Doggtyred

Greetings, FNG here, first time poster. I hope I have managed to pick the right place for this question. I skimmed through the FAQ's and didn't see it addressed.



A little background: I have a 2nd gen/TII JDM engine that I have rebuilt and will be placing into an airplane application. Most of the others who are flying rotaries use premix, or have mechanical oil injection pumps with a take-off adapter and a separate two stroke oil tank.



The question:

I have obtained an electric oil metering pump for my engine, and it fits the footpad for it, so I know that it will be compatible. The electric OMP has two wire harnesses on it.. I did a "mild" disassembly to determine that one harness goes to one actuator, and the other harness goes to an opposing actuator. So.. I am presuming one actuator turns up the flow, and the other reverses that act.



Does anyone have any input on what the pin-outs are for the electric oil metering pump in order to be able to electricly control it based on engine power? I am using a non-stock ECU that does not interface with the OMP. The other guys who are flying have mechanical linkages and either "wire" them open, or have them linked to the throttle.



My mode of operation is primarily going to be idle on the ground, Wide Open Throttle for takeoff, climb and 75-80% power cruise for 2-3 hours, then a reduced power descent and landing. I am looking at being able to open up the flow for high power settings and slow it down for idle/low load ops. If it is more appropriate to "shim" the pump's actuators into a set position, what would be the recommended setting?



Dave

j9fd3s

the omp is a stepper motor with a position sensor (think tps), you can do it but you need a something that will run a stepper motor to do it, this is why people shim it open.

cymfc3s

Its probably much easier to go with the mechanical OMP and simply run the control rod to the throttle body. Especially in an airplane, the less moving parts the better. The mechanical pump will never fail.

bumpstart

bump

1st time poster also



a bit late for you maybe



http://www.youtube.com/v/NkoOOeufXvg

the vid was using pots that we set up to emulate the TPS and the half scale OPS

( oil pump position sender )



here it is all hooked up-



( the trim being operated here is for the speed of the process loop )

that's the real TPS and OPS and motor

the chip that is running as a row of darlingtons is a little overloaded in this example

as it was a beta test of the logic, and not really for the drivers

( was a always expecting to need to bring in more than 1 amp circuit )

so the real deal will have dedicated darlingtons and heat-sink, and this chip will merely drive them under minimal load





this example is direct relationship, TPS for OPS

but final example will have output modified by rpm and load as well

bumpstart

http://www.youtube.com/v/rBl-M5lke_Q

after much mulling over the issues

the answer to a ready made display jig

was solved with aussie inspiration, a nail, a screw , bailing wire and eraser

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