Jump to content
SAU Community

1995 R33 Gtr Oil In Intake Pipe

judasentinel

By judasentinel,
in Engines & Forced Induction

 Share

Recommended Posts

judasentinel Explorer

judasentinel

Posted
Posted

I have a 1995 R33 GTR, and have been noticing oil coming into the intake pipe between the rear MAF and the rear turbo.

Someone suggested it could be from the exhaust crankcase ventilation (PCV) connected to the rear intake pipe, so I installed a catch can between the pCV and the rear turbo. However, the oil is still showing up in the rear MAF intake hose. I see oil coated on the turbo side of the MAF.

I have twin BOVs recirculating back to the Y pipe between the turbos, and when I rev the engine, I can see the air coming back out of the rear MAF (and not the front). The front MAF and turbo intake pipe are clean, which makes me think that the oil might be coming in from the rear turbo. This theory however, seems to suggest that the rear turbo may be leaking and blown.

However, the car boosts fine, all the way up to 1 bar without any hesitation. If the rear turbo was blown or had issues, would the car still boost? There is no oil leak under the car, and no black or blue smoke coming out of the exhaust. It idles fine as well.

I am totally stumped. I dont want to push the car if the rear turbo is blown, because some people have suggested it might be, but then others say that if it were, I wouldnt be able to boost the car to 1 bar.

Any ideas or suggestions to check?

Please help me as I want to make sure that the car is fine.

Thank you,

Munib

Link to comment
https://www.sau.com.au/forums/topic/459082-1995-r33-gtr-oil-in-intake-pipe/
Share on other sites
djr81 Grand Master

djr81

Posted
Posted

The blowby that gets sucked out of the head by the turbo (As opposed to the drivers side which goes into the engine on over run) goes to the rear turbo. This is almost certainly what you are seeing. Usually it ends up dripping out of the bovs. Even the crack pipe priced Nismo catch can doesn't stop it from happening.

judasentinel Explorer

judasentinel

Posted
  • Author
Posted

So how does one discern if it is the blow-by oil or the turbo is shot/leaking oil from the compressor side? If there is a compressor oil seal leak, will it also go into the intake piping? If so, how do we determine what is actually happening without removing the turbo piping?

Also, if there is an exhaust oil seal leak, will that also cause the oil to come up front of the turbo towards the compressor and go into the intake piping?

Surely, there would be a way to identify if the oil is from the blow-by or the turbo oil seal leak....?

judasentinel Explorer

judasentinel

Posted
  • Author
Posted

In addition to this, I do not see any oil at all in the catch can....maybe a tiny droplet, but that's all. And while the car is running OR I am revving the engine, I do not detect any suction from the catch can into the hose I am running to the rear turbo-MAF intake pipe. If this means the turbo is not spinning, it wont be sucking in any air from that hose, could this also be causing the recirc from the BOV to come out of the rear MAF? When I let go of the accelerator, I can see air/oil blow out of the rear MAF filter. This has me perplexed.

judasentinel Explorer

judasentinel

Posted
  • Author
Posted

If it is just blow-by coming back from the BOVs, and oil is returning with it, why is it escaping though the rear MAF only, and out the rear filter, and getting sucked in by the turbo since the whole point of recirc is to keep the metered air within the intake system?

I dont know if what I am saying makes sense....the BOVs recirculate air, it comes back into the MAF-turbo pipes (through the Y-pipe that connects to both turbos), and ideally, should at stage be sucked back in by the turbos. Instead, it is escaping out of the rear MAF...

fatz Grand Master

fatz

Posted
Posted

If it is just blow-by coming back from the BOVs, and oil is returning with it, why is it escaping though the rear MAF only, and out the rear filter, and getting sucked in by the turbo since the whole point of recirc is to keep the metered air within the intake system?

I dont know if what I am saying makes sense....the BOVs recirculate air, it comes back into the MAF-turbo pipes (through the Y-pipe that connects to both turbos), and ideally, should at stage be sucked back in by the turbos. Instead, it is escaping out of the rear MAF...

That is just because of the stock setup it takes the easy way out

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing


  • Similar Content

  • Latest Posts

    • Black_CSR
      Wheel Sizes & Offsets For Skylines

      By Black_CSR · Posted

      ok so if i wanted to go 18's i would go for 8's  in front 30+ or 32+ off set at front and the back 9 would be ok? what offset should i aim for.. then can i do some  hunting for wheel rim choices..    If i get this - will this fit all around: Size: 18 x 8.5 +37 - n what tyres size tyre should i get for front n back?  
    • GoHashiriya
      From Japan and back to Europe, my sh*tbox R34 GTT

      By GoHashiriya · Posted

      Absolute f*cking nightmare. I had to take breaks constantly, and I was always pissed off when I got home. The line split in Italy on day 2 (we drove from the Netherlands), lol. Driving any narrow European town was... well, sh*t.   Appreciate it man. Here, I'll just drop a favourite from the load I took on Saturday.   I'll update here when things happen with the car, the thing is, with stock power and almost everything chassis-wise taken care of, there really are no problems. 268,000kms now and counting.  
    • Kinkstaah
      WTB R34 GTR Guard Liners

      By Kinkstaah · Posted

      Ah! I actually managed to snag a lightly used set.... that aren't so suitable for me right now. They don't work on a GTT without some cutting or creative heat moulding. I thought about reselling them myself cause I didn't want to murder them, but it looks like I'm probably going to attempt to murder them/melt them because I may as well. @GTSBoy @PranK can somebody close this thread?
    • itsmeyo
      WTB R34 GTR Guard Liners

      By itsmeyo · Posted

      Hey mate,  I have a set, one is slightly damaged but wont be noticable once installed.  Shoot me a message if your still after them 
    • The Bogan
      NC MX5

      By The Bogan · Posted

      I couldn't wait But, the black constant tension hose clamps were too thick and there wasn't enough clearance at the T/B and I couldn't get it to seat properly, so I had use a silver one there I also added some 3" silicone over the alloy bit that goes through to hole on the radiator support as it looked like it was sitting on the edge of the hole in the radiator support, I never noticed a rattle or anything, but there was a witness mark It is basicly done, and I can live with the silver hose clamp at the T/B, I will get a black clamp for the head vent though where it is attached to the bulkhead fitting  It never stops...LOL, only issue now with the shock tower brace is it slightly touches the under bonnet liner now, if I leave it it will either wear some paint off the brace where it touches, or damage the liner, so I removed the liner to see what I have to work with, with the liner removed I have about 20mm of clearance, but sadly the middle part of the underside of the bonnet is only dusted with paint and looks crap, so I cannot have that, but.... as I have a roll of Carbuilders premium under bonnet insulation in the garage laying around that is only 5.5mm thick (we were going to use it on the boys Patrol, but he crashed the front of it a few months and it was written off, hence why he now drives my old Honda Accord Euro), I'll use the OEM liner as a template and get the Carbuilders stuff fitted up to cover that dusted paint up
×
×
  • Create New...