In article XnsA744ACBF6BA53pogosupernews@
46.165.242.91, says...

"J. Clarke" wrote in
:

In article XnsA744769601979pogosupernews@
46.165.242.91, says...

The turbo Offys didn't, but the engine was originally
designed for dirt track (sprint) cars, and those
engines ran on pump gas, as did the original Indy
Offys. By the time turbos came in, gasoline had been
banned at Indy for safety reasons, and all the engines
ran on methanol.

So were the "sprint car Offys" running that 15:1
compression that was mentioned as one of the
characteristics of the high output engine that
was mentioned?

Not sure what relevance that has to anything, but
no, those engines would have been around 10:1.
Bearing in mind that this was late 30's to early
50's, and production car engines would have been
6:1 or less. (also bearing in mind that Offys
were built to order, and they would happily
make any compression ratio you wanted).

John

Since the mention of Offenhausers was in the
context of power per cubic inch on pump gasoline
and the example used was an Offy with 15:1
compression it's very relevant that the example
did not run on pump gas.