"calhoun" wrote in message
...
Just a guess but doesn't 9.5 to 1 mean you are compressing 1 lb to be 9.5?
So if air pressure at sea level is 14.6 than compressed 9.5 it would be
about 139.

"m Ransley" wrote in message
...
OK but what compression rating equals what lb. a factory new 9.5-1
equals how many pounds pressure with a compression tester. It has to be
a simple formula.



The compression ratio is by volume. If there are no leaks and the valves
are closed when the compression starts , then it will be 14.7 (air pressure)
times the ratio.