As the meth cars run high CR's with big boost on top, (I searched and found a 1.8-liter Honda running 13.8:1 with 35lbs. on top), I'm now wondering if a higher CR would be benefical on an ethanol fueled car running up to about 25psi?
Ethanol is technically alcohol and has a serious cooling ability,just like methanol,so given that E85 likes about 8:1 AFR (Meth 5:1(?) and gas 12:5.1) would a CR in-between the low 7:1 for gas and the high 13+:1 for meth be benefical? Like 10:1 or so?
Opinions welcome...verbal bashing is not. (I've had a hard day)
CR with E85 on boost?
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It's a street/strip Volvo 850,with bias to street use,I reckon 80% so. Being a 600hp+ FWD drivability is an issue... And,we're trying to get the most hp with the least boost,so we'll try to stay below 22 psi... The "norm" here is (for gas) 8:1 or less and 30+ psi boost,we're trying to go for higher static CR due to fairly long cams (high rpm) and restrict the boost somewhat. I'm just curious if close to 10:1 would be considered high with regard to the fuel. I know 10:1 on gas with boost on top is pushing it,but I'm not sure how the ethanol reacts..
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Re: CR with E85 on boost?
Seen 11-11.5:1 work ok. Most run 10.5-11 ish.
Lsx 10.8:1 with 30 lbs boost went 7.17 at 197 at 3280 lbs
My bbc is 10:1 on 19psi so far its Around 1600 whp
Lsx 10.8:1 with 30 lbs boost went 7.17 at 197 at 3280 lbs
My bbc is 10:1 on 19psi so far its Around 1600 whp