Originally Posted by fischer550
Would a hotter range plug run better than a colder range? I am curious why exactly you choose the 6 over the 8, runs better?
I dont know if it runs better or not, I've never run the cooler range plugs.
One thing that needs to be understood about a plugs heat range difference is that the heat range has nothing to do with how hot or strong the spark is, Each plug fires the exact same spark, it actually has to do with how hot the plug itself runs since the porcelain in the hotter plug is narrower inside plug body and allows gases and compression to happen farther up into the spark plug itself while a colder running plug does just the opposite.
On my old hot rods I would always run a. Cold plug and a hot coil since they were high compression engines for the street, to hot of a plug increases detonation/preignition problems sometimes.
In very hot conditions with a china girl that is very high compression the colder plug may be the best option.