| Steve,
I disassembled both the 13b and 20b OMPs tonight. Best I can tell, the OMP doesn't actually pump oil as much as it "meters" the oil. It appears to be a small spool valve device. Instead of the spool moving, the lever moves the outer part back and forth in relation to the spool valve. Moving the lever full open causes the outer body to move in relation to the spool valve allowing oil to flow through the passages providing maximum oil flow. Move the lever the other way and the outer body moves the other direction (in relation to the spool valve) reducing oil flow. When the outer body moves from closed to open, its holes come into alignment with the outlet holes in the OMP. Excess oil is routed through the pump body to the crankcase. At least that's how I think it works, but then I could be wrong.
If I could drill out one of the smaller outlets to equal the larger ones, then this may work just fine for the 3-rotor. Following the 20b design, I could then plug the 4th hole.
Mark
On Mon, Apr 9, 2012 at 8:49 PM, Steven W. Boese <SBoese@uwyo.edu> wrote:
Mark and all,
The information that I previously gave on the '86 OMP delivery is in error. After further analysis of the disassembled OMP, I realized that the delivery rate for the front two ports depends on the DIFFERENCE between the diameters of the two sections of
the pump piston. The result is that all four of the ports deliver the same flow rate. This would make the application of this OMP to a three rotor engine more difficult, in my opinion. Of course I could be wrong about that, too.
I apologize for the mistake.
Steve
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