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FE Power Forums => FE Technical Forum => Topic started by: galaxastang on February 19, 2013, 07:52:17 PM

Title: compression ratio
Post by: galaxastang on February 19, 2013, 07:52:17 PM

67 390 stock rebuild .30 over, 9 to 1 ? Are there any calculators out there or would factory specs be close? Thanks

Title: Re: compression ratio
Post by: ScotiaFE on February 20, 2013, 11:03:37 AM

There are lots of calculators for compression ratio, but they all require the exact
measurements of the engine to give you an accurate number.
You can guess on a few, but it is just a guess.
The piston is the biggest factor.
Most 67 390's where in the 10.5 to 1 range.
For the most info you would have to give all the specs you can for your engine.

Here's a whole pile of configulators.

http://www.wallaceracing.com/Calculators.htm