In my never-ending amateur's quest for better performance out of my '51 M38's
L-head engine I decided to test the engine compression. The repeatable
results were as follows:
1 105 psi
2 95 psi
3 103 psi
4 94 psi
But are these numbers too low? Friends have said that it is quite important
that the readings not be below 100 psi. My M38 Tech Manual lists 135 max 100
min, as does my MB manual reprint. I'm at the low end certainly, but should
I pursue it further at this point?
I've also heard that it is even more important that the pressures be within 5
percent of each other -- the M38 TM calls for pressures within 20 psi of each
other. Looks like I'm not in bad shape as far as that goes.
Any opinions?
Steve Johnston
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