question about compression test
02-12-2006, 07:01 AM
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question about compression test
Hi, my 944 is a N/A 1987 with 110kW M44/07 engine. Should it have 9.5 or 10.2 compression ratio?? And how much compression on cylinders should it have?
Engine should be warm or cold when testing??
Some time ago with 15W 40 mineral oil had 152-16-psi on each cylinders and I want to know is it low or high, or maybe I did the compression test wrong.
Engine should be warm or cold when testing??
Some time ago with 15W 40 mineral oil had 152-16-psi on each cylinders and I want to know is it low or high, or maybe I did the compression test wrong.
02-12-2006, 10:48 PM
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Engine should be warm when testing the compression, and you should do a static and a dynamic compression test. Static is with the fuel pump fuse pulled, crank the engine 5 times or so and record the number. Dynamic is when you put the compression tester in and start the engine and record the number. The dynamic way is preferable, as it will simulate a running engine the closest.
