Quote:
Originally Posted by ACHiPo
I can get Sunoco gas at the Andrade gas station, but that's not what I want. I want a motor that is happy slurping 91 octane from Chevron, Shell, etc. Perhaps I need to consider 9:1 compression ratio?
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That's for you and your engine builder to figure out. Lots of variables, including timing and spark plug heat range. If you're not worried about max HP and just a DD, and want to use straight 91 gas, then definitely go lower than higher. I mix to be safe, but I think around 10:1 +/-. Not sure, I'd have to recheck my paperwork.