Re: Vaporizing gas fix

Posted by Rusty O\'Toole On 2010/8/12 23:20:49

Denny the compression ratio of a 1942 Packard Eight, all models, is 6.85:1 according to my 1952 Canadian Service Data Book.

Turning to the 1954 edition a 327 could be 7 or 8:1 depending on model.

"So then, if the modern gasoline/octane/ethonol ratings present a problem with higher compression VINTAGE engines then why do MODERN high compression engines not display the same problems????"

Who says they don't? New cars may get away with a little higher compression than 50s cars due to improved combustion chamber shape, better spark advance mapping, fuel injection, being optimized for today's gas, and possibly other factors. There is such a thing as progress after all. But I don't believe the difference is huge.