John-
I had those same rings in my first TR3A, 1959 TS40360 The lower
ring was below the wrist pin ( uh, gudgeon pin?) on the piston skirt, and I
think it was an oil control ring, identical to the other oil ring just below
the two compression rings at the top. The motor didn't seem to behave any
differently with the extra ring, and it burned no oil. The motor had
apparently been rebuilt at some point in its life, as the Conn rod bearings
were .020", mains were stock. This was back in '72, I have no detailed
records.... I would use them if they seem undamaged. You might lose a few
HP with the extra frictional losses caused by the 4th ring, I'd save my $$$
and spend it on a good engine balancing job.
Good luck!
Bob Westerdale
59 3A TS36967
-John wrote....
While reading Roger Williams new book on the TR4 I noted a comment
he made about four ring pistons: " you should treat with suspicion any
83mm pistons you are offered at an autojumble, for example, since they
are likely to be ex-MOD Standard Vanguard equipment. In particular, watch
out for and avoid any 4-ring pistons, as these will almost certainly be
Vanguard low-technology gear....". This worries me as my project TR2
engine was fitted with a set of liners and pistons in very good order, which
were 83mm, which I wanted, and both liners and pistons were marked
AE. The pistons are 4-ring, but one ring is near the bottom of the piston.
The diagrams I have seen of Vanguard pistons has all 4 rings at the top.
Should I discard my set?, are these Vanguard items?, or does anyone
know where they may have come from. There seems be too little wear in
comparison to the rest of the engine, crank etc for them to be the original
items. All wisdom welcome
John
1954 TR2
John Gillis
1954 TR2
1972 Triumph T100 P
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