The higher compression the engine the more power it can theoretically produce. The compression ratio is mainly determined by the type of fuel being used.
Depends on why there is no compression.
a diesel engine uses compression and has no need of spark plugs
If engine is losing compression it is likely the rings are worn and need replacing. The valves are likely leaking too and need replacing.
Loss of compression is caused by bad internal engine wear or internal engine failure. Both mean the engine will need serious repair
because a diesel engine ignites its fuel with pressure, and not with a spark like a petrol engine. that is why a petrol engine does not need as high a compression ratio as a diesel engine
If there is NO compression on any of the cylinders, you've probably slipped the timing belt/chain. Just knowing that there is no compression is insufficient information to make a decision about replacing the engine. You COULD need to have the engine rebuilt, or it's possible that a valve "kissed" a piston and the engine is toast. Or... it could be something else. If it's just low compression in one or two cylinders, it could even be caused by burned or sticking valves.
Replacing engine and need information.
Normal compression on a gasoline engine is about 125 psi.
You will have an improvement in engine performance and an increase in compression unless the compression rings on the pistons need replacement .
No, The compression test is done as the starter cranks the engine
The correct engine compression on a 1972 Datsun B110 is a 15:1 compression.
Need to know what size engine it has to answer correctly.