In a message dated 8/11/2004 5:14:14 PM Eastern Daylight Time,
tr3driver@comcast.net writes:
Bill, the whole point of TeriAnn's post was that there is no "psi number to
shoot for". What you should look for when doing a compression test is the
same number in all cylinders. The actual number is affected by way too many
variables, only the variation is significant when checking for wear/leaks.
So, if all your cylinders read 120 psi, then your engine is fine. But if
one reads 120 and the others all read 150, then there is something wrong.
Of course, if you DID want a "baseline" number, the TR2/3 Workshop Manual
quotes "Compression Pressure (With three Sparking Plugs fitted and compression
gauge in fourth cylinder engine warm, throttle set at tick over, useing 20 SAE
oil and operating the starter) Average reading 120 lb. per sq. in..."
--Andy Mace
*Mrs Irrelevant: Oh, is it a jet?
*Man: Well, no ... It's not so much of a jet, it's more your, er,
Triumph Herald engine with wings.
-- Cut-price Airlines Sketch, Monty Python's Flying Circus (22)
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