Home » Public Forums » GMCnet » [GMCnet] SPARK PLUGS
| [GMCnet] SPARK PLUGS [message #106289] |
Sat, 20 November 2010 12:56  |
larry erd
Messages: 132
Registered: August 2010
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Ok, my 403 is now rebuilt and it will be awhile before it is back in the
coach,
what spark plugs do you recommend for a carbed engine w / a comp cam??
I want to keep all the holes plugged and covered while I make a lot on dust
and dirt
working on the chassis.
thanks,
larry erd
77 kingley
lake ashton, fl.
PS; how do i know i have the proper quad jet carb??
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| Re: [GMCnet] SPARK PLUGS [message #106290 is a reply to message #106289] |
Sat, 20 November 2010 13:03  |
powerjon
Messages: 2446
Registered: January 2004
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See the following file:
http://www.gmcmhphotos.com/photos/data/5237/Spark_Plug_Application_Gu.pdf
It is a pdf file. You will have to open it.
Couldn't find my list of carbs.
Emory might have it.
J.R. Wright
GMC GreatLaker
TZE Zone Restorations
77 Eleganza Custom (For Sale)
1975 Avion (Under Reconstruction)
Michigan
On Nov 20, 2010, at 1:56 PM, larry erd wrote:
> Ok, my 403 is now rebuilt and it will be awhile before it is back in
> the
> coach,
> what spark plugs do you recommend for a carbed engine w / a comp cam??
> I want to keep all the holes plugged and covered while I make a lot
> on dust
> and dirt
> working on the chassis.
>
> thanks,
> larry erd
> 77 kingley
> lake ashton, fl.
>
> PS; how do i know i have the proper quad jet carb??
_______________________________________________
GMCnet mailing list
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J.R. Wright
GMC GreatLaker
GMC Eastern States
GMCMI
78 30' Buskirk Stretch
75 Avion Under Reconstruction
Michigan
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| Re: [GMCnet] SPARK PLUGS [message #106291 is a reply to message #106290] |
Sat, 20 November 2010 13:11 |
larry erd
Messages: 132
Registered: August 2010
Karma: 0
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Senior Member |
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I love this group, you ask and you receive!!! Some times in just minutes.
Thanks
On Sat, Nov 20, 2010 at 2:03 PM, John Wright <powerjon@chartermi.net> wrote:
> See the following file:
>
> http://www.gmcmhphotos.com/photos/data/5237/Spark_Plug_Application_Gu.pdf
>
> It is a pdf file. You will have to open it.
>
> Couldn't find my list of carbs.
> Emory might have it.
>
> J.R. Wright
> GMC GreatLaker
> TZE Zone Restorations
> 77 Eleganza Custom (For Sale)
> 1975 Avion (Under Reconstruction)
> Michigan
>
> On Nov 20, 2010, at 1:56 PM, larry erd wrote:
>
> > Ok, my 403 is now rebuilt and it will be awhile before it is back in
> > the
> > coach,
> > what spark plugs do you recommend for a carbed engine w / a comp cam??
> > I want to keep all the holes plugged and covered while I make a lot
> > on dust
> > and dirt
> > working on the chassis.
> >
> > thanks,
> > larry erd
> > 77 kingley
> > lake ashton, fl.
> >
> > PS; how do i know i have the proper quad jet carb??
> _______________________________________________
> GMCnet mailing list
> List Information and Subscription Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
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| Re: [GMCnet] SPARK PLUGS [message #106293 is a reply to message #106290] |
Sat, 20 November 2010 13:23 |
emerystora
Messages: 4442
Registered: January 2004
Karma: 13
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Senior Member |
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Here you go:
GM used seven different carbs for the GMC motorhome. 73 and 74 years had a carb #7043254
75 and 76 and early 77 had 7045254 except for California emision carbs which were 7045554
77 coaches with the 403 engine had 17057254 and California 17057559
78 had 17058254 and California 1758559
These carb numbers can be found on the left side of the carb, stamped on the flat surface close to the secondary throttle shaft.
There is also a date code (4 digits) stamped in the same area. 73 to 76 coachs had a number starting with 70
77 & 78 carbs start with 170.
Some parts for these carbs are quite different on the 170 from the 70. DO NOT INTERCHANGE parts between these two series.
One example is the primary metering rods. They are .080" shorter in the 170 series, they had a different taper to the rods and these carbs used different sizes of primary jets.
The rods for the 70 series carbs will be stamped D-50. (7046338) I am told that this was used ONLY in the GMC motorhome carbs. The 170 series are different. All GMC carbs used the same secondary metering rods. These will be stamped with a CJ. The primary jets for the GMC at your elevation should be .070". (7031970)
The proper power spring for the GMC is #7036019 which has an operating range from 4" to 8" of vacuum.
