spark plug gap?
07-06-2010, 01:01 PM
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spark plug gap? my buddy bought a camaro with a high compression 383 (we think 12.3 to 1) and he had an msd digital 6 box on it. it also came with papers and msd recomends a .040-.050 gap on the plugs for best performance. now when i pulled his plugs and checked gap it was at .026- .028. so my question is, what ill effects did the tight gap have on performance and posible damage?
07-06-2010, 09:27 PM
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What plugs are you running? You'll want to run something heat range 6-7 with a gap of about .035-.038. Rule of thumb is on NA you need to close the gap .004 for every 50 HP over stock. One heat range colder than something like a TR55 with compression that high, maybe an additional heat range colder (to 7) than that on nitrous. Heat range 6 is probably fine as long as you're using a recessed tip plug. .026-.028 is probably a little too tight. Ray at nitrous outlet is a good resource for finding a 'close as possible' spec for plug and gap. It depends on how much and how often you spray...
07-06-2010, 09:48 PM
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What plugs are you running? You'll want to run something heat range 6-7 with a gap of about .035-.038. Rule of thumb is on NA you need to close the gap .004 for every 50 HP over stock. One heat range colder than something like a TR55 with compression that high, maybe an additional heat range colder (to 7) than that on nitrous. Heat range 6 is probably fine as long as you're using a recessed tip plug. .026-.028 is probably a little too tight. Ray at nitrous outlet is a good resource for finding a 'close as possible' spec for plug and gap. It depends on how much and how often you spray...
