We call this a relative compression check as it does not give you an actual compression number in PSI but lets you quickly compare cylinders. In this example a 5 minute test told us this customer has a mechanical compression problem which required further investigation. As it turns out the valve clearance on Cyl 2 was tight. The other information we can gather from this is starter and battery condition. Peak starter draw should be under 400 amps and battery voltahe should not drop lower than 8 volts. This test costs only $27.50 and is a great way for you to get a quick check on your motor, battery and starter health !
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