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engine building tips and specs this is not a ... in presenting the parts modifying an engine be it a complete assembly or a bare ... at all possible consult an experienced engine builder you may find it to your ... ratio cr is often one of the first engine performance modifications squeezing the ... which heat is extracted from the fuel engineers call it thermal efficiency simply put ... t has a cr of 3.6:1 high-performance engines operate in the area of 12.5:1 most of ... today s stock production engines are about 8.5:1 note turbocharged ... engines typically have a lower cr than normally ... aspirated engines thus if you add a turbo you may want to lower the cr depending ... increasing the cr requires gasoline with a high octane rating with anti-knock ... detonation this is not a problem with engines that burn alcohol because it has a ...