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Engine Compression


Vehicle Information: Year: 1985; Engine (size, modifications): 5L; Total Mileage: 102000; Transmission type: Autotomatic;

I want to thank you and the tech committee for your help and support. I found that my cam timing was off. Not between the intake and exhaust cam (4 cams), but the exhaust and intake cams with their respective timing belt sprocket.I set the degree so that when the no 1 intake was down .062in the crank was at 20degrees ATBC. After the correct setting, I had 175psi +or- 2psi in all cylinders. I did a leak test one no1 cylinder, and got 4% leakage through the rings.

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