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One thing you may want to check on (Rusty are you still
on?) is that while the Harrison GM cores can take a lot of pressure, the
pressure pulsations by such things as positive displacement oil pump could
possible fatigue the metal. While I know of no conclusive proof of this
happening, there has been more than one failure of a Harrison GM core being used
as an oil cooler.
I know that Tracy took special steps to "reinforce" his
oil cooler and also has a oil accumulator to absorb the pulsations from
the oil pump. Would seem like a good idea to me.
Apparently the centrifugal pump (such as the water pump)
causes far less (if any pulsation's) but an oil pump is a different
horse.
Ed
----- Original Message -----
Sent: Thursday, November 15, 2007 2:29
PM
Subject: [FlyRotary] Re: Harrison
cores
I did a quick internet search for Harrison specs., and
found a document that mentions Harrison specified them as 400
psi.
This is actually kind of fascinating in that it's a
report on running a turbocharged engine on LP and doing intercooling
with the Harrison core as an intercooler.
Grant Schemmel
Tracy and
Lynn,
How much pressure are
these cores good for? I plan to run dry sump with at least 60
lbs.
Thanks!
Ben
----- Original Message -----
Sent: 11/15/2007 1:43 PM
Subject: [FlyRotary] Re: Harrison
cores
I am absolutely amazed at how well the GM evap. core is cooling the
oil on my 20B installation. Cooling well at WOT on the ground!
I would have previously thought this was not possible with a thick heat
exchanger. It does have the best diffuser I've built to date on it
and has prop blast into it.
Tracy
On Nov 15, 2007 1:33 PM, < Lehanover@aol.com> wrote:
The Harrison built (same as Corvette radiator) used in air
conditioning in full sized GM cars are designed to flow a major amount
of air. They are cheap even when bought new. They transfer heat as good
as anything you can find. They are compact. Two of them can dump the
heat from most any rotary installation. Two of them for coolant and one
for oil has been proven in a number of installations.
If you want less cooling drag build the radiators into the wing
skins like a Supermarine racer.
I raced for years with one Harrison core for oil cooling in front
of the water radiator. A poor installation with heated air going through
the water radiator, but it worked just fine.
Lynn E.
Hanover
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