One problem that some people have had is the use of gaskets from an unknown kit. There are changes in the air passages in the carbs and it is easy to install a gasket that covers an air passage hole and that will make the carb perform improperly.
The Delco overhaul kit for the 73-74 is 7046812. For the 75-76 (non Calif) it is 17051886
Emery
On Nov 20, 2010, at 12:03 PM, John Wright wrote:
> See the following file:
>
> http://www.gmcmhphotos.com/photos/data/5237/Spark_Plug_Application_Gu.pdf
>
> It is a pdf file. You will have to open it.
>
> Couldn't find my list of carbs.
> Emory might have it.
>
> J.R. Wright
> GMC GreatLaker
> TZE Zone Restorations
> 77 Eleganza Custom (For Sale)
> 1975 Avion (Under Reconstruction)
> Michigan
>
> On Nov 20, 2010, at 1:56 PM, larry erd wrote:
>
>> Ok, my 403 is now rebuilt and it will be awhile before it is back in
>> the
>> coach,
>> what spark plugs do you recommend for a carbed engine w / a comp cam??
>> I want to keep all the holes plugged and covered while I make a lot
>> on dust
>> and dirt
>> working on the chassis.
>>
>> thanks,
>> larry erd
>> 77 kingley
>> lake ashton, fl.
>>
>> PS; how do i know i have the proper quad jet carb??
> _______________________________________________
> GMCnet mailing list
> List Information and Subscription Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
_______________________________________________
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List Information and Subscription Options:
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| Re: [GMCnet] SPARK PLUGS [message #106295 is a reply to message #106291] |
Sat, 20 November 2010 13:40 |
powerjon
Messages: 2446
Registered: January 2004
Karma: 5
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Senior Member |
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If you're going to let it set for a while I would rap in a plastic bag
to keep the dirt and dust away.
J. R. Wright
GMC GreatLaker
TZE Zone Restorations
77 Eleganza Custom (For Sale)
1975 Avion (Under Reconstruction)
Michigan
On Nov 20, 2010, at 2:11 PM, larry erd wrote:
> I love this group, you ask and you receive!!! Some times in just
> minutes.
> Thanks
>
> On Sat, Nov 20, 2010 at 2:03 PM, John Wright
> <powerjon@chartermi.net> wrote:
>
>> See the following file:
>>
>> http://www.gmcmhphotos.com/photos/data/5237/Spark_Plug_Application_Gu.pdf
>>
>> It is a pdf file. You will have to open it.
>>
>> Couldn't find my list of carbs.
>> Emory might have it.
>>
>> J.R. Wright
>> GMC GreatLaker
>> TZE Zone Restorations
>> 77 Eleganza Custom (For Sale)
>> 1975 Avion (Under Reconstruction)
>> Michigan
>>
>> On Nov 20, 2010, at 1:56 PM, larry erd wrote:
>>
>>> Ok, my 403 is now rebuilt and it will be awhile before it is back in
>>> the
>>> coach,
>>> what spark plugs do you recommend for a carbed engine w / a comp
>>> cam??
>>> I want to keep all the holes plugged and covered while I make a lot
>>> on dust
>>> and dirt
>>> working on the chassis.
>>>
>>> thanks,
>>> larry erd
>>> 77 kingley
>>> lake ashton, fl.
>>>
>>> PS; how do i know i have the proper quad jet carb??
_______________________________________________
GMCnet mailing list
List Information and Subscription Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
J.R. Wright
GMC GreatLaker
GMC Eastern States
GMCMI
78 30' Buskirk Stretch
75 Avion Under Reconstruction
Michigan
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| Re: [GMCnet] SPARK PLUGS [message #106296 is a reply to message #106289] |
Sat, 20 November 2010 14:25 |
k2gkk
Messages: 4452
Registered: November 2009
Karma: -8
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Senior Member |
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Why not simply install your new plugs where they
will eventually reside (using a non-corrode on the
threads), put old sparkplug caps on them to keep
dirt and moisture off them, and hook them back up
when ready to go?
K.I.S.
* "An unarmed man can but flee *
* from evil. Evil can NEVER be *
* overcome by flight FROM it." *
* * * * * * * * * * * *
* D C "Mac" Macdonald *
* Amateur Radio K2GKK *
* USAF & FAA, Retired *
** Oklahoma City, OK **
* * "The Money Pit" * *
* * ex-Palm Beach, 76 *
* * * * * * * * * * * *
---- Original Message ----
Date: Sat, 20 Nov 2010 13:56:59 -0500
From: 1ljerd@gmail.com
To: gmclist@temp.gmcnet.org
Subject: [GMCnet] SPARK PLUGS
Ok, my 403 is now rebuilt and it will be awhile before
it is back in the coach,
what spark plugs do you recommend for a carbed engine
w / a comp cam??
