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From: "Richard Sohn" <unicorn@gdsys.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>,
	<Dastaten@earthlink.net>
References: <list-606676@logan.com>
Subject: Re: [FlyRotary] Oil Metering Pump... again
Date: Thu, 13 Jan 2005 22:01:13 -0800
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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


>
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