I have a 94 Touring RX-7 with a RX-7 store street ported motor with about 7-8 thousand miles on it. 99 spec twin turbos with the same amount of miles on them. A PFC, 1300 CC secondary injectors. running 12 pounds of boost. I have been driving the car daily having no trouble at all and all of a sudden after doing a oil change, (put too much in by mistake). it would start blowing out ton and tons of white smoke as soon as I hit 3500 Rpm and above? I am honestly not sure at what it could be. We checked the intercooler piping and they are clean so there is no sort of turbo oil leak as far as I know? Does anyone have any ideas? This is basically a new thread from earlier explaining everything more clearly I guess and updating.

 

It also happens hot or cold doesnt matter on temp. I removed a spark plug to check it and it was covered with burnt oil. A guy around here thinks its a bad oil seal in the engine? Any suggestions would be greatly appreciated. Thanks everyone.

 

What does the white smoke smell like?

General rule, white = coolant; blue = oil; black = unburnt gas

 

Really bad. its a whitish blue smoke? is oil a whitish blue or straight blue?

 

In my experience, oil tends to be more of a blackish blue.

 

Rob - if it was a bad oil seal i would think you'd be losing oil too, kind of like what happened when my first motor was messed up. If I'm wrong some one please let me know.

 

I will check on that. To make sure. I dont know if its losing oil or not. It smells like oil. Any suggestions on what it might be? and if for some reason its a bad oil seal. Anyone know a good shop in atlanta or a good shop in general? Perferably one that warranties its work? is gotham good? This of course is a worst case scenario.

 

But besides that up till now. The car runs great. It has great power and had no problem with overheating at all. Its absolutly awesome. Thanks again dude. Did you ever find those coilover wrenches? Just wondering if you did.

 

The mechanic that did all the work on the car suggested that there might be gunk or something built up in the cat. So I took it out and drove it for about 20 minutes or so and the smoking stopped completely until a day later. I was told it was again, gunk in the engine. So as soon as I hit 3500 rpms it got the cat hot enough to actually burn out whatever there was in the cat. It is oil that is being burnt off. Being a blue white. I also got a suggestion that I might have a dry oil injector? And when that injector starts going again it would put in tons and tons of oil, causing the clouds of smoke. Is this a possible sounding scenario or is it something else? How would I go about checking the oil injectors and where are they located? I probably sound like a complete newb. Is it possible the engine is fine and I am just burning excess oil that I put in out of the cat that built up there?

 

if it was a cat there would be no unburnt oil on the plugs..

pull off the turbo charge pipes and place a filter on the intake elbow pipe, clean the plugs of any oil/carbon and take the car out for a drive, if it still smokes then remove the plugs and inspect them, if there is fresh engine oil on one and not the other or on both then you have internal oil seal issues. if they are clean then remove and inspect the downpipe, if there is fresh oil in it and not in the exhaust manifold then you have a faulty turbine(turbo hot side) oil seal.

your mechanic is not very bright, you may want to find another.

 

what are you doing boosting when cold? if so i vote for coolant.

 

It also doesnt matter if I boost or not. I could be on just enough throttle to get to 3500 Rpms and still would do it.

 

there was no unburnt oil on the plugs? There was a little black on the plugs but no unburnt oil. I am sorry for not being more clear with that . But thank you for the suggestion dude.

 

well then i would probably suggest pulling the turbos and inspecting them and the manifold, more than likely you have a CHRA carbon seal failure on your secondary turbo. if you see a any oil film inside the turbo ports post turbines then you will need to have to figure out why the seal blew prematurely.

this issue is generally caused by missing or modified oil restrictors in turbos after having been rebuilt or engine oil pressure modifications which push too much oil pressure to the turbo and force the oil past the turbine seals. no stock setup engine should ever see over 100PSI of oil pressure under load after 3k RPMS and 50-55PSI MAXIMUM at low RPMs when the turbos are not loaded and spooling yet i constantly see people forcing the idea that more oil pressure is better around these forums, even from builders themselves.. this may not be bad for naturally aspirated engines but for turbo applications you have to remember the turbos do not take well to high oil pressure levels.

 

so a 60 psi oil pressure at around 3000 is a bad thing? but considering the smoking stopped then started again? Would that still be the turbo possibly? I had a guy suggest a dry oil injector?

 

Im gonna be calling charlie at mazcare on monday, and hopefully taking it there for him to look at. I hope. I hope for the best.

 

What kind of oil did you use dino or synthetic? I know some carbon seals can be deteriorated by synthetic oil which could be your prob. I don't know about the 99 spec twins though.

 

I only use castrol gtx 20w-50 conventional oil. No synthetic at all.

 

I havent had a chance cause of work and school to get it to mazmart yet. But a few days after it started smoking the first time. I took it out at night and wanted to see if it would stop smoking. After about 5 to 10 minutes of smoking and everything, it stopped smoking. Again I have not had any loss of power, boost, and I havent really noticed any loss of oil either. But then a day and a half later it started up again. I decided to take it to work today to see if it would do the same thing again and stop. on the way home I brought it up to the 3500 mark for again about 5 to 10 minutes and it stopped. Its a whitish smoke with very little blue mixed in. Any suggestions on what it might be? Could it be the cat? Just providing an update. even if it doesnt smoke at all Im still going to go take it and get it completely checked.

 

bump

 

Mine was doing something similar... found oil in the intake piping... found it originating from the secondary turbo.

 

was one side of the intercooler clean and the other side having oil? Because there is no oil in the intake piping as of a few days ago? I also took it to Mazcare today and Charlie was able to look over it for a few minutes. And couldnt get it to smoke at first but then as I was driving away, the smoke came took it back and he said it was definitely oil. I am dropping it off to them thursday to be able to find out exactly whats going on. Also found an exhaust leak coming up into the passenger compartment! But Thats where I am going to take the car. Charlie was very nice and I would suggest taking your FD to them. Great guys and a little dog to bark into your exhaust if your looking for a rotary mechanic in the Atlanta area. But back to the turbos. Were you losing boost or anything like that?