George Bernard Shaw
wrote in message ...
On Sun, 21 Oct 2012 21:33:50 -0500, "RogerN"
wrote:
snip
So, should I get a good home (Lisle 15000 maybe?) and hone the cylinders
to
size or is their some benefit to having the cylinder bored at a machine
shop? Depending on how everything else goes, I may just get a rebuilt or
remanufactured engine and swap it myself, spending $2k (maybe less) on an
engine is a lot better than $4k for an engine in this older car. It may
be
good for another 5 or 6 years if I can keep clear of the deer!
Thanks!
RogerN
You cannot afford the hone required to take out the damage to the cyl
and fit an oversize piston. First oversize is likely 10 thou over -
typical honing (with a VERY expensive Sunnen type fixed hone) is in
the order of a couple thou. Get the block bored for oversize pistons,
and finish honed to proper fit. A LOT cheaper than buying and using a
fixed hone.
Been a mechanic since 1969.
At the machine shop we used a home similar to this:
http://www.amazon.com/Lisle-LI15000-.../dp/B000GKIE4S
We relined tubes that were around 36" long with stainless steel pipe and
then honed, I don't remember for sure, around 100 thousandths out of this
stainless steel bore. This took a few hours to get it honed to size but we
were removing a lot of metal much more difficult than iron in around 36" of
cylinder. I removed 0.020" from my motorcycle cylinder in a fairly short
amount of time, maybe a half hour to 45 minutes with a lot of stopping to
measure several different places. I normally didn't hone because the boss
had more critical jobs to do so I stopped more often to see how fast
material was being removed, checked taper, measured diameter X and Y, etc.
I'm confident that I could get the bore the right size in a reasonable
amount of time with a hone like the Lisle, but, like Jon said, I don't know
the surface finish would be right and it looks like I can have it done
cheaper than the price of the hone not considering the time plus the price
for the heavy duty drill.
I had a buddy tell me he polished a cylinder in a model airplane engine, the
piston seized up, seems it needs them grooves for holding oil! I can see
that the finish could be important for proper break-in, wear, the ability to
hold oil in the "scratches".
RogerN