Re: Pressure Test - Saab Performance Bulletin Board - Saabnet.com
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Re: Pressure Test
Posted by Joe Boucher [Email] (more from Joe Boucher) on Thu, 25 Jan 2007 14:24:39
In Reply to: Re: Pressure Test, lms, Thu, 25 Jan 2007 14:13:18
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No me and my friend want to see how well the piston rings and valves are sealing so my friend found a test for his M3 that you remove the spark plugs and screw a gage into the spark plug hole and then crank over the engine. The gege will give you a pressure reading you have to be above a certain pressure and then you do it for every cylinder and the pressure is supposed to be within like 5-7 pounds of each other. If you don't have the pressure within that band from cylinder to cylinder you might have a leak so they say to remove the oil cap and if you feel air come out of the oil cap the piston ring is bad, if air comes out of the intake its the intake valve and if it comes out of the exhaust its the exhaust valve. So I guess to answer the question it would be the cylinder pressure with the air fuel mixture.
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