because the Pertronix is not something that I can just
> pull
>> off of the shelf at any auto parts store and is an expensive part to just
>> carry for something that is (according to Dick) highly unlikely to fail.
>>
>> TIA
>> --
>> Larry
>> 78 Royale w/500 Caddy
>> Menomonie, WI.
>>
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>


--
Jim Kanomata
Applied/GMC, Newark,CA
jimk@appliedairfilters.com
http://www.appliedgmc.com
1-800-752-7502
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Jim Kanomata
Applied/GMC
jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502
Re: [GMCnet] Petronix to Points back conversion [message #347207 is a reply to message #347205] Mon, 02 September 2019 10:34 Go to previous messageGo to next message
jimk is currently offline  jimk   United States
Messages: 6734
Registered: July 2006
Location: Belmont, CA
Karma: 9
Senior Member
I'm sorry some make changes w/o understanding what some these strange parts
do.
Sometimes being 76 years old and messing with cars does help. Notice I have
forgotten lot, but still flap my mouth.

On Mon, Sep 2, 2019 at 8:29 AM Jim Kanomata wrote:

> You need to understand the Petroic unit are not just a switching unit, but
> an ignition enhancer unit.
> That is why they work well.
> If you have a 78 coach, some one has switched the standard HEI with the
> unit.
> Your going backward by installing the standard point system as it will
> underperform.
> If your concerned about availability of part on the road, those parts are
> available at most performance parts outlet.
> We stock some and we can overnight them.
>
> On Mon, Sep 2, 2019 at 8:07 AM James Hupy via Gmclist gmclist@list.gmcnet.org> wrote:
>
>> The real problem with ANY POINTS DRIVEN ignition is not deterioration of
>> the points themselves, but rubbing block or points plunger wear. It might
>> be right when you originally set it, but opening time varies with the
>> plunger or rubbing block wear. Fact of life. Can't prevent it. Best is
>> like
>> Dick says. "No moving parts in contact with each other."
>> Jim Hupy
>>
>> On Mon, Sep 2, 2019, 7:06 AM Larry via Gmclist
>> wrote:
>>
>>> No...I'm not converting back to points type ignition, just setting up a
>>> points type distributor for backup in case the Petronix fails in the
>> middle
>>> of
>>> nowhere.
>>>
>>> I have been running a Pertronix conversion for about 10 yrs. Went to
>> start
>>> the thing a couple of days ago, and no start...no spark. There are two
>> kits
>>> available for my GM distributor conversion. The 1181 and the 1181LS.
>> The
>>> 1181 has a sensor and a ring of 8 magnets that attaches to the fly
>> weights
>>> plate under the rotor. The 1181LS (the LS is for Lobe Sensing) is lobe
>>> sensing and has only one part to it...the sensor. My distributor had
>> an old
>>> version of the 1181 and one of the magnets came loose, dropped out and
>>> scored the sensor. In the process, it also cooked the coil. Following a
>>> discussion with Dick Paterson, I took his recommendation of having no
>>> moving parts and sensing off of the points cam lobes, and purchased the
>>> 1181LS.
>>> This Pertronix experience has left me wondering what would I have done
>> if
>>> the petronix went bad in a place other than my driveway. So I've
>> decided to
>>> put together a points type distributor to carry as a back-up. Something
>> I
>>> can just drop in that will get me home reliably from anywhere.
>>>
>>> Now, to the point of this thread. I am using the LS version with a
>>> Pertronix 1.5 ohm coil. My coach is a 78, so the coil ignition wire has
>> 12v
>>> with no
>>> ballast of any kind when the switch is on "run". Do I need to carry a
>>> ballast resistor to place in the circuit so that my points do not burn
>> out
>>> on
>>> full 12v "run"? Also, I have 5...yes count them five spare coils that I
>>> could potentially use, varying in resistance from 1.5 ohms to 2.4 ohms.
>> The
>>> two ballast resistors that I have are 1.5 Ohm and 2.2 ohm. What
>>> combination of coil and ballast should I carry that will get me home
>>> reliably?
>>>
>>> I'm doing this because the Pertronix is not something that I can just
>> pull
>>> off of the shelf at any auto parts store and is an expensive part to
>> just
>>> carry for something that is (according to Dick) highly unlikely to fail.
>>>
>>> TIA
>>> --
>>> Larry
>>> 78 Royale w/500 Caddy
>>> Menomonie, WI.
>>>
>>> _______________________________________________
>>> GMCnet mailing list
>>> Unsubscribe or Change List Options:
>>> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>>>
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>>
>
>
> --
> Jim Kanomata
> Applied/GMC, Newark,CA
> jimk@appliedairfilters.com
> http://www.appliedgmc.com
> 1-800-752-7502
>


