the compression on my front and rear rotors are 75 and 30 psi , respectively at 200 rpm (sea level). Sould be engine be able to start? Thanks.

I am not sure the minimum to start but pull start it. If it doesn't start doing that then most likely it will not.

Difficult to say, but probably not.



As toddp31 sez, towing is the best way to tell (that will usually start a marginally low comp motor).



I would be most concerned about the difference in pressure between the two... https://www.nopistons.com/forums/pub...DIR#>/ohmy.png

well the engine is already out of the car.....just second guessing myself. THanks though.

Dump a few ounces of ATF in there before you try to start it. The oil will help the seals do their job a little better and hold compression.

why only 2 numbers for compression? there are 3 sides to each rotor, so you should have 6 numbers for compression. https://www.nopistons.com/forums/pub...1047683561.gif

Six numbers if one uses a rotary compression tester. Two numbers with a regular compression tester. Three rotors are nine and three.

Got a car in the shop right now that is all stock with like 90k on the original motors. Compression is about 5 on the rear rotor, and 4.5 on the front. Suprisingly it still starts.

Holy shiznit, that is one tired engine.