Spark Plug Gap
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#11
TECH Senior Member
iTrader: (42)
I change mine every 10,000-12,000 miles and only when I bumped the compression up to 11.5 did I switch to the TR6 ... I gap them at .050 and they look good before that with the stock compression I ran the TR55 plugs at .055 and they always looked good ... we all have our own poison so to speak ... after 189,000+ miles I have a pretty good feel for what works on this motor.
#15
10 Second Club
iTrader: (18)
General rule of thumb is when you increase base horsepower by ~100 it's time to go a step colder on the plug. Also, when increased cylinder pressure and/or temps are present, like high compression, or nitrous, it is also very advisable.
A lot of people want to keep the hotter plug because they think they will make more power, and this is just not the case.
A lot of people want to keep the hotter plug because they think they will make more power, and this is just not the case.