Re: No knock despite 18 psi and 15 degrees advanced - Saab Performance Bulletin Board - Saabnet.com
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Re: No knock despite 18 psi and 15 degrees advanced
Posted by Steven Pfaff [Email] (more from Steven Pfaff) on Wed, 3 Mar 2010 08:15:25
In Reply to: Re: No knock despite 18 psi and 15 degrees advanced, 85Aero, Tue, 2 Mar 2010 22:01:14
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According to my repair manual, the manufacturer does not provide a specification for compression, but anything less than 10 bar is not good, and you should see no more than a 2 bar difference between any two cylinders. Also, 5 cranks is too much. You should notice a maximum reading by the second compression stroke on a given cylinder, and generally be looking for relatively even jumps on the gauge. I generally look for 150psi on a compression test, and if I see more than 10% variance between cylinders I'm not happy.
Also, I would like to add; the first rule of tuning an engine is to do so only on a healthy engine. You do not have a healthy engine, and running advanced timing and high boost pressure will rapidly accelerate the problems. I suggest dialing things back to normal and taking it easy on that thing until you're ready to repair or replace the engine.
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