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Compression Testers


Miked2002

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I have two. A Craftsman and a Snap-On. I use what I grab. They are comparable to each other. I use compression results as an indicator for cylinder to cylinder comparison rather than end results. Cyinder to cylinder should be even across with no more than a certain percentage difference with a certain percentage of total deviation from highest to lowest.

I combine this with a leakdown test as well as vacuum gauge observation. Although at altitude vacuum gauge is the least helpful at showing a full range of vacuum.

So when I tore down my engine at the beginning of the winter I had fairly good idea of what the initial trouble was. There are general guidlines as far as compression numbers for poor to excellent compression. I think there is a write up on general compression testing.

Daron

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Something to keep in mind: if you get one of the above, you have to push it into the plug hole while turning over the motor. That means an accomplice or remote starter switch. If you get one that screws in, you can use the key to turn over motor, but I've had them stick in there - that means trying to twist it out with a rubber hose. And getting them started is good fun. I ended up using on of those original tool kit plug tube tools with the hose placed inside to get things lines up.

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