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post #8 of (permalink) Old 11-07-2018, 10:47 PM
klhansen
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Quote:
Originally Posted by chuckster57 View Post
Just thinking out loud, wouldnt a compression test at 5500 ft elevation yield lower numbers than sea level... Maybe 250 at elevation isn’t that bad.
Wouldn't make that much difference. Intake pressure would be ~2.5 psi less than at sea level. An engine testing 400 psi at sea level will read about 341 psi. So adjusting for the OP's test to sea level would be 293 psi. Not terrible, but the starting difficulty at altitude sure indicates the engine is on it's last legs. Maybe moving to sea level would prolong it's life for a few years.

First truck -- 1929 Model A Ford pickup, restored from ground up. Wish I still had it!
'99.5 F250 PSD Supercab LB 4x4, ZF-6 w/SB Con OFE, 3.73LS, Boost & pyro gauges, Swamps S175/146 injectors, DP 80 HP Econo PCM (classic version
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