--
Jim Kanomata
Applied/GMC, Newark,CA
jimk@appliedairfilters.com
http://www.appliedgmc.com
1-800-752-7502
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org



Jim Kanomata
Applied/GMC
jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502
Re: Petronix to Points back conversion [message #347208 is a reply to message #347199] Mon, 02 September 2019 10:44 Go to previous messageGo to next message
rjw   United States
Messages: 697
Registered: September 2005
Karma: 4
Senior Member
Larry wrote on Mon, 02 September 2019 10:05


Now, to the point of this thread. I am using the LS version with a Pertronix 1.5 ohm coil. My coach is a 78, so the coil ignition wire has 12v with no ballast of any kind when the switch is on "run". Do I need to carry a ballast resistor to place in the circuit so that my points do not burn out on full 12v "run"? Also, I have 5...yes count them five spare coils that I could potentially use, varying in resistance from 1.5 ohms to 2.4 ohms. The two ballast resistors that I have are 1.5 Ohm and 2.2 ohm. What combination of coil and ballast should I carry that will get me home reliably?

I'm doing this because the Pertronix is not something that I can just pull off of the shelf at any auto parts store and is an expensive part to just carry for something that is (according to Dick) highly unlikely to fail.

TIA
I have no idea what to suggest as to an answer to your question. But it makes me think about the spares I should carry. I have a Howell TBI with EBL and computer controlled distributor. I carry a complete complete computer controlled distributor as a spare as well as the original (supplied by Howell) TBI computer and a spare fuel pump. I've had to raid parts from the spare distributor during trips when I experienced engine problems. I have a complete HEI distributor (redone by Springfield) in storage in my attic at home. I wonder if if would make sense to carry it in the coach rather then store it in my attic so that in the event I needed to revert to the original TBI installation on a trip I could. I admit that this is probably overkill, but I am a "belt and suspenders" guy for when things go bad.

In the past 21 years I've been on the side of road several times and each time the engine died, it was ignition related. Even when the engine caught on fire years back, the flames took out the distributor and spark plug wires and caused me to coast to the side of the road.

http://www.palmbeachgmc.com/hei.html
http://www.palmbeachgmc.com/fire.html



Richard
76 Palm Beach
SE Michigan
www.PalmBeachGMC.com

Roller Cam 455, TBI+EBL, 3.42 FD, 4 Bag, Macerator, Lenzi (brakes, vacuum system, front end stuff), Manny Tranny, vacuum step, Tankless + OEM water heaters.
Re: Petronix to Points back conversion [message #347209 is a reply to message #347199] Mon, 02 September 2019 10:52 Go to previous messageGo to next message
ljdavick is currently offline  ljdavick   United States
Messages: 3548
Registered: March 2007
Location: Fremont, CA
Karma: -3
Senior Member
Larry,

I know you have to unwrap the Onan to get to the Pertronix, but why not keep a spare Pertronix that could be swapped in if you have a failure. It seems to me that it's more work on the side of the road, but no more work than you'll have to do at some point. If you practice like a pit-crew you could probably do int in 15 minutes!!!

