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----- Original Message ----- From: "David Staten" <Dastaten@earthlink.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Thursday, January 13, 2005 6:38 PM
Subject: [FlyRotary] Oil Metering Pump... again
Ok,.. I rec'd a pair of electric oil metering pumps in the other day and set about to cleaning them. Since as of this moment I have NOT closed the front cover on Engine #1 (overtorqued the engine oil pump bolts and had to extract them) I decided to look at things again.
Originally I had thought that the lil hole on the front cover mounting pad next to the OMP driveshaft was an oil feed. Upon closer look it appears that it is an oil DRAIN and that oil is fed to the OMP along the periphery of the drive shaft/passage. Interesting. I disassembled the electric doo-hickeys from the OMP and it appears that they are a pair of actuators - one to push and the other to return - to apparently control oil flow.
Since I have NOT closed the front cover, I would like to leave the oil gallery to this point open and not have to rely on splash lube of the OMP drive shaft. I intend to purchase the adapter from the vendor listed on Tracy's site to feed 2 cycle oil to the OMP and so any excess flow from the engine oil pump into the gallery will simply end up in the pan. (at least thats what I am thinking).
What is the procedure for controlling the electric actuators on the OMP. In the absence of a VERY simple solution, I would like to entertain the possibility of placing an insert in the "actuator chamber" to hold the round "actuator plate" in a high flow position (the equivalent of "wiring it open"). Who has the skinny on the electric OMP and what would be the best course of action if I choose to actually utilize these pumps.
By the way, break in/initial startup would be with premix and not depend on the OMP.
Dave Staten
Dave,
I am the fellow with the OMP adapter for two-stroke oil. You are right with the oil feed to the pump. The arrangement of the oil feed provides very little pressure to the OMP inlet. All Mikuni OMP are of the same design and were originally developed for gravity feed only. The pump itself is a positive displacement pump with controlled piston stroke. The oil flow is controlled by the engine RPM and the piston stroke, where the piston stroke is changed with the stepper motor. On the GEN2 engines, the piston stroke was controlled by a linkage with the throttle shaft. MAZDA's intend apparently is to increase the oil flow with power setting, which is not necessarily correlated to the throttle position.
One more thing, if you want to retain the OMP make sure you also have the injection valves on the rotor housings and have them hooked up to the intake vacuum.
Richard Sohn
N-2071U
Homepage: http://www.flyrotary.com/
Archive: http://lancaironline.net/lists/flyrotary/List.html
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