I used Bellville washers under the nuts on the 4 threaded rods which
will allow the tanks to thermally expand. Left about .040" of travel in
the washer stack for this purpose. The spring pressure on the tanks is
about the same value as the oil pressure trying to split them
apart, according to my rough calculations. I'll still use
the accumulator to damp out pressure pulses if I try this thing though.
Random thought: Very strange that Lynn and other car racers have not
had a problem with the cores but you busted 2 of them. BTW, your
aluminum welding looked fine to me! My AL welding looks like hell so
far.
----- Original Message -----
Sent: Monday, December 19, 2005 2:06
PM
Subject: [FlyRotary] Re: Heat
exchangers
Here is a picture of the Ford fitting
attach area. Note the strap to hold the stack together. Also not the 1/8 thick
plate that the fitting is attached to. Looks like this may have been a fix for
a design problem with the other cores.
Hi Monty,
I wonder about the wisdom of trying to restrain the
cores from being able to expand. I installed a radiator that came
with dire warnings against rigidly mounting it. They said it
had to be allowed to expand and contract with temp changes, and if you
mounted it rigidly, it would fail in short
order.
I realize the strap in the photo is stock, and
perhaps if you keep the same type material (aluminum, steel, etc), and subject
it to the same temps, then it will expand and contract along with the
core. I just don't think it would be wise to try to beef up a core,
without knowing what new stresses it might cause.
Cheers,
Rusty