I suppose that the timing could be off between different Pertronix units, but then the timing for the points would not be assured either.

Just my $.02.


Larry Davick
A Mystery Machine
1976(ish) Palm Beach
Fremont, Ca
Howell EFI + EBL + Electronic Dizzy
Re: [GMCnet] Petronix to Points back conversion [message #347211 is a reply to message #347208] Mon, 02 September 2019 11:20 Go to previous messageGo to next message
GMC.LES is currently offline  GMC.LES   United States
Messages: 505
Registered: April 2014
Karma: -2
Senior Member
Larry,
Perhaps I’m mis-interpreting what you are trying to do. You have a pertronics equipped dist in your engine and want to carry a points equipped dist as a spare. I interpret this to mean that you have two points-type distributors.

Why not just carry a spare set of points and leave the distributor at home? Unless you have created a unique set-up, the pertronics unit should easily interchange with a set of points, thus only requiring that you carry a new set of points as spares. Swapping in a set of points shouldn’t be any more time consuming than swapping a dist, and the space required for spare points is minimal. I’d also consider carrying a spare pertronics unit along with a set of points. All in the same box.

Les Burt
Montreal
'75 Eleganza 26'


> On Sep 2, 2019, at 11:45 AM, RJW via Gmclist wrote:
>
> Larry wrote on Mon, 02 September 2019 10:05
>> Now, to the point of this thread. I am using the LS version with a Pertronix 1.5 ohm coil. My coach is a 78, so the coil ignition wire has 12v
>> with no ballast of any kind when the switch is on "run". Do I need to carry a ballast resistor to place in the circuit so that my points do not burn
>> out on full 12v "run"? Also, I have 5...yes count them five spare coils that I could potentially use, varying in resistance from 1.5 ohms to 2.4
>> ohms. The two ballast resistors that I have are 1.5 Ohm and 2.2 ohm. What combination of coil and ballast should I carry that will get me home
>> reliably?
>>
>> I'm doing this because the Pertronix is not something that I can just pull off of the shelf at any auto parts store and is an expensive part to
>> just carry for something that is (according to Dick) highly unlikely to fail.
>>
>> TIA
>
> I have no idea what to suggest as to an answer to your question. But it makes me think about the spares I should carry. I have a Howell TBI with EBL
> and computer controlled distributor. I carry a complete complete computer controlled distributor as a spare as well as the original (supplied by
> Howell) TBI computer and a spare fuel pump. I've had to raid parts from the spare distributor during trips when I experienced engine problems. I
> have a complete HEI distributor (redone by Springfield) in storage in my attic at home. I wonder if if would make sense to carry it in the coach
> rather then store it in my attic so that in the event I needed to revert to the original TBI installation on a trip I could. I admit that this is
> probably overkill, but I am a "belt and suspenders" guy for when things go bad.
>
> In the past 21 years I've been on the side of road several times and each time the engine died, it was ignition related. Even when the engine caught
> on fire years back, the flames took out the distributor and spark plug wires and caused me to coast to the side of the road.
>
> http://www.palmbeachgmc.com/hei.html
> http://www.palmbeachgmc.com/fire.html
>
>
> --
> Richard
> 76 Palm Beach
> SE Michigan
> www.PalmBeachGMC.com
>
>
> Coop Roller Cam 455, Howell TBI + EBL, 3.42 FD, Quadra Bag, Macerator, Lenzi stuff, Manny Tranny etc.
>
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org

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Re: [GMCnet] Petronix to Points back conversion [message #347212 is a reply to message #347211] Mon, 02 September 2019 11:56 Go to previous messageGo to next message
jimk is currently offline  jimk   United States
Messages: 6734
Registered: July 2006
Location: Belmont, CA
Karma: 9
Senior Member
My two bit .
Carrying a whole distributor can be beneficial, however the parts that
generally go bad is the module and coil.
During the last 37 years of running the coach and racking over million
miles, you'll find that I carry spare parts that occupy half a shoe box.
I have lot of customers that do not do any wrenching , so I advise them to
carry the ignition part and fuel filters and make sure the generator works
and spare tire is full and they have the Black list and our phone #.
I have spent many hours on side of road waiting for tow truck.
expect at least 1 1/2 -2 1/2 hour after calling for tow truck.

