Re: Spark Plug reach-why not use longer?
Regardless of the heat range, you should always use the correct reach spark plug that is recommended by the manufacturer of the specific engine. Besides putting a hole in the top of the piston possibly, there are other reasons the cylinder head is threaded for a particular reach plug.
You'll more than likely get poorer combustion than recieve any benifits of higher compression using a longer reach plug.......too short of reach plug is a definite no-no on the other hand.
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costs nothing, why don't people use them more often?
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Last edited by scotto-; 01-08-2012 at 02:33 AM.