I am thinking about using the RA OMP adapter to run 2 stroke oil, and I was wondering if anyone has had experience using it on a S4 turbo, and how they setup the 2 stroke tank. Any issues with colder weather, do I need a pump or will gravity feed be ok.

 

I was going to use this with a gravity feed reservoir then decided to keep it simple and premix my fuel. I did order the parts then sold them after changing my mind, everything looked high quality. Gravity feed should be fine, just make sure the tank is well above the metering adapter. You'll want to make sure the system stays clean and free of water or else it could clog/freeze, but that shouldn't be hard to maintain.

 

I'm satisfied with my RA adapter after 2+ years. Fabricated an aluminum reservoir for it and it's gravity fed, but it doesn't have to be. However it would be more difficult to prime the feed line if you chose the non gravity feed route, but not impossible. The metering oil pump is a pump, so I don't know what you mean buy that, and it will draw oil from lower levels. Yes I know first hand.

 

Good feedback on this. I'm looking at running around 2oz/gal whenever I put my NA back together and am torn between the adapter or a block-off plate. Has anybody out there used one on an NA application? I don't imagine I'll be able to gravity-feed my ratio without big lines, but if I can, it would be nice to know.

Thanks
Michael

 

To give an idea of how well the pump draws oil, -regardless of where the reservoir is located- it will draw a vacuum in the feed line and reservoir strong enough to cause cavitation and even collapse the feed line in on itself. I drilled a 1/16" hole in the fill cap on mine and no longer have cavitation issues, you could simply use a vented cap made for such situations.

on a side note the omp does not put out nearly 2oz/gal

 

What size line did you use for the feed line? And material?

 

Which is exactly why I plan to premix or find an alternative than CAN move that ratio.

That being said about the vented cap, Does having it vented compromise the amount of oil that sees the engine? What ratio do you run?

 

2oz a gal is a **** load of oil what do you plan on doing with the car?
I have a RA set up, i dont like filling the reservoir and i dont want to install a large tank. Would be good if the washer tank could be used

 

The intent of the RA OMP is to feed the oil through the stock oil injectors, not the fuel lines. I don't think oz oil per gallon fuel is an applicable metric for this.

 

I'm sorry guys. I do mean to say I plan to run EITHER the adapter which I understand uses the factory oil injectors, OR premix. I'm just trying to figure out which will be better for me.

Does the RA adapter move more oil in x time into the engine than the stock OMP?
Does it make a difference if the adapter is gravity or pump-fed?

My goal with it would be to match a premix quantity of 2oz/gal, which I'll have to do some math to figure out what kind of flow I get through the oil injectors with the OMP, and if I can use the RA adapter to prevent annoying fuel mixing, I would like to.

Sorry for the confusion!

 

Your decision does not involve an arbitrary premix ratio, what you need to decide is whether you think premix or the OMP provides the best result.
That debate has gone on long and hard but once you decide the rest is easy.

If you premix, use any ratio you like.
If you go with the OMP, it's just gonna do it's thing; all you're doing is changing it's supply, not the pumping capacity/efficacy.

 

NativeBeggars, you're thread jacking.

It's clear the original poster is already familiar with the mechanical workings of the RA adapter. If you knew what the RA adapter was you wouldn't be asking silly questions along the lines of its flow. Not only that, his car is turbo and he isn't insisting nor concerned about running absurd amounts of premix on an N/A. Most the rest of your questions had already been answered within this very thread.

raksj04 I can't remember the feed line size, i used whatever fit the fitting that comes on the adapter. its been awhile and cant remember the material either, but anything compatible with gasoline will work.

 

Mine works off throttle linkage, like the stock s4 set up
Havent hooked it back up since i changed the UIM/throttle body set up bit the guy i got the tb from used to use an adapter too he was able to use a bicycle cable for the linkage

 

For a tank you might watch e-bay for snow mobile 2-stroke oil tanks. They are often inexpensive and many come with low-oil level switches which would be a useful capability.

 

i thought about this and was planning on using the old sub zero start tank as the oil tank and re-routing the lines.

i like a stock look

 

I use a outdrive tank, its not nearly big enough

even a quart tank is not that much oil and it takes up a good amount of room under the hood.
I liked the idea of throttle controlled oil injection but it might be something I just get rid of

 

Well Rob, your statement would be accurate if you had ANY knowledge on any part of my build. Also, I'm sure if raks already knew, he wouldn't have started a thread on it. Honestly I don't care if you think asking about flow is a silly question. Even in other cases aside from mine [where my rotor housings do the talking on how much premix I need], the RA adapter is its own piece of equipment altogether with different properties. If it is only marginally better than the factory OMP [mine is actually S5], then it's not worth the money for me, which is good info to have. This thread is about effectiveness of this adapter in warm or cold situations and whether or not it's a good alternative to premixing - which is what I need to know. I don't see how I'm thread jacking, especially when I have been in many other relevant threads seeking this info.

I do like the idea of using the subzero tank. Being in Florida, it doesn't get used very often...

 

native- are you talking to me? Where was I discussing flow, accusing you of thread jacking, or deterring your project?
All I said was 2oz per gallon is alot of oil, not sure why you found that statement so insulting? its ALOT of oil I know of 600-800hp rotaries that use that much pre-mix

 

I understand it is a lot. I'll be running my 3mm RA Super Seals on refinished housings with no OMP. I'm just as interested in this adapter as the OP is. Anyway, discussing this is thread jacking on both our parts in itself.

Does this discussion have to stay specific to S4 turbos? I just don't think it's necessary to start another entire thread to ask the same thing about a different series NA.

 

One of us is confused and I think it's you.
The only thing that adaptor does is change where the pump pulls oil from...it isn't going to be "marginally better" or any other kind of better besides the type of oil the OMP injects.

I don't know of any way to change the flow of the S5 pump, so you'll be getting the same amount of oil injected in the same places, it'll just be 2-stroke instead of engine oil.

If you're dead set on a specific ratio, premix is the only way to go.

 

Australian guy made an electronic OMP controller looks really cool im still debating it just for the cool factor alone
The Electronic Oil Metering Pump Controller Project

Btw- my post before this i meant to say i know high HP cars that DONT use that much pre-mix

 

Sorry, guys. I was confused. I didn't think the adapter used the factory pump to just pump 2-stroke from a reservoir. Looks like premix and a block-off plate it is. I knew what you meant, Rob. My engine will require that amount based on my seal setup, porting, and me being NA.