[6pack] Compression readings

[Sally or Dick Taylor]

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 at autox.team.net, 6pack at 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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