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Originally posted by A380Driver
I know that the FSM recommends the 5B's as the standard and the 6 and 7B's for the alternative plugs.
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Early in 1993 (I think) there was a Technical Service Bulletin that changed the standard plug for SR20DE engines to "6".
5 & 7 were the alternatives.
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Do you think this would matter of the heat range of the plug based on what kind of climate you are in?
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Generally No.
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Or is it basically how much more power you a running than stock and you need to go to a cooler plug.
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Yes.
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Would also going to a 6 be better for the engine or would that reduce performance?
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Yes it would be better and No it will not reduce performance.
Chris
(who assumes we are talking about an SR20DE engine).