[svxistentialist]

Originally Posted by YourConfused

Precisely, that's why all 6 plugs get removed, to allow the motor to spin freely.

Thanks.

I understand it better now. Not having ever done a compression test, or seen it performed, I was unaware of the methodology.

Everybody was saying HOW the test was done, without saying why it was done that way, and I didn't phrase my original question too well. Not everything is obvious to the first timer.

Joe