Cold cranking compression specification??

Posted by Jack Vines On 2014/12/12 1:10:38

The only published figure I have is:

Cranking compression 120 lbs/sq in(54.43 kg/cm) min. at 150 rpm.

Since that's a ridiculously low number, I'm guessing it could be for the 7.5 to 1 Hash engines. Even an 8.5 to 1 should have at least 140 PSI. The 9.5s around 150 and I'd expect to see the 10 to 1 374" blowing at least 165 PSI.

Anyone have any other published cranking compression numbers?

jack vines