Technical > Spud Miller's Cave

Spark plugs for blown combo

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ricardo1967:

--- Quote from: dreracecar on July 31, 2014, 03:45:21 PM ---... The easiest way to read a NGK plug is to count the number of threads that the iridite is burned off, 3 threads is safe 4 is on the edge...

--- End quote ---

Bruce, I've heard about this method before, can you say more? I assume it would work only once? Once the three or four threads are burned off, can you still read thread counts, for example, if you run richer again?

dreracecar:
Once the plating is gone to 4 its useless to get another reading, but the plug is still good.
Again I tune to an index, Tuning a 6.80 car up/down to a 7.00 leaves me on the fat side so my plugs dont see even 3 threads discolored.

ricardo1967:
Thanks Bruce! Yes, that what I imagined, the plug is still good, but no longer readable (on the colder side).

masracingtd1167:
Try Wallace racing calculators

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