Anyone have the specs for OMP stepper motors?

[ianelvar]

For a project I\'m working on. Looking for any information I can get hold of, as I want to build a standalone driver for an oil memtering pump.

Anything you\'ve got would be much appreciated :Thumbsup!

[Prof]

They look like a standard stepper 7.5 Degree - 4 wire drive

[MikeLMR]

the maps I have seen on my haltech ECU are based on the TPS position and look very linear and uncomplicated.

[shaunwil]

Rotary aviation do an external supply pump for the oil pump. I think it is very linear to revs !

Shaun

[ianelvar]

Cheers guys, that\'s exactly what I wanted :wiggle

Is the position sensor there to simply let the ECU know that the thing is functioning correctly, or does it play a larger role in oil metering?  I can\'t think of a reason it would, or there wouldn\'t be much sense in using a stepper motor. The sensor looks like a 360 degree potentiometer from the wiring diagram.

I\'ll try and get a scope to it while it\'s running on the stock ECU and see what goes on.

Do the old school mechy ones work on revs and TPS, revs alone, or TPS alone?

Thanks again

Ian

[Prof]

Cheers guys, that\'s exactly what I wanted :wiggle
 
Is the position sensor there to simply let the ECU know that the thing is functioning correctly, or does it play a larger role in oil metering? I can\'t think of a reason it would, or there wouldn\'t be much sense in using a stepper motor. The sensor looks like a 360 degree potentiometer from the wiring diagram.
 
I\'ll try and get a scope to it while it\'s running on the stock ECU and see what goes on.
 
Do the old school mechy ones work on revs and TPS, revs alone, or TPS alone?
 
Thanks again
 
Ian

Ian - I think they work off an actuator rod connected to the throttle body, but pump driven by engine RPM - so somehow possible that the oil amounts are a function of both RPM and Throttle position.
 
Your correct about the position sensor - it\'s just a pot - I think it\'s purpose is in checking the metering point on the OMP and if it doesn\'t register correctly the engine is put in limp home mode.

[ianelvar]

Perfect, I think that\'s all I need to be going on with. Cheers dude :Thumbs-up

[Prof]

Came across this a while back when looking into Premix - describes the OMP systems a bit :
 
http://fc3spro.com/TECH/FAQ/premix.html

[shaunwil]

Upto the 2nd gen 13b EGI the pump was a mechanical one so only ran off revs.

Shaun

[MikeLMR]

yes but the linkage to the throttle varied it by how far the throttle was open as well. There are specs for the 1st gen in the haynes manual (for checking purposes)

[shaunwil]

Ah right, Im going to need to investigate this for my new engine..... Going to use the double barrel 12a one on the 13b with a home made pickup on the new throttlebody.

Shaun

[MikeLMR]

this is the linkage from a 6 port (converted to be actuated by the spindle on a 48 dellorto)

[shaunwil]

Cool

Shaun

[ianelvar]

Thanks again. It looks like it\'ll be fairly easy to drive, I just need to work out how it\'s mapped.

As an aside, do many people convert the OMP to inject 2 stroke oil from a seperate oil reservouir?

[Prof]

I\'ve never seen that done over here - but the yanks have a neat little gizmo that fits between the OMP and the block, effectively prevents engine oil from getting to the OMP, and a nipple on the device allows a secondary oil source just for the injectors on the rotor housings.
 
linky here :  http://rotaryinsider.com/rx8-93.html