An engine compression test on a 99 Grand Prix GTP can cost $180
Normal engine compression would be 100-125psi
The Diesel
I believe that it would be density. The more dense a sample is the more compact the molecules are. The description of compression is to reduce by volume, so the ability to withstand compression would be the lack of room to do the compression. Can anyone add to this?
The engine would not run. The engine would lack compression.
The Cylinder head could be damaged or a ring out of place, causing the release of air, making less compression
on any engine good compression would be anything over 100psi, though really good can be up to 150+ anything under 90psi and your engine will not run.
The piston rings may be worn out .
your answer is not easy. do you want ratio or compression pressure. I would guess you are talking pressure, which on a stock engine is around 155 lbs.
A compression test would read "0".
many would simply call it a diesel engine, in reference to the most commonly used fuel for them.
Run a compression test. When engines overheat the head(s) often warp causing the head gasket to blow. If you find low compression between any two cylinders OR if any of the sparkplugs are wet with water or coolant as you do the compression test, it's the head gasket and warped head. BTW, that's one of the most common problems that shows up after an engine has overheated.
Well if you lined up the timing marks properly then it would not matter. The engine would run anyway.