A performance engine generally requires a colder plug. EG once you bolt up
that supercharger you just purchased and the engine produces a lot more power
you may need to fit a colder (also known as harder) plug. The down side to
colder plugs is that because they literally run colder they tend not to work
as well in low rpm usage when the engine is not working hard and can thus
suffer from excess deposits or get a bit wet (oily?) in slow city traffic
type driving. That said, a sports coil usually restores the status quo.
Yes, Champion and NGK do number heat ranges in opposite directions - not
sure about Bosch and others.
I think you have Vizard and other books that have some A-series specific data
in them.
Daniel1312
In a message dated 20/09/00 19:16:07 GMT Daylight Time,
rob@thomasr.greatxscape.net writes:
<< Suffering from a bit of confusion here. Do 'hotter' plugs work better for
an engine that requires a higher heat range or does 'hotter' relate to the
fact that the engine runs hotter and thus the plugs would seem too hot in a
standard engine. I know I haven't posed the question very clearly, but I'm
suffering from early signs of dementia over this.
Now, as to the way the plug heat ranges are marked.....are the numbers (eg
N9, BP6 etc ) ordered in the opposite ways for NGK and Champion plugs?
Which ones are equals? If your car gets carbon build up on an otherwise
correct engine (ignoring any other cause of carbon deposits :o} ), would
you go for a 'colder' plug to get more heat build-up on the electrode or a
'hotter' one?
Yours sincerely,
Confused of Cymru.
>>
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