Quote:
Originally Posted by Black 993
Henry do you think one could run a single-plug 2.4 at 9.9:1 compression on California 91 pump gas? Maybe a little less compression just to be on the safe side? I've got a 2.2T built to S specs with the Mahle p/c's and have started thinking about using the 2.7 crank/rods and a modern cam like Mod-S for a power upgrade. Probably wouldn't go there if it meant having to twin plug it though. Thanks for any guidance.
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9.9 on Cali street gas is marginal as a single plug. The issue is heat. If the heads get hot, it will detonate unless ignition timing is severely restricted.
Rich mixture, retarded timing and easy throttle trough maximum torque can mitigate the issue.
Edit: sometimes you can mitigate detonation by simply changing to a cooler spark plug.