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New pistons seem like they're pretty expensive.
What parts of the pistons wear? The ring
guides? Do they get pitted from pinging? What are
the drawbacks to reusing pistons that are in pretty
goodshape (so long as the cylinder walls are okay
and soon)? Also what about the deves reringing kits
that IPD sells -- how do they impact the quality of
the rebuild?
Specifically my 1968 144 with the original B18
smokes a *lot* on hot starts, has rotten (but even)
dry compression and pretty good wet compression,
and has really bad blowby (I pump 1qt of oil out the
top of the motor if I drive for 60 minutes on the
freeway). I've never had the head off of this car,
but since it has only 142000 miles I don't expect
there to be much wear on the cylinder walls. I was
planning on replacing the timing gear, cam, lifters,
and replacing the rings or rings + pistons, and
replacing the lower main / rod bearings (if they're
worn). The only reason I want to rebuild the motor
is to address the blowby problem, which I haven't
been able to fix otherwise, so I can drive the car
long distances without running the motor clean out
of oil and making it go boom. Otherwise, the car's
perfect.
Obviously you're not going to be able to tell me if
my car needs new pistons, but has anyone ever reused
the old pistons with new rings? How long did the motor
last? Would you do it again?
Thanks,
chris
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