On Mon, Sep 2, 2019 at 9:21 AM Les Burt via Gmclist
wrote:

> Larry,
> Perhaps I’m mis-interpreting what you are trying to do. You have a
> pertronics equipped dist in your engine and want to carry a points equipped
> dist as a spare. I interpret this to mean that you have two points-type
> distributors.
>
> Why not just carry a spare set of points and leave the distributor at
> home? Unless you have created a unique set-up, the pertronics unit should
> easily interchange with a set of points, thus only requiring that you carry
> a new set of points as spares. Swapping in a set of points shouldn’t be any
> more time consuming than swapping a dist, and the space required for spare
> points is minimal. I’d also consider carrying a spare pertronics unit along
> with a set of points. All in the same box.
>
> Les Burt
> Montreal
> '75 Eleganza 26'
>
>
>> On Sep 2, 2019, at 11:45 AM, RJW via Gmclist
> wrote:
>>
>> Larry wrote on Mon, 02 September 2019 10:05
>>> Now, to the point of this thread. I am using the LS version with a
> Pertronix 1.5 ohm coil. My coach is a 78, so the coil ignition wire has 12v
>>> with no ballast of any kind when the switch is on "run". Do I need to
> carry a ballast resistor to place in the circuit so that my points do not
> burn
>>> out on full 12v "run"? Also, I have 5...yes count them five spare coils
> that I could potentially use, varying in resistance from 1.5 ohms to 2.4
>>> ohms. The two ballast resistors that I have are 1.5 Ohm and 2.2 ohm.
> What combination of coil and ballast should I carry that will get me home
>>> reliably?
>>>
>>> I'm doing this because the Pertronix is not something that I can just
> pull off of the shelf at any auto parts store and is an expensive part to
>>> just carry for something that is (according to Dick) highly unlikely to
> fail.
>>>
>>> TIA
>>
>> I have no idea what to suggest as to an answer to your question. But it
> makes me think about the spares I should carry. I have a Howell TBI with
> EBL
>> and computer controlled distributor. I carry a complete complete
> computer controlled distributor as a spare as well as the original
> (supplied by
>> Howell) TBI computer and a spare fuel pump. I've had to raid parts from
> the spare distributor during trips when I experienced engine problems. I
>> have a complete HEI distributor (redone by Springfield) in storage in my
> attic at home. I wonder if if would make sense to carry it in the coach
>> rather then store it in my attic so that in the event I needed to revert
> to the original TBI installation on a trip I could. I admit that this is
>> probably overkill, but I am a "belt and suspenders" guy for when things
> go bad.
>>
>> In the past 21 years I've been on the side of road several times and
> each time the engine died, it was ignition related. Even when the engine
> caught
>> on fire years back, the flames took out the distributor and spark plug
> wires and caused me to coast to the side of the road.
>>
>> http://www.palmbeachgmc.com/hei.html
>> http://www.palmbeachgmc.com/fire.html
>>
>>
>> --
>> Richard
>> 76 Palm Beach
>> SE Michigan
>> www.PalmBeachGMC.com
>>
>>
>> Coop Roller Cam 455, Howell TBI + EBL, 3.42 FD, Quadra Bag, Macerator,
> Lenzi stuff, Manny Tranny etc.
>>
>>
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>


