<VV> More on piston rings concern or.. improvement ?

[Roger Gault]

Daniel,
Generally, it is best to have wear surfaces change relative position.  It
spreads the wear around.  Engineers do all sorts of things to try to assure
that this happens.  Lifers are ground so they rotate.  Gears use an even
number of teeth on one gear and an odd number of the mating gear.  Valves
are sometimes fitted with rotaters so that they turn relative to the seats.

I'd think you'd be better off leaving the rings free to rotate.  The end gap
is nearly zero, and I doubt seriously that it makes any difference if two
line up - there's just not enough flow through them to matter.

Roger Gault
BSME

----- Original Message ----- 
From: "D. Monasterio" <dmonasterio at megared.net.mx>
To: "virtualvairs" <virtualvairs at corvair.org>
Sent: Wednesday, July 25, 2007 12:11 PM
Subject: <VV> More on piston rings concern or.. improvement ?


    In fact, I am playing with the idea of preventing piston rings rotation
(on next engine) so, the real concern is: Do non rotating rings could make
some improvement ?... toughts about ?

    Thanks

    Daniel Monasterio


<< Back on the early 60s I had a German motorcycle (Durkopp, 2 cycle engine)
and it had a small pin inserted in each grove of the piston to prevent rings
from rotating. The ends of the rings were trimmed about half of it's
wideness to allow installation with the inserted pin.
   There is enough room on a Corvair piston (1st & 2nd grooves) for the pin
and trimming the ring ends looks easy.>>
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