| Re: [GMCnet] spark plug gap [message #310675 is a reply to message #310668] |
Sun, 20 November 2016 15:58   |
Ray Erspamer
Messages: 1707
Registered: May 2007
Location: Milwaukee Wisconsin
Karma:
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Senior Member |
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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 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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