Jim Davis wrote:
> List,
> No one responded to my earlier post so I'll try again with some
> additional information: I called BPNW and they faxed me the instruction
> sheet that should have been packed with the rings. According to their
> spec. sheet, the "normal" gap for rings in TR6 size bores is .008" to
> .014". The "maximum gap" is .08" to .024" Since my gap is .018", it
> falls in their "maximum" range, but outside the normal range. I don't
> feel comfortable with Abby Normal ring gaps. Is this a problem? Not my
> conformist tendencies... the ring gap. I've never come across rings
> that were too short. Always had to file them a bit, or they were in
> spec.
> If no one on the list feels qualified to give advice in this matter,
> does anyone know how I can get in touch with someone who might.
> Help!
Jim,
Sorry I missed your post earlier. I meant to ask you something about some of
the data you posted. You say you have .040"
oversize pistons, yet your new finished bore is 2.969". Unless I'm missing
something, standard bore is 2.9405"~2.9416" meaning
that you only have a .028" overbore. I would go back and carefully check the
dia. of the bore and the dia. of the barrel and
crown of the piston. Make sure your piston-to-wall clearance is right before
you worry about the rings. Then make sure the
rings are within spec. IMHO I'd prefer rings to be a little loose rather than
tight. That way you have a little extra
protection in case of overheating so the gap doesn't close up completely when
the ring expands, but .005" over spec is way out
of line for a new engine.
Good luck!
Brian Schlorff '61 TR-4 '64 TR-4 '72 TR-6 '79 Spit
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