Guy,
Those are great numbers. I went with the 87mm pistons when we re-built the
TR3 3,000 miles ago and I just checked the compression last weekend
150-155psi and I am very happy.
Obviously, compression numbers will vary dependant on the compression ratio
but for a relatively stock engine I would say 165psi is a real good number.
Bill
Bill Beecher
'58 TR-3A TS30766L "Tarbaby"
www.triumphowners.com/1566
"A Triumph is man's best friend, it always comes when it is called...of
course, some times it is difficult to make it go"
-----Original Message-----
From: triumphs-bounces at autox.team.net
[mailto:triumphs-bounces at autox.team.net] On Behalf Of G.D. Huggins
Sent: Tuesday, November 08, 2011 6:26 PM
To: triumphs at autox.team.net
Subject: [TR] TR4A - Compression Check Numbers
All,
My engine, with 87mm pistons, now has 700 miles on it with no issues. (knock
on wood.) Just ran a baseline compression check for future comparisons.
Numbers were as follows:
1 - 165 psi
2 - 167 psi
3 - 169 psi
4 - 168 psi
Looks like a good grouping, but do the numbers look good for the mileage?
Unlike the cam lobe lift numbers, I cannot find any compression numbers in
the manual to compare these against.
Cheers,
Guy D. Huggins
1965 Triumph TR4A
CTC 63569LO
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