This is a low cranking compression, especially when you compare it to engines like the ZZ4 350ci/345hp crate engine that makes around 190 psi or the current HT 383 with 9.1:1 compression and a big ...

A compression test reveals the condition of your engine's valves, its valve seats, and piston rings and whether these parts are wearing evenly. Healthy engines should have compression over 100 psi ...

Compression Ratio = Absolute discharge pressure/Absolute suction pressure Most technicians realize their service gauges read zero when not connected to a system, even though there is a pressure of ...

I didn't check the cranking pressure, but my guess is that with 10:1 static compression, it will be around 195 psi. Let's dive a little deeper into the relationship of cam timing to compression.

One reason for its success, other than the cylinder heads, VCT, and intake, is the bump in compression ratio from 9.4:1 on the '99-'04 GT to 9.8:1. Our plan was to take one engine and test it with ...