Quote:
Originally Posted by Tommy
BTW, I've long thought that reading plugs only tells you what was happening in the last few seconds before the engine was shut off (i.e., the low speed cruise through my neighborhood and into my driveway). Was I wrong?
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That is exactly right, you only really know what went on over the last few minutes. Drag racers will shut the engine down at the end of the run, and then get towed back to the pits. But you can get a pretty good idea of heat range by looking at the strap and the threads.
Also, with modern fuels and oils, reading the plugs doesn't tell you nearly as much as it did in the olden days.