--
Jim Kanomata
Applied/GMC, Newark,CA
jimk@appliedairfilters.com
http://www.appliedgmc.com
1-800-752-7502
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
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Jim Kanomata
Applied/GMC
jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502
Re: Petronix to Points back conversion [message #347215 is a reply to message #347199] Mon, 02 September 2019 12:42 Go to previous messageGo to next message
Larry is currently offline  Larry   United States
Messages: 2875
Registered: January 2004
Location: Menomonie, WI
Karma: 10
Senior Member
OK, so I guess I was not clear with my posting. This is a Pertronix upgrade to the Distributor in a Cadillac engine that went bad not a Pertronix Onan upgrade. I have replaced the Pertronix sensor and the engine is now running just fine. I have already decided that I will be carrying a spare points type distributor, because I already have the parts to do it. No need to spend any more money. I realize that it is going backwards to a points type distributor, but it is only temporary...just to get me off of the road and home.

So, I just need to know if I need to carry a ballast resistor to put in the circuit, and what coil and ballast to carry. Do I need to carry a ballast resistor to place in the circuit so that my points do not burn out on full 12v "run"? I have 5...yes count them five spare coils that I could potentially use, varying in resistance from 1.5 ohms to 2.4 ohms. The two ballast resistors that I have are 1.5 Ohm and 2.2 ohm. What combination of coil and ballast should I carry that will get me home reliably?

Again, this is just carrying spare parts in case of failure and only to get me home.


Larry Smile
78 Royale w/500 Caddy
Menomonie, WI.
Re: Petronix to Points back conversion [message #347216 is a reply to message #347199] Mon, 02 September 2019 12:50 Go to previous messageGo to next message
Larry is currently offline  Larry   United States
Messages: 2875
Registered: January 2004
Location: Menomonie, WI
Karma: 10
Senior Member
I am fortunate that this happened at home. While replacing the Pertronix sensor, I also discovered that the flex ground wire between the points plate and the distributor body had broken, and the vacuum canister was leaking providing no vacuum for vacuum advance. Replaced both items and the LS sensor in my driveway...not on the road. Sometimes perceived bad things happen for a good reason. Smile

Larry Smile
78 Royale w/500 Caddy
Menomonie, WI.
Re: Petronix to Points back conversion [message #347217 is a reply to message #347209] Mon, 02 September 2019 13:49 Go to previous messageGo to next message
ljdavick is currently offline  ljdavick   United States
Messages: 3548
Registered: March 2007
Location: Fremont, CA
Karma: -3
Senior Member
talk about misinterpreting - I read Pertronix and thought Onan! Disregard my points (ha ha) entirely.

Larry Davick
A Mystery Machine
1976(ish) Palm Beach
Fremont, Ca
Howell EFI + EBL + Electronic Dizzy
Re: [GMCnet] Petronix to Points back conversion [message #347229 is a reply to message #347212] Mon, 02 September 2019 15:41 Go to previous messageGo to next message
rjw   United States
Messages: 697
Registered: September 2005
Karma: 4
Senior Member
jimk wrote on Mon, 02 September 2019 12:56
My two bit .
Carrying a whole distributor can be beneficial, however the parts that
generally go bad is the module and coil.
During the last 37 years of running the coach and racking over million
miles, you'll find that I carry spare parts that occupy half a shoe box.
I have lot of customers that do not do any wrenching , so I advise them to
carry the ignition part and fuel filters and make sure the generator works
and spare tire is full and they have the Black list and our phone #.
I have spent many hours on side of road waiting for tow truck.
expect at least 1 1/2 -2 1/2 hour after calling for tow truck.

--
Jim Kanomata
Jim,
While you might only carry a shoe box full of spare parts, you are unique with the full stock of spare parts that you carry at your place.

Personally, the last thing I want to do is have to wait on a tow truck. The last time (last year) it took over 4 hours of waiting outside in the cold (I will not wait in the coach while trucks are whizzing by at 80MPH mere inches from the coach). A second or two of distracted driving and I could be history.

So I want to carry stuff that will allow me to fix the coach to avoid the tow. Except for 3 times in the last 21 years I have avoided being towed. I also have 3 towing service providers. Possibly unnecessary and over kill, but I like the redundancy of "belt and suspenders".


