I read-through the "OMP Declassified" threads (good reads if you are looking into this)

https://www.rx7club.com/3rd-generati...sified-892750/
https://www.rx7club.com/3rd-generati...art-ii-895388/
https://www.rx7club.com/3rd-generati...mikuni-897507/

I got my hands on a Mikuni OMP because I am running twins and the Rotary Aviation OMP adapter, and the Denso OMP wiring harness connector interferes with the mate-up between the flanges of the oil drain pipe and the spool piece of pipe when one is using a RA OMP adapter. I do not want this thread to be a debate on premix, OMP+premix, etc. Please relegate those comments to the existing threads on that specific part of this subject matter.

I wanted a "list of all the junk you need to run a Mikuni on the 93-95 engines," but no such thing seems to exist. This is my attempt at this project. Here are a few things I learned in searching through threads on the Mikuni OMP:

1. If you have the inclination (or ability), you can clock the Denso OMP motor to 90DEG or so, but this is labor intensive. I initially considered this because I have a spare Denso OMP, but realized there was more to it. Making alterations to components adds to points of failure that I am not competent enough to avoid.
2. The later engines that had the Mikuni also came with different oil injection nozzles and o-rings. The nozzle ports were smaller in diameter, which I read was a product of the intent to decrease emissions.
3. The Mikuni OMP operates at a different resistance range than the Denso. From the above sources, I read that this can be tweaked if one has a PFC (which one certainly should if they are at this point).

Here is the part where I ask the brain trust here for specific methods and details of running the Mikuni OMP. If you, dear reader, have successfully installed a Mikuni OMP, RA OMP adapter, and external 2-stroke tank in your 93-95 FD, I would like to know all the details of the install as well as the adjustments necessary in the PFC. If you know someone who has done this, please ask that person to respond to this post. I would like to turn this thread into a "how to" tutorial.

 

Man! Nobody! Maybe this is an abandoned or forgotten modification.

 

ptrhahn has run the mikuni OMP on his car for years. From what I remember, he did not make any special modifications to run it; simply operates it via the PFC. From past threads exploring the differences between the pumps, ptrhahn's Mikuni pump may be metering more oil at low RPMs than the Denso pump would, due to the Denso position sensor range being 500-1800 Ohms and the Mikuni being 500-3400 Ohms. He has not noted any ill affects from this that I recall.

Like you, though, I'm definitely interested in learning more about how to run and operate the Mikuni properly.

 

Also interested in seeing what is required to adapt and operate this system on a USDM FD.