PLUG GAP
#2
Senior Member
RACING JUNKIE
Join Date: May 2006
Posts: 2,044
The wider the gap the more resistance and the harder the ignition has to work to fire the plug.
A smaller or narrower gap will actually have a fatter spark kernel than a plug gapped wider.
On high compression motors on gas I run between .028 .032
Cp
A smaller or narrower gap will actually have a fatter spark kernel than a plug gapped wider.
On high compression motors on gas I run between .028 .032
Cp
#3
Senior Member
DYNO OPERATOR
Thread Starter
Join Date: Apr 2008
Posts: 496
Originally Posted by cepx111
The wider the gap the more resistance and the harder the ignition has to work to fire the plug.
A smaller or narrower gap will actually have a fatter spark kernel than a plug gapped wider.
On high compression motors on gas I run between .028 .032
Cp
A smaller or narrower gap will actually have a fatter spark kernel than a plug gapped wider.
On high compression motors on gas I run between .028 .032
Cp
#6
Senior Member
RACING JUNKIE
Join Date: Jan 2006
Location: La.
Posts: 2,890
I run NGK 8's or 9's with gas or alcohol, if i'm running the V-gaps i set them at .022, gas or alcohol, if i'm running the ES version (flat tip) i set them at .025. All use MSD ignition. In my opinion .045 is way out of range. I know that the old HEI setups GM called for .040/.045, but with multi-spark-discharge aka MSD you'll get much better firing of fuel charge setting them at less than .030.
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#9
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Thread Starter
Join Date: Apr 2008
Posts: 496
Originally Posted by zipper06
I run NGK 8's or 9's with gas or alcohol, if i'm running the V-gaps i set them at .022, gas or alcohol, if i'm running the ES version (flat tip) i set them at .025. All use MSD ignition. In my opinion .045 is way out of range. I know that the old HEI setups GM called for .040/.045, but with multi-spark-discharge aka MSD you'll get much better firing of fuel charge setting them at less than .030.
DO YOU THINK NGK 7'S ARE TO HOT?
JMO
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DO YOU THINK NGK 7'S ARE TO HOT?
JMO
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#10
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RACING JUNKIE
Join Date: Jan 2006
Location: La.
Posts: 2,890
I think the 7's are more of a street application on pump gas. i run NGK 8's in my 377" on alcohol, and we run ES8's with a pump gas 468 b/blk shooting 200 shot of nitrous. I run NGK 9's in my blown alcohol sm/blk. I think the 8's would be better for your engine.
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JMO
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