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| Re: [GMCnet] spark plug gap [message #310683 is a reply to message #310676] |
Sun, 20 November 2016 18:17   |
Ray Erspamer
Messages: 1707
Registered: May 2007
Location: Milwaukee Wisconsin
Karma:
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Senior Member |
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Great info John, thank you.
On Sun, Nov 20, 2016 at 4:36 PM, John Wright wrote:
> 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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--
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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Ray Erspamer
78 GMC Royale Center Kitchen
403, 3.70 Final Drive
Holley Sniper Quadrajet EFI System,
Holley Hyperspark Ignition System
414-484-9431
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