I remember my old auto/body shop teacher used to say to use hotter plugs for short-trip, around town driving and colder plugs for extended freeway driving. I'm doing mostly short-trip around town driving w/my '91' XJ now and have noticed a gas mileage drop, would going to hotter plugs make any difference? Would the engine get up to operating temp faster w/hotter plugs?
-Bill (remove "botizer" to reply via email)
Use only the recommended plug. Going to a hotter plug without some investigation of what would work first could result in serious piston damage... as in burnt holes in the piston tops.
Jerry
You're killin' me, Bill:) Can't I get a little somethin' for the approximate operating temperature of a spark plug? Nice motor, though. "Using a Merlin II block and Dart's famed Big Chief cylinder heads, the big- block of your dreams is only a checkbook away." So true... Jim P.S. I'll have to send you a photo of the motor when it's all done.
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