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The correct engine compression on a 1972 Datsun B110 is a 15:1 compression.
It varies with each engine but what is more important is that all the cylinders are within 10% to 15% of each other.
standard compression is 178psi min is 142 psi. +/- 15 psi between cylinders. That's for the 2.2 engine.
The compression can be different from one engine to the next depending on mileage and maintenance. What is important is that all cylinders are within 10/15 lbs of each other.
NO. That is to low. If it is a good tight engine it should have at least 150 PSI per cylinder. You can not have any more of difference then 15 LBS per cylinder are the engine will idle rough.
It will vary from one engine to the next. What you want to see is that all the cylinders are within 15% of each other.
They all should read at least 140 LBS. There should be no more then 15 LBS difference between any cylinder. If there is then you will have a rough idle. And the engine will not run right.
NO. It should start at about 150 LBS. PER cylinder. And you can't have anymore then a 15 Lb. difference in any cylinder, are the engine will idle rough.
The compression and ventilation ratio for a two-person rescue CPR is 15 compression and 2 breaths.
between 90-120
The easiest answer is when it fails a compression test. Buy a compression tester (farily cheap), and test each cylinder. If one single cylinder is below 120 psi, or if one cylinder reads 15% less pressure than the cylinder with the highest pressure, your engine should be torn down and checked. The problem might only be in the heads, but it's still time for some serious work.
A new engine would have 150 LBS or more per cylinder. A used engine that runs real good and that has plenty of power should have at least 140 LBS. per cylinder. If there is more then a 15 LB. difference in any cylinder then you will have a rough idle and maybe an engine miss at a idle. That means there is an internal engine problem.