<VV> Compression

[Chris & Bill Strickland]

I haven't used a compression test to evaluate the condition of an engine 
for a long time -- that is what leak down tests are for.  A compression 
test is for when you know something is wrong, but you don't know which 
hole it is and you want to confirm before you tear it down -- not sure 
why, cause you're still going to tear it down ...  (maybe it's a valid 
way for a less experienced tech to check whether the hole is bad due to 
internal problems or external ones -- say valves vs. plug wires)

Even then,  the values in a leak down test are really only valid 
evaluating the cylinders between themselves on that one vehicle, and 
only vaguely related to any "standard" value.

Bill Strickland