No-Pistons-TT

Ok so i pulled my elbow off the other day and noticed there was an oil build up in my intake. I also blow smoke under hard acceleration out the exhaust im thinking it was the set of used turbos i installed leaking oil into the intake does that sound right>??

crazyrx7

If you have your stock blow off valve still hooked up to your intake then yes there will be oil in the intake area. If there is oil in the intercooler piping then your turbos are starting to leak oil hense the smoke on hard acceleration.

R.K.

No-Pistons-TT

ya i figure its my turbos damit oh well might have to get the bnr's or go single

Sled Driver

iTrader: (9)

What does that have to do with oil transfer??? There isn't a oil line hooked up to the BOV. What is the source of the oil is the question. No BOV contributes oil to the intake period.


Also NOT TRUE. There is a oil breather hose from the filler neck to the primary turbo inlet that is known to deposit oil into the intake.

Clean out all oil contamination fron the intercooler & piping, & elbow (solvent tank).

I would disconnect the oil breather hose from the filler neck & install a plug to the primary turbo line. Let the breather hose from the oil filler neck vent overboard (for the test period only). For a pemanet fix get a oil catch can.

Drive around & see if you still have oil contamination. Hard cornering will cause oil to be sucked into the intake from the oil filler breather line.

I bet you wont find any oil in your intake.

VegasFD

Small amounts of oil in the intercooler/intake piping is normal. It's when there are large amounts puddling up that you have to worry about the turbos. Clean the oil out, drive for awhile and see how quickly the oil returns. You should be fine.

Sled Driver

iTrader: (9)

You get "large amounts" of oil in the intake from the breather line.

If you do any lapping days you would be shocked at how much oil is sucked through the breather .

Add R compound tires & race brake pads & it gets much worse. I had to add a catch can & modify my oil filler neck to keep the oil out of the intake. Prior to that I could pour oil out my intercooler. Now after 3 to 4 30 minute sessions I only lose 1/2 quart into the can.

Plus another thing to check is your oil quanity. If it's overfilled you will get more oil transfer through the breather.

Remember IM talking about the oil breather hose from the oil filler neck. Not the PCV hose. I removed & plugged my PCV years ago.

My point was to "VERIFY" where the oil is comming from. Don't just assume it's bad turbos

crazyrx7

Well your stock bov is plumbed into just before the Y pipe. If your turbos are leaking oil then when the bov blows off back into your intake it will take some oil with it. But you probably already knew that.


R.K.

No-Pistons-TT

thanks alot guys ill think ill just buy new turbos

shawnk

Coming soon to a rx-7 forum near you -

"I have new turbos but am still getting oil in my intake!"

Why dont you just buy a new FD? That could possibly solve the problem also.

Larz

+1
if the turbos still boost fine, don't replace them. And if they don't boost fine, fix the control system.

spoolin93r1

sometimes the oil injectors blow the seal inside them, which bypasses some oil into the vacuum line that runs into the primary inlet. take off your y-pipe and see if it's only the primary that has oil in it. if so, that could be part of the problem. the injectors are extremely cheap from malloy if you just want some reassurance

Sled Driver

iTrader: (9)

Yea? Well the oil breather line is connected to the elbow between the airbox & the primary turbo compressor inlet.

That is Waaay before the Y pipe. My point was what makes the stock BOV so differant that it is the only one to leak oil out the vent.


YOU NEED TO FIND THE SOURCE OF THE OIL...........


Your concerned due to smoke under hard acceleration?????
I would be more concerned if it didn´t.

Do what you want hoser, but your gonna be dissapointed when your "new turbos" are also just as faulty.

Sgtblue

iTrader: (16)

+1 on all points. The primary inlet is the only place I can think of that will have constant vacuum. I'm guessing that ANY oil that makes it up the filler neck, from over filling or from fast corners will be sucked into the intake. I panicked the first time I found some oil there too. But that was over 20k miles ago and my turbos are still fine.

Newsome79

iTrader: (3)

I just found oil in my intake after purchasing a touring FD about a month ago. I seem to have two issues one is I went from a car with fairly silent transition from WOT to off the throttle to one where I can hear the big whoosh of air that I seem to hear on most turbo motors. The second is when I began checking hoses thinking I was having some sort of leak I found oil in the Intercooler, Intercooler piping and intake elbow. I do not see any boost creeping or lack of boost. The PFC shows that I am getting the amount its programmed for and the car is accelerating with the same eye sucking insanity as it did when I bought it. The only mods the car has is 3mm apex seals (10k on motor 77k on turbos and chassis), downpipe, and the Power FC which i believe still has the default programming. I did autoX the car a few weeks ago so I guess thats where the oil could have come from (had alot of left handers). Do I have some sort of leak or pipe loose that I can not see from a visual inspection under the hood. Appears there are alot of hidden pipes going here and there. I am a newb but a very quick learner. School me on the working of the stock turbo system noises and any other oil in the intercooler issues.

Sgtblue

iTrader: (16)

If you just hear it off-throttle the first thing that comes to mind is that your blow-off valve (BOV) had been plugged in, but came loose. Especially since you indicate that it's similar to what you hear on other turbo'd cars. If so, it's harmless.
If you haven't already, download a copy of the FACTORY SERVICE MANUAL from the sticky at the top of this section for more info on all those hoses.
With 77k on the turbos, oil in the intake track might be something to keep an eye on, but it doesn't necessarily mean something is about to fail.

Newsome79

iTrader: (3)

Ok, I am looking at the system schematic and it appears I have two valves that release pressure on the compressed intake air side of the turbos. In Mazda terminology one is called the Charge Relief Valve and the other is called the Air Bypass Valve. The Charge Relief Valve is just before the Y connection on the secondary turbo outlet as listed previously in this thread. The Air Bypass valve is connected just before the intercooler. I get the BOV sound without revving past 4000 rpm does that mean the secondary outlet should not have pressure yet or is the turbo accually building speed and pressure below 4000 RPM preparing for the transition.

“When you eliminate the impossible, that which remains however improbable must be the truth.”
This car reminds me on this quote by Sir Arthur Conan Doyle (Sherlock Holmes). A constant mystery finding the little things that annoy us.