Jump to content
SAU Community

Rb20 Oil Control

Luke HCR32

By Luke HCR32,
in Engines & Forced Induction

 Share

Recommended Posts

Luke HCR32 Collaborator

Luke HCR32

Posted
Posted

Currently in the process of my second turbo swap in 6 months.

My car has always used oil slowly and during the first turbo swap it seemed that it must be the compressor housing of the turbo leaking oil into the intake (fair bit of oil in intake piping from turbo onwards, little evidence of oil from cam cover breather to intake).

The car continued to use oil at the same rate with another factory RB20 turbo, now in the process of swapping for a high flowed 25 turbo it seems less apparent that the compressor housing has been leaking (oil obvious from the cam cover breather, less oil in intake piping overall, little to no oil in compressor housing)

The car uses bugger all oil in highway driving but plenty in hills thrashing, blows black smoke under heavy acceleration but not when I come off the throttle. Planning to do a compression test in the next few days, is a leak down test also necessary?

Cam cover gasket has weeped intermittently even after being replaced but never enough to drop oil in my driveway.

I'm running Penrite HPR10 15W-50.

Need to get this sorted as I'm pushing for 220 rwkW+ with the new turbo.

Another thread suggested cleaning PCV but didn't say how to do so...

Link to comment
https://www.sau.com.au/forums/topic/396637-rb20-oil-control/
Share on other sites
R31Nismoid Grand Master

R31Nismoid

Posted
Posted

140,000 kms, if that's the case what can I do to help it?

140k legit? Unless you've got verified service history who knows what it really is. Could be over 200k for all you know.

Get the motor checked Comp test & leakdown, not much you can really do until you know the results of where it's at.

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

    • Wazmond
      Stock rb25det neo questions

      By Wazmond · Posted

      Hows your intake piping? Are you still running stock? Having in the stock AFM position would mean, if the BOV was shut/venting out, it'd create the almost stalling kind of effect right // "the rich pulse behaviour" due to MAF thinking air is flowing ? But this would be better than having the bov in the stock position + MAF on/just before cross over piping right?
    • GTSBoy
      Stock rb25det neo questions

      By GTSBoy · Posted

      Essentially, yes. Although I wouldn't put the AFM on the crossover pipe. I'd want to put it into what amounts to the correct size tube, which is more easily done in the intercooler pipework. I bought a mount tube for card stile AFM that replaces the stock AFM - although being a cheap AliExpress knockoff, it had not flange and I had to make and weld my own. But it is the same length and diameter as the stock RB AFM, goes on my airbox, etc etc. I don't have a sick enough rig to warrant anything different, and the swap will take 5 minutes (when I finally get around to it and the injectors & the dyno tune).
    • Wazmond
      Stock rb25det neo questions

      By Wazmond · Posted

      So to summarise, the best thing to do is to move recirc to between turbo and IC, and maf on the crossover pipe. Meaning I'd need a recirc flange, drill a hole in the piping on turbo outlet area. And drill hole on crossover to fit/weld maf sensor? Either that or put the MAF on the turbo inlet right?  Is an aftermarket recirc/blowoff valve recommended? Do currently have family in Japan so could probably bring something back with maybe a cheeky lil SuperAutobacs run?
    • tsuokun
      Lets play a game - What is causing my oil consumption?

      By tsuokun · Posted

      Yep, so far most have said that it looks like corrosion on the wall from piston not moving. Which then has probably damaged the oil rings and caused those vertical marks. The longest the engine was still after the rebuild, was the winter of 2018 - 2019, plus the boat trip to Japan. When I shipped the car, it had normal gas in the tank but before that winter pause, it had E85 in tank.  In any case, even if either one of those was the cause, it happened close to 6 years ago and the car has been driven something like 30 000kms after the fact. Again, apart from the plugs and the dip stick, there is nothing in the way the car runs that would indicate what has been going on in the engine. I am going to consult a shop and ask their opinion, what would be the best approach. I do have some access to a garage I could use to diagnose further myself, but time is very restrictive. Might end up buying another engine that could be used while this one is being remedied. Without pulling the head, it will be impossible to find out if it needs another bore, but here's to hoping a hone would suffice.  Goddamnit, I would really have preferred this not happening.  
    • 25RBGT
      Got this r31 silhouette flood car to rebuild.

      By 25RBGT · Posted

      Boot is going to be replaced eventually. I just wire brushed what I could and rust converted. Then painted in rust kill primer. the spoiler also got repainted and plugs replaced on the ends. The under side of the bonnet is going to be black also, currently white. But red on the top side, same colour code as the silo to begin.
×
×
  • Create New...