That's would be a close call. Others would be more experienced with this than I am, but I'm not sure if pump gas would be enough for 11:1.
That's would be a close call. Others would be more experienced with this than I am, but I'm not sure if pump gas would be enough for 11:1.
I don't know compression ratio vs octane requirements that well, but my Lexus is 10:1 and calls for 90+ octane, a ton of 9:1 engines run on 87 fine (maybe all?). I suspect around 11:1 would be around 93 octane. Doesn't hurt to go a little higher than needed, but being too low is bad.
I'm sure there's someone with a lot more experience than me that would have a better answer.
FYI, I can run my Lexus on 87 octane pump gas, but the ignition timing is pulled. I can feel the response isn't quite as crisp and fast. I get a lot better MPG with 90+ octane, but economics $$$ per mile, the 87 is the best value in my case. It's a v8 rwd big heavy car... yes Japanese car with a Japanese V8 that's designed for Americans with the traditional 90 degree V8 layout but DOHC + high compression + ultra smooth balancing. The ignition system legit is 2x 4cyl igniters (modules), two distributors (one on each cam), two coils. You can get an ignition problem and still drive home on the 4 cyls that still run.
thnks for the imput!
would a domed 10.25 piston provide more low end torque?
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