I want to keep all the holes plugged and covered while
I make a lot on dust and dirt working on the chassis.
thanks,
larry erd
77 kingley
lake ashton, fl.
PS; how do i know i have the proper quad jet carb??
_______________________________________________
GMCnet mailing list
List Information and Subscription Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
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| comp cam [message #106297 is a reply to message #106289] |
Sat, 20 November 2010 14:32 |
bukzin
Messages: 840
Registered: April 2004
Location: North California
Karma: 0
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Senior Member |
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[quote title=larry erd wrote on Sat, 20 November 2010 10:56]Ok, my 403 is now rebuilt and it will be awhile before it is back in the
coach,
what spark plugs do you recommend for a carbed engine w / a comp cam??
I want to keep all the holes plugged and covered while I make a lot on dust
and dirt
working on the chassis.
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
What is a 'comp cam' ?
Bukzin
1977 Palm Beach
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| Re: [GMCnet] comp cam [message #106303 is a reply to message #106297] |
Sat, 20 November 2010 15:55 |
powerjon
Messages: 2446
Registered: January 2004
Karma: 5
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Senior Member |
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Refers to a camshaft made by Comp Cams.
See:
http://www.compperformancegroupstores.com/store/merchant.mvc?Screen=CTGY&Store_Code=CC&Category_Code=OldsCams
http://tinyurl.com/278qpru
Also produced Jim B's "kryptonite" cam using his design for his
motors that he builds.
JR Wright
On Nov 20, 2010, at 3:32 PM, Richard wrote:
>
>
> [quote title=larry erd wrote on Sat, 20 November 2010 10:56]Ok, my
> 403 is now rebuilt and it will be awhile before it is back in the
> coach,
> what spark plugs do you recommend for a carbed engine w / a comp cam??
> I want to keep all the holes plugged and covered while I make a lot
> on dust
> and dirt
> working on the chassis.
> ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
>
> What is a 'comp cam' ?
> --
> Bukzin
> 1977 Palm Beach
> Chico California
> __________________
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GMCnet mailing list
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J.R. Wright
GMC GreatLaker
GMC Eastern States
GMCMI
78 30' Buskirk Stretch
75 Avion Under Reconstruction
Michigan
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| Re: [GMCnet] SPARK PLUGS [message #106305 is a reply to message #106289] |
Sat, 20 November 2010 16:10 |
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larry erd wrote on Sat, 20 November 2010 10:56]Ok, my 403
what spark plugs do you recommend for a carbed engine w / a comp cam??
thanks,
larry erd
77 kingley
lake ashton, fl.
Hi Larry, I spoke to Dave Paterson a few days ago, as I had purchased one of his LS distributors for my '73. He said that the mfg. of the #7 has changed and he does not prefer them anymore. My friend in CC runs a NGK XR45858 in his boat 455. I put them in mine and it runs very well. Dave says that's OK and to gap them at .037.
geo groth '73 260 Sequoia
Carson City Nevada 89703
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| Re: [GMCnet] SPARK PLUGS [message #106339 is a reply to message #106289] |
Sun, 21 November 2010 10:33 |
tgeiger
Messages: 518
Registered: February 2006
Location: kansas city
Karma: -1
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Senior Member |
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I was considering replaceing my plugs next season...anyone know anything of these new E3 spark plugs?? A little expensive but are suppose to produce a better burn.
Tom Geiger
76 Eleganza II
KCMO
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| Re: [GMCnet] SPARK PLUGS [message #106352 is a reply to message #106340] |
Sun, 21 November 2010 12:25 |
powerjon
Messages: 2446
Registered: January 2004
Karma: 5
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Senior Member |
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The E3 plug has been accused of using snake oil to get some of the
figures that they claim on their website. First of all I am not
knocking the E3 plug, but I never believe the manufactures claims on
items like this. Their has been numerous independent tests using
the E3 plug with differing results and you can find them online. All
in all IMHO the E3 plug is maybe marginally better than most plugs
that we use in our MH today. It is somewhat more expensive than most
plugs with a price range of $6.99 to $4.99. Jegs carry the plugs for
$5.99. Looked at E3's online cross-reference list and it appears
that we would use the E3.52 plug or our motors. Again MHO is that
your might get improved mileage and more power, but will it be enough
to offset the increased cost of the plugs over there lifespan? The
choice is yours.
