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Higher Compression motors and spark plug needs.

Higher Compression motors and spark plug needs.

Higher Compression motors and spark plug needs.

(OP)
Back to raising the compression ratio thing again..lol

Is there a "stock" guideline one would adhear to when raising the compression ratio (8.5:1 to 10.5:1) in regard to heat range and electrode gap?

Thanks again!

RE: Higher Compression motors and spark plug needs.

The basic "rule of them" is to go slightly colder and use a slightly smaller gap, but there are many variables.  Just remember to err on the cold side, because too-hot plugs can be much worse($$$$)than the nusiance that too-cold plugs are.

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