anyone running high cr on pump gas here in california and not having any problems with pinging or detonation or should i get a thick ass gasket and try to bring it down a little?
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Depends on the engine and engine management. A stock E36 with an M52B28 runs at 10.5:1 on 91 gas. -
There is a pretty elevated brain trust operating here - please provide more info and I bet you will get some better feedback. What are you running? Engine type, fuel management, chip, induction, cam, and etc.Comment
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Honestly this would be better asked in the engine subforum, not the CA subforum. "California gas" isn't the issue here.Comment
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m52b28 crank 130mm rods 10:4 OEM bmw pistons with the I style quench zonesComment
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Yeah, this is an "m20" question, not a "California" question. Putting it in the correct location would get ForcedFirebird or Digger to give you an answer (or tell you to search).
M20 section: https://www.r3vlimited.com/board/for...drivetrain/m20
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1987 - 325i Convertible Delphin Auto [SOLD], 325i Convertible Delphin Manual [SOLD]
1989 - 325i Convertible Bronzit m30b35 swapped [SCRAPPED], 325i Sedan Alpine Auto[DD]
1991 - 325i Coupe Laguna Manual [Project], 535i Sedan Alpine [SCRAPPED]Comment
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The 2.1L M42 that Metric Mechanic built me has static compression of 11.5:1. I run it on 91 octane pump gas and have had zero pinging after years of revving it up to 7500RPM. This was the case both with a bone stock M42 tune, and a very much optimized custom tune from Sssquid. The compression ratio and gas are probably secondary factors after your ignition timing and fuel trims.Comment
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Forced Fire bird is the one building my engineComment
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