MX722

iTrader: (1)

A month or so ago I made a post asking what I should do about a large amount of blue smoke pertruding from my engine bay and exhaust. So I bought a rebuild kit from turbonetics for my 62-1. I had the turbo professionally rebuilt, installed. And then fired the car back up.

I started it, let it warm up for another minute or two, then pulled out of the garage into the front of the shop. Once I stopped, the car started smoking just as much as it did before the rebuilt turbo.

Not sure if it means anything, but where the turbo connects to the downpipe there is smoke leaking out of there. Also After the rebuild no oil was being thrown into the intake.

Anyone have this type of experience?

grimple1

iTrader: (1)

First, let it run for a good bit. Oil will stick around for a while until it's fully burnt off. If you have any that got spewed into your DP/Manifold, it'll take awhile for it to burn off. (let's hope that's the solution)

Something minor to check: Oil return line to ensure that it isn't bound up anywhere and everything is draining properly.

MX722

iTrader: (1)

It ran all total for around 7-10 minutes. I even took it up the street slowly so it may force the rest of the oil out under a small amount of acceleration.

I even checked the oil return line. I actually disconnected one side of it, started the car and shut it off quickly, and noticed oil had come out of it. So its working properly.

I believe I'm going to remove the shaft and propeller out of the turbo and create a block off plate from the hotside and plug the hoses. Then If it is still smoking, i'll have a much more serious problem

Mahjik

iTrader: (1)

Do you have a proper sized restrictor in the oil feed line?

WaachBack

iTrader: (21)

Make sure you crankcase is correctly vented.

Restric it. Start with a .100 restrictor and keep going down till it stops but do not go lower then .070

Run lighter weight oil.

Try those.

MX722

iTrader: (1)

What do you mean to restrict it?

Mahjik

iTrader: (1)

Some turbos require a smaller orifice in the oil feed to slow down the amount of oil it receives. If it receives too much oil, it cannot drain it out quick enough which can give symptoms similar to a blown turbo. Here's a thread with some info:

https://www.rx7club.com/single-turbo-rx-7s-23/size-3-4-6-turbo-lines-882882/

I'm not familiar with your turbo and whether you'll need a restrictor or not. You might post in the Single Turbo section.

MX722

iTrader: (1)

Ok makes sense. But wouldn't this be a problem that would arise from the original install of the turbo and not 10k miles down the road?

Mahjik

iTrader: (1)

I would expect it to be from the original install. However, even something like using a heavier oil will increase your oil pressure which can make it more noticeable or make it a problem. I would do a check to make sure you either do or don't need a restrictor; if you do, just make sure you have an appropriate size.

Did you run the car without the turbo on to make sure the engine wasn't smoking?

grimple1

iTrader: (1)

I've heard of turbos requiring restrictions after miles put on them. In fact, Sean at a-spec mentioned this to me in some PMs.

If it's a ball-bearing turbo it should probably have a restriction.. journal or other non-BBs probably should be ok w/o restriction.

milano maroon

iTrader: (1)

Oil in the exhaust can stay there for a long time which will cause it to smoke for awhile even though the original problem has been fixed.

The engine that came in my car had a bad oil control ring which put oil in the exhaust and caused it to smoke. Not trying to say that's your problem but if your old turbo allowed oil to get into the exhaust it could be awhile before it's burnt out. Took mine a week or so.

MichaelBrown

did they JUST rebuild your turbo, and reuse the same gaskets? or did they put new ones in?