| Re: [GMCnet] spark plug gap [message #310676 is a reply to message #310675] |
Sun, 20 November 2016 16:36   |
powerjon
Messages: 2446
Registered: January 2004
Karma:
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Senior Member |
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I put together a spark plug guide that is available here or it is also in the GMCMI parts interchange.
http://www.gmcmhphotos.com/photos/data/5237/Spark_Plug_Application_Guide.pdf
JR Wright
GMC Great Laker MHC
GMC Eastern States Charter Member
GMCGL Tech Editor
GMCMI
78 GMC Buskirk 30’ Stretch
1975 GMC Avion (Under Reconstruction)
Michigan
> On Nov 20, 2016, at 4:58 PM, Ray Erspamer wrote:
>
> This could be why I've had 2 ignition modules fail in the last 4
> years. My plugs are gapped at .060.
>
> Great info, thanks!
>
> On Sun, Nov 20, 2016 at 2:49 PM, Matt Colie wrote:
>> Len Novak wrote on Sun, 20 November 2016 13:17
>>> Gents,
>>>
>>> 1978 GMC, 403, Delco R46SZ
>>>
>>> The air cleaner says .060, but I hear that may be too wide.
>>
>> Len,
>>
>> That is because in tests run in the early 70's it was discovered that wide gaps and hot sparks reduced misfire and therefore HC emissions.
>> But the fact became clear shortly after the release of the HEI that 0.060 was too much for the hardware. OOPS
>>
>> Gap is really important to over all performance, but too wide can be tough on the systems unless they are built up from OE.
>>
>> Matt
>> --
>> Matt & Mary Colie - Members GMCMI, GMCGL, GMCES
>> '73 Glacier 23 - Still Loving OE Rear Drum Brake with Applied Control Arms
>> Now with both true Keyless and remote entry
>> SE Michigan - Twixt A2 and Detroit
>>
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>
>
>
> --
> Ray Erspamer
> 78 Royale - "The Great Lakes Eagle"
> Center Kitchen TZE368V101144
> Wauwatosa, Wisconsin 53226
> Email: 78GMCRoyale@gmail.com
> 414-484-9431
> Web Site: http://ray-lisa.page.tl/
>
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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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