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I bought a new Eastern Technologies E2M diff press tester with master orifice as recommended by TCM, and followed the instructions on performing the master orifice test which came with it.
The M.O. test instructions do not say how to evaluate the test or what to do with the result.
I got 76/66 or so and when the LH gauge is brought up to 80 as specified I get 70 on the right hand gauge.
Presumably the M.O. simulates a leaky cylinder.
I called Eastern and they said that the way I use the "70psi" is that is the new cutoff for a bad cylinder. (Yes I know all the arguments about a cylinder might be just fine at 50 but let's skip that for this discussion and assume we want a specific number below which we no longer have faith in the cylinder's future.)
I said, what about the 60/80 that many, including the manufacturers used to use as the cutoff? He said that was for the old 0.040" tester that people commonly used. The SB above notes the MO test as defining the new lower limit.
Any comments?
(my guess is a lot of mechanics still use the 040" orifice on their compression tests in large bore engines)
The M.O. test instructions do not say how to evaluate the test or what to do with the result.
I got 76/66 or so and when the LH gauge is brought up to 80 as specified I get 70 on the right hand gauge.
Presumably the M.O. simulates a leaky cylinder.
I called Eastern and they said that the way I use the "70psi" is that is the new cutoff for a bad cylinder. (Yes I know all the arguments about a cylinder might be just fine at 50 but let's skip that for this discussion and assume we want a specific number below which we no longer have faith in the cylinder's future.)
I said, what about the 60/80 that many, including the manufacturers used to use as the cutoff? He said that was for the old 0.040" tester that people commonly used. The SB above notes the MO test as defining the new lower limit.
Any comments?
(my guess is a lot of mechanics still use the 040" orifice on their compression tests in large bore engines)