FoT,
Boring Liners has the makings of an interesting thread. It has come up from
time to time. The following is one method that comes from highly regarded
preparer of race engines:
" I have raced TR4s for thirty years now and it has always been my
understanding that to properly bore our wet liners, they need to be in the
block and torqued down with a torque plate. This way any machine shop can
bore them. And then the engine is built as far as you can go before removing
the plate and installing the head. I thought that to just bore them
individually and then install them will cause some distortion in the
cylinder and this will work havoc on the piston and rings. I install the
figure 8 gaskets I am going to use and I use a head gasket like I will run
and I torque the head studs to 100 ft. lbs. The engine is
then treated just like a normal engine up to the point of installing the
head. The plate is removed and the head with new gasket is installed and
torqued. The crank is not turned between removing the plate and installing
the head. This system reduces the distortion as much as possible. I have
heard of as much as .005" of distortion after boring and then torqueing in
place."
It simulates the actual condition of the engine, as far that it can be
simulated. It makes sense to me, although I have never taken things this far in
my
own prep. I subscribe to the fixturing described, but have not used the gaskets
and never had the crank installed. Always more to learn.
Joe Alexander
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