Thread: Inconsistent Compression Numbers?

You're supposed to crank until the needle stops jumping

so you can max it out to 170ish sometimes and other times just 140ish? but regardless of which cylinder? I would chalk it up to the conditions during the test, weather it's a lube issue or the heat of the block.

I assume this is all with the engine at operating temp?

Yeah everything is done right, oil changed about 500 miles ago and yes regardless of which cylinder sometimes it'll go to 170, I've got 1, 2 and 4 up to 170.