Hey DdoubleR, let me know if you find a stash of these somewhere. Ive been scouring ebay for the past year and even contacted RotaryAviation (the manufacturer). I have a GSL-SE 13b and live near Pottstown.

 

I’ve been looking for one of these for 2 yrs smh

 

How different is the 12A to the 13B one? i have a 12A one i am no longer using.

 

@kutukutu1
The 12A and GSL-SE OMP's are not interchangeable. Different bolt locations in relation to the "drive" shaft. The omp delete plates are also different for the same reason.

12A top, GSL-SE 13B bottom:

 

Thanks! Appreciate the pictures for clarity.

 

What's the deal with these? What makes them so special?

 

They were made to replace the stock OMP and pull 2-stroke oil from a source other than the engine oil. You replace the stock omp with this and mount a bottle of oil under your hood so you're not sucking dirty used oil from your engine.

The stock system is the easiest for the average car owner to live with day to day. Just let the omp suck your oil from the engine and never wory about it (!). It actually works fine for 99% of cars.

But lots of rotary car owners prefer to pre-mix and leave the motor oil in the pan where it belongs. I'm one of those guys and removed my stock omp(s). I pre-mix every time I go to the gas station. Better for the engine (in our opinion) but a royal PITA.

This device fixes that, so you have a separate jug of dedicated 2-stroke oil under your hood and don't have to F-around at the gas pump.

It was actually designed and marketed for aviation purposes. The inventor and producer is a pilot and decided it would be safer to suck the lube from a dedicated tank, than to suck his precious engine oil out of the engine while flying cross-country. He told me he stopped making these because nobody is using 12a's and early 13B's any more for light aircraft: All the remaining rotary aviation guys are using the more modern engines (FD's and RX8 motors) and he still makes those. He told me to make ONE for me would cost $500 -800, where he used to be able to have a 100 made at a time for about $30 each from the machine shop. But the market dried up and it's not worth it to make them anymore.

Sad, like so many other makers of parts for our classic cars.

 

I see now, I use to premix on the racecar, All my street cars sucked up the engine oil, I would use the street cars to race myself or others anyway, so they always had fresh oil

 

I'm not OP but I'm very interested in your 12A adapter.

 

Hey, Sorry, some one already pm'd me for it. I plan on remaking the 12A adaptor and doing a batch run of 10 on my mill. Ill post back when they are done.

 

I just got the last 4 of these that Rotary Aviation ever made (for me!). Fit the GSL-SE and the '86-88 FC. Factory sealed with hardware, o-rings, instructions and a decal. $200 shipped.

 

so dose this mean you are selling the other 3? Or you just showing everyone? If your selling the person who started the listing would like one and I would buy one also. But if your just showing us that’s cool, any chance I could get one to copy? I have a sherline mill.

 

Hi drschwinn2002,
Sorry I wasn't clear (it was late). Yes, 3 of the 4 were for sale. The other will go on my car. @rx7milton and @Endefreshes7 have each asked for one. The last one is still available. PM me if your interested.

I think it would be great if you could reproduce these, but you might want to talk to a patent lawyer to make sure RA can't sue you for reproducing their design.

Max

 

Good thought on the patent situation. So far I found a patent for the actual omp, but have not found one for an omp adaptor.
Here's a picture of how it's going so far.

 

So they said they don’t want to invest in the minimum quality order from the machine shop at 50 units. I think it’s not something they would get mad at you producing. I talked to the person who can support supply and make the orders not the person who invented it. That person is a pilot and I’m not to sure he is into keeping it from the world. They said they sold 5 a year on average so that mean it took them about 10 years to sell the minimum quality order. Since then they supported a few generations of 13B

 

favorite part is the girls socks in the kitchen lol. Reminds me of my girlfriend she puts up with a lot of silly stuff like transmission parts in the oven and bearings in the freezer in ziplock bags. 2nd favorite part is the progress! Good job! Finally you didn’t hurt your self :-) my person rule #1

 

This is really good to know. Considering I am not a shop with massive overhead and I own the cnc, small batches make sense and would continue the support for the community. Plans if to get the initial time investment back for the 12a adapters when done and then get a batch of gsl-se done.

 

Hi all,
12A omp are done. You can pm me if you like one. Only made 10 and some have already sold, but If I have more request I'll run another batch.
Includes everything, omp, gaskets and bolts.

 

Hi again. I ran another batch of 12a omp adaptors. I still have a few left. Pm me if you would like one. Design for the gslse is done, just need to run the batch. Thanks.

 

Hello all again.
I haven't posted in a while.
Just want to mention that i have a few 12A and 13B Mechanical OMP adaptors from my last batch if anyone is interested.
Send me a PM.

13B

12A & Early 13B's