I have a rebuilt streetported 12a. Its in an 85. I currently have the OMP wired wide open and have a 47 OER carb. I am in the process of turboing it. I will be running about 15 psi. Can i still use the OMP or will the boost overpower it and not allow any oil in? I was planning on premixing. If i do go that route what is a good ratio to use? Thanks!

 

I always run 1oz per gallon of gasoline w/out a omp. With the omp a lot of people do 1/2oz to a gallon.

 

i think you should always premix ... even with the OMP in place. Ask yourself what's the backup plan if it stops functioning while you're driving?


rebuild.

 

when using idemitzu it suggests 1/2oz to a gallon without omp

 

here we go again....



https://www.rx7club.com/showthread.p...e+motor+whales

 

haha I was thinking the same thing....as long as you're premixing whether it's 1oz per gallon or 1/2oz per gallon then you're still benefiting either way, if your spark plugs have a hard time with the mixture then obviously decrease the ratio accordingly.

 

Those old mechanical OMP's fail infrequently. the 89+ OMP's are the ones that have problems.

 

You should always premix, also, if you are throwing boost at it and running 3mm apex seals, I would go 2 oz/gallon.

 

2 oz/gallon ?!!?! What is your logic behind that other than the smoke signals that'd be coming out of the back of the car

 

block off omp on the engine front cover...1oz pg tcw3.

 

A good ashless premix oil will only smoke a little while the engine is cold. If you are running 3mm seals vs. 2mm seals, the seals themselves are 33.3% taller and require more lubrication against the housing. I've been running 2 oz./gal for a few months now with no problems..

 

i run 8oz per tank.

 

So what is the correlation between seal height and lubrication needs?

 

Here's the way I see it, I understand only the top of the seal contacts the rotor housing. The apex seals are the main contact point between the rotor and the housing, also the point of the most friction. The premix oil not only lubricates but draws heat off of the seal. The 3mm seal is bigger therefore it has the capability of retaining more heat, heat warps seals.

 

The few days i've been playing around with my car with a 1.5oz/gallon ratio it hasn't smoked any more than usual. A little bit at startup and like 30 seconds after that no smoke.

Runs fine i guess. Revs to infinity without a problem. Cold start is a bitch but that could be because i'm still on stock grounds and may be missing some due to what the previous owner put the car through..... Like, it'll sound like it's firing on one rotor for a sec and then the other will kick on over making me think the plugs might be a little dirty. It never did that when i had the stock omp. I do the 3k shutdown every time.

This problem does not occur when the engine is warm.

It may or may not be premix ratio related but i think i'll stick with the 1.5oz/gal so i KNOW my motor is well lubricated and can withstand me breaking everything i touch by beating the **** out of it.

 

So basically its whatever i feel is good cuz everyone seems to have dfferent opinions... also does anyone know if the stock omp will still push oil into the intake with 15 psi? it is a mechanical one....85. What is the benefit of ashless oil to a rotary? if its only to prevent smoking i dont really care. does it help keep things clean in the engine?

 

Synthetic? Less carbon buildup, resistance to thermal breakdown, more friction protection.......

I dunno. There's charts that say this and that and show bearings ran with synthetic vs bearings ran with mineral oil and it doesn't take a rocket scientist to figure out which bearing looked better but it's all relative. If mineral oil was crap then everyone using a stock omp on their stock, never touched 100k, 200k, or 300k rotary are doing something magical? Ofcourse these are usually n/a motors but it should put things into perspective.


MY REASON for switching was molecule tension/longer oil life. Oh and my omp needed parts and i didn't want to buy them so i blocked it all off. One less system to worry about.