Colder Plugs & Smaller Gaps

65coupei6

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Just doing some research. I have read you should switch to a colder plug when adding a turbo, nitrous or a supercharger.

Also closing the gap because as the boost increases, smaller plug gaps are required to prevent spark blow-out.

True?
 

pmuller9

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Just doing some research. I have read you should switch to a colder plug when adding a turbo, nitrous or a supercharger.

Also closing the gap because as the boost increases, smaller plug gaps are required to prevent spark blow-out.

True?
True.
As cylinder pressure increases the resistance between the plug gap increases.
 
Last edited:

pmuller9

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Supporter 2018
Supporter 2021
The smallest gap we ran was .025” with 35 lbs boosted methanol.
What type of project are you looking at?
 

65coupei6

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Supercharger. Looking at 6-8 of boost. Running with a FiTech. I was thinking .035 gap?
 
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