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Old 04-19-2014, 07:00 PM   #1
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Default Spark plug heat rating?

My car runs a 40 thou skimmed head and about 20 degrees advance i think. It was mapped a while back and I've removed the plugs recently and they are white. A friend suggested that this means they are getting too hot and that I should change to a higher heat related plug?

I see mx5 parts do BKR6E-11 (which it already has in it) and the BKR7E-11.

I take it I want the 7E's?
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Old 04-19-2014, 10:39 PM   #2
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General rule of thumb. 6 for NA, 7 for forced induction.
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Old 04-20-2014, 05:22 AM   #3
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So I can just leave mine turning white?

I thought if they went white that meant they were getting too hot?
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Old 04-20-2014, 12:41 PM   #4
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White = lean, check injectors... or fuel map if you have a standalone

Are they threaded in correctly with torque spec ?
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Old 04-20-2014, 01:58 PM   #5
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It's on megasquirt and has recently been mapped.

I have no idea about that sort of stuff I drop it off to be mapped then pick it up done.

On the dyno printout it's AFRs looked ok but it does run a lot of timing advance so maybe that's it. It's back down for a map check next month I'll met
Nation it maybe being lean then
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Old 04-21-2014, 01:14 AM   #6
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Higher number is colder plug.
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Old 04-21-2014, 09:36 PM   #7
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Buy a wideband. Reading spark plugs is archaic and difficult to actually do correctly.
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