Quote:
Originally Posted by Rlhay2
Run them at OEM AFR levels (very rich) and the unburnt fuel should help keep them from overheating.
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Yes, however its not the unburnt fuel, its the fact the cylinder temperatures are cooler with more fuel meaning cooler exhaust.
Quote:
Originally Posted by staples87
It's actually the opposite. The richer the fuel, the more the cat has to work. In turn that's going to generate more heat, clog them and take them out.
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Not correct at all. Exhaust temps are higher when running lean, and cooler when running rich. Creating a better environment for cats.
With half mile and mile racing you will run a more rich AFR to keep cylinder temps down and hopefully prevent detonation to to high cylinder temps, in turn mean cooler exhaust temps as well. Again a better environment for the cats.