Richard
76 Palm Beach
SE Michigan
www.PalmBeachGMC.com

Roller Cam 455, TBI+EBL, 3.42 FD, 4 Bag, Macerator, Lenzi (brakes, vacuum system, front end stuff), Manny Tranny, vacuum step, Tankless + OEM water heaters.
Re: [GMCnet] Petronix to Points back conversion [message #347232 is a reply to message #347229] Mon, 02 September 2019 16:01 Go to previous messageGo to next message
jimk is currently offline  jimk   United States
Messages: 6734
Registered: July 2006
Location: Belmont, CA
Karma: 9
Senior Member
That is why I preach to have your generator available and keep lpg at least
half full .
Generator is really a life savor

On Mon, Sep 2, 2019 at 1:44 PM RJW via Gmclist
wrote:

> jimk wrote on Mon, 02 September 2019 12:56
>> My two bit .
>> Carrying a whole distributor can be beneficial, however the parts that
>> generally go bad is the module and coil.
>> During the last 37 years of running the coach and racking over million
>> miles, you'll find that I carry spare parts that occupy half a shoe box.
>> I have lot of customers that do not do any wrenching , so I advise them
> to
>> carry the ignition part and fuel filters and make sure the generator
> works
>> and spare tire is full and they have the Black list and our phone #.
>> I have spent many hours on side of road waiting for tow truck.
>> expect at least 1 1/2 -2 1/2 hour after calling for tow truck.
>>
>> --
>> Jim Kanomata
>
> Jim,
> While you might only carry a shoe box full of spare parts, you are unique
> with the full stock of spare parts that you carry at your place.
>
> Personally, the last thing I want to do is have to wait on a tow truck.
> The last time (last year) it took over 4 hours of waiting outside in the
> cold
> (I will not wait in the coach while trucks are whizzing by at 80MPH mere
> inches from the coach). A second or two of distracted driving and I could be
> history.
>
> So I want to carry stuff that will allow me to fix the coach to avoid the
> tow. Except for 3 times in the last 21 years I have avoided being towed. I
> also have 3 towing service providers. Possibly unnecessary and over kill,
> but I like the redundancy of "belt and suspenders".
>
> --
> Richard
> 76 Palm Beach
> SE Michigan
> www.PalmBeachGMC.com
>
>
> Coop Roller Cam 455, Howell TBI + EBL, 3.42 FD, Quadra Bag, Macerator,
> Lenzi stuff, Manny Tranny etc.
>
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
--
Jim Kanomata
Applied/GMC, Newark,CA
jimk@appliedairfilters.com
http://www.appliedgmc.com
1-800-752-7502
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Jim Kanomata
Applied/GMC
jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502
Re: [GMCnet] Petronix to Points back conversion [message #347234 is a reply to message #347202] Mon, 02 September 2019 16:05 Go to previous messageGo to next message
jimk is currently offline  jimk   United States
Messages: 6734
Registered: July 2006
Location: Belmont, CA
Karma: 9
Senior Member
I have three towing options.
Best is my coach insurance.
I can call any to tow and send the copy of bill to them to reimburse me.
Get lot more faster response as they will earn full amount, not a
discounted rate.

On Mon, Sep 2, 2019 at 2:01 PM Jim Kanomata wrote:

> That is why I preach to have your generator available and keep lpg at
> least half full .
> Generator is really a life savor
>
> On Mon, Sep 2, 2019 at 1:44 PM RJW via Gmclist
> wrote:
>
>> jimk wrote on Mon, 02 September 2019 12:56
>>> My two bit .
>>> Carrying a whole distributor can be beneficial, however the parts that
>>> generally go bad is the module and coil.
>>> During the last 37 years of running the coach and racking over million
>>> miles, you'll find that I carry spare parts that occupy half a shoe box.
>>> I have lot of customers that do not do any wrenching , so I advise them
>> to
>>> carry the ignition part and fuel filters and make sure the generator
>> works
>>> and spare tire is full and they have the Black list and our phone #.
>>> I have spent many hours on side of road waiting for tow truck.
>>> expect at least 1 1/2 -2 1/2 hour after calling for tow truck.
>>>
>>> --
>>> Jim Kanomata
>>
>> Jim,
>> While you might only carry a shoe box full of spare parts, you are unique
>> with the full stock of spare parts that you carry at your place.
>>
>> Personally, the last thing I want to do is have to wait on a tow truck.
>> The last time (last year) it took over 4 hours of waiting outside in the
>> cold
>> (I will not wait in the coach while trucks are whizzing by at 80MPH mere
>> inches from the coach). A second or two of distracted driving and I could be
>> history.
>>
>> So I want to carry stuff that will allow me to fix the coach to avoid the
>> tow. Except for 3 times in the last 21 years I have avoided being towed. I
>> also have 3 towing service providers. Possibly unnecessary and over
>> kill, but I like the redundancy of "belt and suspenders".
>>
>> --
>> Richard
>> 76 Palm Beach
>> SE Michigan
>> www.PalmBeachGMC.com
>>
>>
>> Coop Roller Cam 455, Howell TBI + EBL, 3.42 FD, Quadra Bag, Macerator,
>> Lenzi stuff, Manny Tranny etc.
>>
>>
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>>
> --
> Jim Kanomata
> Applied/GMC, Newark,CA
> jimk@appliedairfilters.com
> http://www.appliedgmc.com
> 1-800-752-7502
>
--
Jim Kanomata
Applied/GMC, Newark,CA
jimk@appliedairfilters.com
http://www.appliedgmc.com
1-800-752-7502
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Jim Kanomata
Applied/GMC
jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502
Re: [GMCnet] Petronix to Points back conversion [message #347235 is a reply to message #347234] Mon, 02 September 2019 16:22 Go to previous messageGo to next message
captjack is currently offline  captjack   United States
Messages: 271
Registered: February 2010
Location: Sebastopol, California
Karma: 1
Senior Member
Jim,
Who do you use for "Coach Insurance". I like your towing provision.
Thanks


Jack Christensen - K6ROW, '76 Glenbrook/Clasco - "The Silver Bullet", Sebastopol, CA
Re: Petronix to Points back conversion [message #347236 is a reply to message #347199] Mon, 02 September 2019 17:09 Go to previous messageGo to next message
lqqkatjon is currently offline  lqqkatjon   United States
Messages: 2324
Registered: October 2010
Location: St. Cloud, MN
Karma: 5
Senior Member
If it was me. And I should probably do this.

I would keep a complete pertronix set up distributor that matches what you are running. If your going to swap it out, do it once so you dont have to swap back later.

Then keep a separate set of points or whatever for the .05% chance your replacement distributor/pertonics went bad during storage.

As for ballast resistor, I am pretty sure you dont have to worry about that unless your running points permanent. They will not burn up overnight with full 12volts. And hopefully by then you will be back to fixing the pertronix one you run all the time. You have to consider that the balast resistor is bypassed at crank. So if you don't wire it full 12v at crank you could have starting trouble.


Jon Roche 75 palm beach EBL EFI, manny headers, Micro Level, rebuilt most of coach now. St. Cloud, MN http://lqqkatjon.blogspot.com/
Re: [GMCnet] Petronix to Points back conversion [message #347238 is a reply to message #347236] Mon, 02 September 2019 17:28 Go to previous messageGo to next message
jimk is currently offline  jimk   United States
Messages: 6734
Registered: July 2006
Location: Belmont, CA
Karma: 9
Senior Member
I use State Farm, however almost all auto insurers have provision.
I like the AAA as they care not where to be towed, but they use the least
expensive, so it is a miracle if they get to you in 2 hours. When i use my
auto insurance I can demand a quick service or go to anther tow co.