J. R. Wright
GMC GreatLaker
TZE Zone Restorations
77 Eleganza Custom (For Sale)
1975 Avion (Under Reconstruction)
Michigan
>
>
> sorry guys, meant to give a link to these.
> look at the video section of their web site.
>
> http://www.e3sparkplugstv.com/featured_landing.php?reset=true
_______________________________________________
GMCnet mailing list
List Information and Subscription Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
J.R. Wright
GMC GreatLaker
GMC Eastern States
GMCMI
78 30' Buskirk Stretch
75 Avion Under Reconstruction
Michigan
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| Re: [GMCnet] SPARK PLUGS [message #106360 is a reply to message #106353] |
Sun, 21 November 2010 13:49 |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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Senior Member |
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Many years ago, my father in law who was a graduate of Adcocks Diesel School
in Portland, Or. (Both are long since deceased), was reading a J.C. Whitney
catalog and saw all those claims for improved horsepower and fuel mileage
improvement offered within their grand and illustrated publication. On a
whim, he fired off an order for everything that would make such a claim,
reasoning that he should have to stop his car every so often to remove the
excess gasoline from the tank. Needless to say that didn't prove out to be
much of a problem, but it sure made some interesting looks when he raised
the hood on his car to display all that stuff to his friends & family. As I
recall, he became somewhat more skeptical of advertisement claims after
that. I still get amused when thinking back to those times. Live & learn &
enjoy the journey. Life is a trip with a great view if we stop now and then
to enjoy it. Have a great Sunday out there and hug your family and polish a
little dust off that GMC.
Jim Hupy
Salem, Or
78 Royale 403
On Sun, Nov 21, 2010 at 10:33 AM, Rob Mueller <robmueller@iinet.net.au>wrote:
> Tom,
>
> One question:
>
> If these spark plugs were so great why didn't they show a Dyno run with
> brand X spark plugs and then with E3's?
>
> They show a chart with two sets of lines but don't say what they represent!
>
> Looks like snake oil to me!
>
> Regards,
> Rob M.
> USAussie
>
> -----Original Message-----
> From: gmclist-bounces@temp.gmcnet.org
> [mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of tom geiger
> Sent: Sunday, November 21, 2010 10:40 AM
> To: gmclist@temp.gmcnet.org
> Subject: Re: [GMCnet] SPARK PLUGS
>
>
>
> sorry guys, meant to give a link to these.
> look at the video section of their web site.
>
> http://www.e3sparkplugstv.com/featured_landing.php?reset=true
> _______________________________________________
> GMCnet mailing list
> List Information and Subscription Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
> _______________________________________________
> GMCnet mailing list
> List Information and Subscription Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
_______________________________________________
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| Re: [GMCnet] SPARK PLUGS [message #106372 is a reply to message #106339] |
Sun, 21 November 2010 15:37 |
midlf
Messages: 2212
Registered: July 2007
Location: SE Wisc. (Palmyra)
Karma: 1
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Senior Member |
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| tgeiger wrote on Sun, 21 November 2010 10:33 |
I was considering replacing my plugs next season...anyone know anything of these new E3 spark plugs?? A little expensive but are suppose to produce a better burn.
|
I generally run on the principal that if an item or device is as effective as claimed then the OEM's would be buying it or incorporating it into their product. With the pressure on corporate MPG I believe anything that could get a MPG increase, that would be truly noticeable to the consumer, is being used or has been incorporated.
Thus, for me, the real question is, "What OEM is installing E3 spark plugs?" If one was, I'm sure E3 would have made it known in their advertising.
Steve Southworth
1974 Glacier TZE064V100150 (for workin on)
1975 Transmode TZE365V100394 (parts & spares)
Palmyra WI
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| Re: [GMCnet] SPARK PLUGS [message #106381 is a reply to message #106289] |
Sun, 21 November 2010 17:19 |
C Boyd
Messages: 2629
Registered: April 2006
Karma: 18
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Senior Member |
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I am seriously considering finding a cross over # for Split Fires. They have a forked electrode that throws 2 sparks at the same time. I know that my Hot Rod Harley really likes them. I can tell a difference in the starting, idle and acceleration. It hits a harder lick and starts on the first roll over.
C. Boyd
76 Crestmont
East Tennessee
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| Re: [GMCnet] SPARK PLUGS [message #106400 is a reply to message #106289] |
Sun, 21 November 2010 20:04 |
Bob Horton
Messages: 81
Registered: December 2005
Location: Brandon, Manitoba, Canada
Karma: 0
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Member |
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Emery wrote
"Dick Paterson doesn't recommend the #7 anymore."
Guess you can't count on anything anymore??? Maybe they are made in China now like everything else.
Bob Horton
Brandon, Manitoba
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