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Al,
the oil entrance is right behind the
relieve hole on the other side of the shaft bore, coming out of the cover
wall.
Oil will leak out when the shaft is bad.
Under normal condition, there can be no pressure buildup in the pump, because it
is all open to the crank case via the oil inlet and relieve hole. BTW, the shaft
has a flat section on its running surface toward the pump for oil
feed.
The actual pump does not have a drive
plate. The picture shown on the ACRE site has no resemblance with the physical
design of the real pump. There are even functional differences. The most
significant functional difference is that the piston makes two strokes per
revolution.
----- Original Message -----
Sent: Monday, October 04, 2004 7:05
PM
Subject: [FlyRotary] Re: OIL METERING
PUMP
Subject:
[FlyRotary] OIL METERING PUMP
Richard;
Thanks for input on
this. That relieve hole looks very large and not likely to blocked,
especially on a newly rebuilt engine. Or am I looking at the wrong thing; how
does the oil get into the recess?
Oil entering the
pump can leak past the adjuster shaft if the seal was bad, right? And
what happens to the oil that enters the piston with the blocked exit port as
the piston moves to eject the oil? I was thinking it gets forced back
past the piston into the drive area where it can then leak past the adjuster
shaft, but I guess the feed oil is in that area anyway. Still; it seems
forcing the piston against the oil with no exit port would put high stress on
the drive plate, no?
Al
Al,
here is some more info on the OMP
oil feed.
Oil is coming into a recess in the
pump drive shaft. The thus formed cavity has a relieve hole as shown in the
pic, making the pressure in the cavity practically even with the crank case
pressure, depending someway on the flow rate. The roll pin in the relieve hole
is to make sure there is no air pocket in the cavity, which is connected to
the pump intake.
Each out put is driven by a
separate piston and two are together
per stroke. Each stroke is small enough not to create
a problem when you block a line off. It Would not hurt the pump if two
outputs are connected for double oil flow.
I hope it is clear, and not
confusing.
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