Home » Public Forums » GMCnet » onan ignition
| onan ignition [message #165528] |
Fri, 06 April 2012 07:44  |
skip2
Messages: 544
Registered: September 2011
Location: Winter Haven,FL (center o...
Karma: 3
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Got an Onan in 74 coach and been told the standard electronic ign upgrade won't work because of the style of points. Looking at the GMC info site and saw an upgrade using a pertronix from a vw with a pickup and magnet at flywheel. Is this still a viable alternative for electronic ign. in your learned opinions or has something better come out since
Skip Hartline
74 Canyon Lands, FiTech,
3.7 FD LSD, Manny Tranny,
Springfield Distributor,
2001 Chevy Tracker Ragtop Towd
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| Re: [GMCnet] onan ignition [message #165530 is a reply to message #165528] |
Fri, 06 April 2012 07:53  |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Skip,
As one of the first adopters of the Pertronix ignition, I can assure you
that it's by far the best option, regardless of the availability of the
Onan version. However, I'm also responsible for the VW version
recommendation. Others, and I, have since decided that the Pertronix
designed for the Olds (and most other GM V-8's) is a better choice. PN
1180, IIRC. You want the original "Ignitor", NOT the "Ignitor II".
http://www.gmcmhphotos.com/photos/showgallery.php?cat=3608
Many have found that setting the timing several degrees more advanced than
OEM is better.
Ken H.
On Fri, Apr 6, 2012 at 8:44 AM, Skip Hartline wrote:
>
>
> Got an Onan in 74 coach and been told the standard electronic ign upgrade
> won't work because of the style of points. Looking at the GMC info site and
> saw an upgrade using a pertronix from a vw with a pickup and magnet at
> flywheel. Is this still a viable alternative for electronic ign. in your
> learned opinions or has something better come out since.
>
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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| Re: [GMCnet] onan ignition [message #165541 is a reply to message #165533] |
Fri, 06 April 2012 08:49 |
midlf
Messages: 2212
Registered: July 2007
Location: SE Wisc. (Palmyra)
Karma: 1
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| Ken Henderson wrote on Fri, 06 April 2012 07:58 |
Ooops! I'm not positive that 1181 is right, but I am sure that it's NOT
1180!
Ken H.
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1181 is correct.
Steve Southworth
1974 Glacier TZE064V100150 (for workin on)
1975 Transmode TZE365V100394 (parts & spares)
Palmyra WI
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| Re: [GMCnet] onan ignition [message #165546 is a reply to message #165530] |
Fri, 06 April 2012 09:13 |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Ken,
I like you and "others" logic in choosing the Olds version.
I chose the one for VW because it's German! ;-)
Regards,
Rob M.
-----Original Message-----
From: Ken Henderson
Skip,
As one of the first adopters of the Pertronix ignition, I can assure you
that it's by far the best option, regardless of the availability of the
Onan version. However, I'm also responsible for the VW version
recommendation. Others, and I, have since decided that the Pertronix
designed for the Olds (and most other GM V-8's) is a better choice. PN
1180, IIRC. You want the original "Ignitor", NOT the "Ignitor II".
http://www.gmcmhphotos.com/photos/showgallery.php?cat=3608
Many have found that setting the timing several degrees more advanced than
OEM is better.
Ken H.
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
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Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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| Re: onan ignition [message #165547 is a reply to message #165528] |
Fri, 06 April 2012 09:16 |
skip2
Messages: 544
Registered: September 2011
Location: Winter Haven,FL (center o...
Karma: 3
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Great! appreciate the info
Just one more question,. My gen works and runs 2 ac's with no proble but the Po had hardwired power to the coil and points to make it run. From all I've read this would mean the bridge rectifier is ok but there is a board problem, which I just got new one from jimk and going to be putting on soon. Does this sound right. Way back I thought the rectifier had something to do with the voltage to the coil and the charging circuit.
74 Canyon Lands, FiTech,
3.7 FD LSD, Manny Tranny,
Springfield Distributor,
2001 Chevy Tracker Ragtop Towd
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| Re: onan ignition [message #165551 is a reply to message #165547] |
Fri, 06 April 2012 10:59 |
Bob de Kruyff
Messages: 4260
Registered: January 2004
Location: Chandler, AZ
Karma: 1
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| skip2 wrote on Fri, 06 April 2012 08:16 |
Great! appreciate the info
Just one more question,. My gen works and runs 2 ac's with no proble but the Po had hardwired power to the coil and points to make it run. From all I've read this would mean the bridge rectifier is ok but there is a board problem, which I just got new one from jimk and going to be putting on soon. Does this sound right. Way back I thought the rectifier had something to do with the voltage to the coil and the charging circuit.
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The board controls the engine functions but really nothing to do with the charging side. However, You may be thinking of the flywheel alternator that supplies voltage to the board to signal that the engine has started. That circuit has a regulator in it that was meant to charge the Onan cranking battery, but most coaches don't rely on that so there's a work around to take that out of the system. Hope that makes some sense. You can actually run the generator without any board, but none of the safeguards will work.
Bob de Kruyff
78 Eleganza
Chandler, AZ
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| Re: onan ignition [message #165554 is a reply to message #165551] |
Fri, 06 April 2012 11:28 |
skip2
Messages: 544
Registered: September 2011
Location: Winter Haven,FL (center o...
Karma: 3
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Senior Member |
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Thats what i'm doing, Just haven't actually figured out what is producing the voltage to power the 12vdc for the ignition and fuel pump in normal state.Also the suggestion of upping timing sounds interesting but exactly how much has been tried.
Skip
74 Canyon Lands, FiTech,
3.7 FD LSD, Manny Tranny,
Springfield Distributor,
2001 Chevy Tracker Ragtop Towd
[Updated on: Fri, 06 April 2012 11:56] Report message to a moderator |
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| Re: onan ignition [message #165562 is a reply to message #165554] |
Fri, 06 April 2012 12:36 |
Bob de Kruyff
Messages: 4260
Registered: January 2004
Location: Chandler, AZ
Karma: 1
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| skip2 wrote on Fri, 06 April 2012 10:28 |
Thats what i'm doing, Just haven't actually figured out what is producing the voltage to power the 12vdc for the ignition and fuel pump in normal state.Also the suggestion of upping timing sounds interesting but exactly how much has been tried.
Skip
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Without getting too much into the circuit, it is supplied by the 12V battery that is used to crank the Onan.
Bob de Kruyff
78 Eleganza
Chandler, AZ
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| Re: onan ignition [message #165572 is a reply to message #165554] |
Fri, 06 April 2012 15:17 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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Senior Member |
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I have run the timing as high as 29 degrees BTDC as a test. I backed mine off to 27 degrees BTDC. I had an Onan engineer tell me years ago that it would run at 30 degrees BTDC IF THE POINTS TRIGGERING WAS STABLE. Unfortunately with the OEM Onan pushrod setup, the points triggering was not stable so they backed off the timing to make up for that problem.
With the Pertronix mod the triggering time is extremely stable so in my opinion 27 degrees is a good setting. One other thing to note is if the timing is too far advanced you will have starting problems because the plugs fire too soon at slower cranking speeds.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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