cabaynes

iTrader: (4)

I had some issues with the previous set of turbos on my 93 Base so i removed them and swapped on a new set. when i removed the original pair, i noticed that when looking into the turbo exhaust manifold, the exhaust inlet to the secondary turbo was SOAKED in oil, meanwhile the exhaust inlet to the primary turbo was dry as a bone... You can kind of see it in the picture below:

https://www.rx7club.com/attachment.p...1&d=1208990821

So I put on a new set of turbos and I'm getting the same issue. The car smokes a lot on startup, oil smoke that I had attributed to turbos but now I'm thinking that there may be a problem with the OMP or the Oil Injectors on top of the motor that is causing oil to leak into the engine while it's off.

My question is, why would there only be all this oil built up on the secondary exhaust inlet? My theory is that because I haven't really gotten into 4500+ rpm range that the oil building in my engine and getting pushed through the exhaust is burning up in the primary exhaust inlet because it is always open, but the oil is building up in the secondary turbo exhaust inlet because the flapper door is keeping that shut while the secondary turbo is not being used. This would make sense because the past 5 times I turned on the car or so, I just moved it around the driveway and did not even get close to opening up the secondary turbo.

My BIGGER question is: Where in the heck is all this oil coming from inside the engine? When I start the car there is a TON of oil smoke, and I know it's not from the turbos, its most definitely coming from inside the block, out the exhaust manifold and into the turbo manifold. Is it my OMP or Oil Injectors, or what I missing?

Thanks if you actually read all that!
Charlie

Rotors R Cool

If the car is smoking and your low on oil all the time... you have a possible engine failure... I'm not a professional rotary mechanic but I'm thinking your oil control ring is gone or fucked up... does the car run funny? with that much oil in your combustion chamber, it has to be running funny...

IDK much about the capability of the OMP but I doubt it even has the ability to spray that much oil...

If it stops smoking when your warmed up then its possible that your oil control ring expands or does something of that sort which causes it to seal properly when warm... Either way if there is an oil leak that bad, then you've got some oil pressure issues because of it.

cabaynes

iTrader: (4)

I was just searching and reading about the oil control rings, but the car only smokes for about 5-7 minutes on startup and then it clears up. After the smoke burns up I can drive it and rev it fine with no smoke. The car aslo idles fine and revs normal even while smoking.

Also the motor is 100% stock

drew32

I can't believe your actually working on your red one. Bout damn time!

Rotors R Cool

Try letting it get cold and then turning it on and driving immediately while it smokes. Don't boost it while it's cold but just drive around and try keeping a constant load on the motor and feel closely for any jerks or tugs like misfires. You might want to run the RPM's a little high when you do it to get the oil pressure up but accelerate slowly so you stay out of boost (which might be a little hard to do with sequential twins that spool that quick).

Regardless of what happens I would get someone to look at it.

Due to the simplicity of the rotary motor, the only thing I can think of that would leak that much oil into the combustion chamber would be those oil control rings...

cabaynes

iTrader: (4)

well besides the oil control rings i was thinking it could be the oil injectors on top of the motor because if the check valve inside of them fails they will leak oil while the motor is off. this could be why it only smokes on startup (burning off the leaked oil) and not constantly while driving. if the oil control rings fail I was under the impression that it would smoke almost the entire time the motor is on?

Scrub

iTrader: (25)

Check your e-mail captain.

Six Rotors

iTrader: (17)

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The check valve is there to prevent oil being sucked into engine when a vacuum exists.So you would expect to see smoke mostly when decelerating and not boosting.
Leak down from the the oil injectors when the motor is shut off is a non starter in my view.
What do the spark plugs look like in the rear rotor,and compared to the front?

cabaynes

iTrader: (4)

Yea after reading more about the check valve in the injectors I understand it now. I previously was under the wrong impression about how it was set up but thanks to Damon's post a while back I get it now

I also checked the PCV and it is operating normally.

I crawled under the car yesterday and looked at the new(er) set of turbos on the car, they look exactly like the old set. There a ton of oil build up around the secondary turbo exhaust inlet and oil appears to be trying to seep through the joints between the turbo and turbo manifold. I also took off the cover to the wastegate and saw some oil, but then I removed the single 12mm bolt that is on the bottom of the turbo manifold towards the rear turbo and it was COVERED in oil all the way up and down, I dont know how this bolt would get so covered so quickly, the car has only been run for about 15 minutes now since the new turbos have been on, and only at idle.

I will check the plugs tonight, among other things. I'm about to just pull the motor and go from there!