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 Tue, 2 Mar 2010 21:09:36
In Reply to: Re: No knock despite 18 psi and 15 degrees advanced, 85Aero, Tue, 2 Mar 2010 19:52:40
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I assumed you were using an LED indicator with the modified APC, but thought it best to be sure. So the initial compression test was performed without oil in the cylinders and again with oil? You mentioned the compression came up to 125 with oil in the cylinders, correct? A 25% increase in compression with oil in the cylinders is enough to suggest worn piston rings. However, 125psi is still low, so even if you couldn't hear a loss, I find it hard to believe there isn't another compression loss. My thought would be carbon buildup on the valves due to incomplete combustion, caused by the low compression.
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