Re: what is meant by 150 lbs on compression tests? - Saab 900 Bulletin Board - Saabnet.com
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Re: what is meant by 150 lbs on compression tests?
Posted by lms (more from lms) on Thu, 27 Mar 2003 19:37:40
In Reply to: what is meant by 150 lbs on compression tests?, 87saaber, Thu, 27 Mar 2003 18:13:07
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I'm not sure what the reading should be on your car. But all cylinders should be within one another. When the piston moves down, it creates vacuum, when it moves up, it creates compression or pressure. You stick a guage in one of the spark plug holes, dissconnect the coil and have someone crank the engine over a few times while you watch the guage get to the highest point. Write it down, go to next. When one cylinder is much lower than the others, it's usually because a ring has gone bad, crack in the head, piston has melted or has a hole in it.
posted by 12.7.2...
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