Heat Range of Spark Plugs
I think BP (non-projected) is a half step colder than projected BPR.
So BPR7 -> BP7 -> BPR8 -> BP8 etc..
But i also think most people would agree than projected plug works better in 4G63 (stock plug is projected as well). It lights up the mixture in a more optimal spot, which requires less flame travel, which obviously is good (technically and theoretically it would mean it provides a smaller MBT)
So BPR7 -> BP7 -> BPR8 -> BP8 etc..
But i also think most people would agree than projected plug works better in 4G63 (stock plug is projected as well). It lights up the mixture in a more optimal spot, which requires less flame travel, which obviously is good (technically and theoretically it would mean it provides a smaller MBT)
Last edited by mplspilot; May 27, 2008 at 01:46 PM.
I think BP (non-projected) is a half step colder than projected BPR.
So BPR7 -> BP7 -> BPR8 -> BP8 etc..
But i also think most people would agree than projected plug works better in 4G63 (stock plug is projected as well). It lights up the mixture in a more optimal spot, which requires less flame travel, which obviously is good (technically and theoretically it would mean it provides a smaller MBT)
So BPR7 -> BP7 -> BPR8 -> BP8 etc..
But i also think most people would agree than projected plug works better in 4G63 (stock plug is projected as well). It lights up the mixture in a more optimal spot, which requires less flame travel, which obviously is good (technically and theoretically it would mean it provides a smaller MBT)
R= Resistor
So it would be BPR7 -> BR7 -> BPR8 -> BR8 etc...
P and R they look alike 
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