There is an oil supply gallery from the mating surface
of the front cover forward (in the car)
to a cross gallery, then to a short gallery to the OMP
mounting surface. It just supplies oil to the pump. I tap that gallery for
a 10-32 socket head screw used to block the gallery right where it
starts.
If the pump is left in place, remove the E clips and
slide off the drive gear and key. Put them in a bag in case you want to use the
OMP at a later date.
86 to 93 cranks have a thermal pellet in the nose that
controls oil flow to the rotors for fast warm up. I just read that in my Racing
Beat catalogue. I have never seen one so I do not know if it dumps excess oil,
or prevents its flow to the rotors. So the effect on oil pressure is not known
to me. I have read that there is a plug that can be installed to replace this
system.
Mistral solved one of their oil pressure /
temperature, problems by removing the bug screen from the oil pick up tube.
They were also using multi-grade air plane oil. It foams up badly and looses oil
pressure, and cools poorly as it slows heat absorption and heat release in the
cooler. They went back to a straight weight car oil and cured most of the
problems.
I would try a nice straight 50 or 60 weight Valvoline
racing oil. If it is not the cure, at the least it won't hurt anything. It might
hold enough pressure to get you home. Racing oils have more Zinc anti-scuff and
more anti foaming agents.
Synthetics are like cat pee when hot. Not very
thick.
Lap the pick up flange dead flat and install
with no sealant. Torque only to spec not more. I welded a large thick
washer to the tube end and radiused the wash/tube to look like a trumpet bell.
The end of any tube in suction is a flow disaster.
I use Weber 180 jets in the crank. The 200 size leaves
you with about 10 pounds of pressure at idle. I idle at 2,000 to 2,200 RPM and
only get 60 to 70 pounds with a huge Moroso oil pump.
It hops up to the regulator controlled 100 PSI for
racing just off idle.
Don't make me drive to Houston.
Lynn E. Hanover
In a message dated 8/24/2013 3:58:31 A.M. Eastern Daylight Time,
cbarber@texasattorney.net writes:
I am not sure if the orifice is closed off. I have removed the oil
metering pump as I pre-mix. I have a plate over the mounting place of
the oil pump....is that what you refer to? It does not sound as if this
is what you mean. The metering pump drive gear IS still in place.
Can you provide more information on the orifice. A picture would be
great but I know that's a long
shot.