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.