You don't suppose doing away with the pressure control valve
caused
Chuck Harberts oil cooler to fail and caused his in-flight fire
do
you?
I'm quite certain that Chuck had made no such mod. There were other
contributing factors, and since he had three oil coolers in series; the
other two in the nose of the Velocity, I was guessing that the pressure
in
the first (the one that ruptured) was running at or near whatever the
bypass
relief is set for.
I was told (at some point) that the reason for the Oil controller
valve
(which releases at around 150psi) was to provide a safety release
should
the
oil cooler or filter be clogged and prevent those components from
bursting
under the resulting high oil pressure. The normal oil pressure
regulator is
for the routine regulation of oil pressure under normal conditions.
Ed Anderson
We need to devise a pressure test where we can check the operation of
that
valve. I think we can plug tap a front cover right where the problem
O-ring
is normally located. Pump it up with a hand hydraulic pump through
the oil cooler outlet fitting on the front of the cover. Then measure
the point where the spring releases the pressure increase.
Good idea. I have asked three others what that bypass pressure is and
got
three different answers; all of which were best guesses; and all were
lower
than 150#.
And is it the same for a 20B and 13B?
Al Gietzen
Al,
FWIW The 91 RX-7 Mazda Workshop Manuel on page D-3 lists the Oil Control
Valve Relief Pressure as 156 psi. The Oil Regulator Valve Relief Pressure
is listed as 71 psi.
Ed Anderson
Referring to my 1986 Mazda workshop manual, technical data page 30-4: pressure control valve relief: 156 psi
regulator valve relief: 71 psi
Yvon.
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