On Mon, Sep 2, 2019 at 3:23 PM Jon Roche via Gmclist <
gmclist@list.gmcnet.org> wrote:

> If it was me. And I should probably do this.
>
> I would keep a complete pertronix set up distributor that matches what you
> are running. If your going to swap it out, do it once so you dont have
> to swap back later.
>
> Then keep a separate set of points or whatever for the .05% chance your
> replacement distributor/pertonics went bad during storage.
>
> As for ballast resistor, I am pretty sure you dont have to worry about
> that unless your running points permanent. They will not burn up overnight
> with full 12volts. And hopefully by then you will be back to fixing the
> pertronix one you run all the time. You have to consider that the
> balast resistor is bypassed at crank. So if you don't wire it full 12v
> at crank you could have starting trouble.
> --
> Jon Roche
> 75 palm beach
> St. Cloud, MN
> http://lqqkatjon.blogspot.com/
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>


--
Jim Kanomata
Applied/GMC, Newark,CA
jimk@appliedairfilters.com
http://www.appliedgmc.com
1-800-752-7502
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Jim Kanomata
Applied/GMC
jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502
Re: Petronix to Points back conversion [message #347246 is a reply to message #347199] Mon, 02 September 2019 20:05 Go to previous messageGo to next message
JohnL455 is currently offline  JohnL455   United States
Messages: 4447
Registered: October 2006
Location: Woodstock, IL
Karma: 12
Senior Member
I installed the lobe sensing unit in a 69 Buick GS400 distributor and retained the factory resistance wire. I put the points, condenser and ground wire in a baggie in the glove box. That seems easier to swap out than the entire distributor with hold down etc and having to retime.

John Lebetski
Woodstock, IL
77 Eleganza II
Re: Petronix to Points back conversion [message #347249 is a reply to message #347246] Mon, 02 September 2019 21:08 Go to previous messageGo to next message
Larry is currently offline  Larry   United States
Messages: 2875
Registered: January 2004
Location: Menomonie, WI
Karma: 10
Senior Member
JohnL455 wrote on Mon, 02 September 2019 20:05
I installed the lobe sensing unit in a 69 Buick GS400 distributor and retained the factory resistance wire. I put the points, condenser and ground wire in a baggie in the glove box. That seems easier to swap out than the entire distributor with hold down etc and having to retime.
HI John,
Thanks for that. The 78 GMC does not have a resistance wire going to the coil. So, there is a full 12v there. I have a cadillac engine and the distributor is in a location that makes changing the distributor parts an exercise in contortionism. It really is easier to pull the distributor to replace parts or in this case put another distributor in. I still need to know if the points will survive a...say...1200mile drive home with the full 12v going to it. If not, what coil and ballast combination of the parts I have, will get me home?


Larry Smile
78 Royale w/500 Caddy
Menomonie, WI.
Re: Petronix to Points back conversion [message #347257 is a reply to message #347199] Tue, 03 September 2019 02:22 Go to previous messageGo to previous message
Ken Burton is currently offline  Ken Burton   United States
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
Senior Member
Larry, I am very confused as to what you are doing and why. I did some research and the Cadillac 500 in at least some years had an HEI distributor. Why not forget the points system all together and just carry a complete HEI and be done with it. Swap the distributor in, plug in the +12 volts, 8 spark plug wires, and vacuum advance and you will be done. Set the timing and drive home.

With the HEI swap in you get everything replaced except the wires and plugs. It takes a +12 volts in without a ballast resistor and it just runs. There is nothing mechanical to set, or keep clean, or wear like a points system. You could be on the road in 15 minutes. just get the rotor pointing to the correct cylinder when you insert the new one into the engine hole. I bought a new cheepie Chinese one years ago and carry it. I installed it once to make sure I had a good spare and then stored is somewhere in my coach I thought about attaching a doggie treat to it so my dog could find by smell if I ever needed it.


Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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