Robert---The compression test readings you show are very high, esp. for the '74
model which has a relatively low CR from the factory. If the head was milled
quite a bit at some time in the past, then this would account for these
readings. Ideally, compression readings shouldn't vary more than 10% among all
cylinders, but engines can seem to run well when outside these parameters. If
a valve lash check wasn't performed before the compression test was done it
would be good to do so, then a re-check of the compression.
A compression tester isn't normally an expensive tool. A leakdown tester is
quite a bit more. Both are good to have in one's toolbox.
None of this as anything to do with the distributor, of course.
Dick
-----Original Message-----
From: robert rudolphi
Sent: Wednesday, February 23, 2011 11:25 AM
To: triumphs@autox.team.net, 6pack@autox.team.net
Subject: [6pack] Compression readings
Hello All,
I recently did a compression test on my 74 TR6 in advance of
sending my
distributor off for a rebuild. The results came back :175, 190,
210, 220, 180,
180. I have now heard this may be a problem. I used an
expensive Harbor Freight
tester but assuming these are accurate does this
mean time for a rebuild or
other issue?
Thanks in advance for any feedback
Robert
Robert Rudolphi
1974 TR6
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