Jump to content
SAU Community

Comman Problems With Rb25det

old mate

By old mate,
in Engines & Forced Induction

 Share

Recommended Posts

old mate Collaborator

old mate

Posted
Posted

i did a search and went back to about mid 07 and thought no point going further back due to development. or i typed the wrong shit in.

any ways i have an rb25det s1 pulled down and it will be rebuilt with pistons and rods, bearings, studs, gaskets of major brands. the motor will see drift work plus track/grip. is there anything i should spend my money on to avoid say oil problems or somthing simialr which is easy to fix but can cause big problems if i dont.

any help you can give would be great.

cheers, steve.

Link to comment
https://www.sau.com.au/forums/topic/249968-comman-problems-with-rb25det/
Share on other sites
The Mafia Grand Master

The Mafia

Posted
Posted

there is a massive thread based on the oiling problems that plague the RB25.

I'd find it and do everything that it suggests, because most of the problems arise when doing track work, in high revs.

The Mafia Grand Master

The Mafia

Posted
Posted (edited)
Dry sump will fix everything :P

But upgrade the oil pump

Good catch can and breather setup

Maybe head to sump oil drain

500mls extra oil.

dude, putting a bigger oil pump on, and not doing the rear head drain, or blocking the rear oil feed in the head makes the problem worse.

The whole problem is oil pooling in the head do to bad drainage at high RPM. If you put a bigger oil pump on, it will simply pump more up there and into the catch can, creating a disaster. I've seen this happen - GTR oil pump on a RB25 with no extra drains... or the rear feed blocked. Blew most of the oil into the catch can.. and then when the sump was starved... bang.

You're giving bad advice I'm afraid...

Edited by The Mafia
MBS206 Grand Master

MBS206

Posted
Posted
dude, putting a bigger oil pump on, and not doing the rear head drain, or blocking the rear oil feed in the head makes the problem worse.

The whole problem is oil pooling in the head do to bad drainage at high RPM. If you put a bigger oil pump on, it will simply pump more up there and into the catch can, creating a disaster. I've seen this happen - GTR oil pump on a RB25 with no extra drains... or the rear feed blocked. Blew most of the oil into the catch can.. and then when the sump was starved... bang.

You're giving bad advice I'm afraid...

The advice I've been given by most engine builders is not to restrict the oil getting up top. It's all in freeing up getting it back down to the sump.

IE, you REALLY want a good drain setup to get it out of the head. Then, you're all sweet.

The issue is only at high RPM, so who knows what it's doing when you're blocking an oil feed off and sticking to low RPMs. You might be starving the head of oil slightly.

MBS206 Grand Master

MBS206

Posted
Posted
I did see a drain set-up for RB30 heads on ebay, was simply a fitting tapped into the rear of the head for extra drainage. Would thios also work on an RB25?

I'm just using the fitting that TUF_RX3 from here made, which is press fitting into the back of the head.

Others drill and tap a fitting in.

The Mafia Grand Master

The Mafia

Posted
Posted
The advice I've been given by most engine builders is not to restrict the oil getting up top. It's all in freeing up getting it back down to the sump.

IE, you REALLY want a good drain setup to get it out of the head. Then, you're all sweet.

The issue is only at high RPM, so who knows what it's doing when you're blocking an oil feed off and sticking to low RPMs. You might be starving the head of oil slightly.

Well, the GTR have a blocked feed from the factory, and a restricted feed up the front. So less again.

I'm pretty sure SK has said that even with a blocked feed at the back, there is still more than enough oil for the hydraulic lifters in the RB25.

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

    • GTSBoy
      What brakes on R34 GTT(Europe)

      By GTSBoy · Posted

      The 296mm rotors are the R33 turbo brakes. The 310mm rotors are the R34 turbo brakes. The calipers are nearly the same, but not. They're the same caliper but the R34 caliper has longer legs so that it sits out far enough to go over the rotor. The pads are the same for both. When you say, "I bough tsome EBC"....did you just mean pads? Or rotors? 310mm rotors fit under 17" wheels. There may be some wheels without enough clearance though. I can't fit my fingers between the barrel of my wheel and the "corners" of my R34 calipers, but there is plenty of room behind the spokes. This is on Enkei RPF1. You can fit 324mm rotors inside a 17" wheel, but I'd be willing to bet that it would be close to impossible with the Nissan/Sumitomo caliper (using an adapter, of course), because the Sumitomo caliper is fatter than the Brembo caliper that is supposed to go on the 324mm rotors.
    • Kapr
      What brakes on R34 GTT(Europe)

      By Kapr · Posted

      Hi. Can someone tell me what brakes(and mainly WHERE) can i buy brakes on R34 GTT? I bought some EBC which SHOULD go on my car(i have GT but it has GTT brakes) but it does not fit, Brakes are "too" small(296mm) Are 310mm be good or? I have 17 inch wheel so no "big boys" but for me driving i just need one that fits and i can get here in EU/Czech.
    • Marek
      Hi everyone.

      By Marek · Posted

      Since winter isn't that harsh anymore in Poland, i will definetely drive it 365 days a year 😉. But if the snow hits i will try it for sure and let U know. Only swap i am planning to do is of course R34 GTR front 😍.
    • Marek
      WGNC34 - floor mats

      By Marek · Posted

      Hey. Very valuable information about pitwork, I will pay attention when buying any consumable parts 🙏 As for the carpets - I got a handful of information from nengun, from which it appears that indeed the carpets for the driver's side are OEM. They are not able to show me any pictures due to the long chain of different sales entities but after I place the order, as soon as the goods arrive at the nengun warehouse from which they will send the shipment to me they can send me photos and if my purchase differs from OEM I can immediately return it / cancel the purchase. I think I will give it a try 😉. Of course i'll let you know what's what as soon as i get them P.s. I know the topic is not relevant to the thread, but both nengun and amayama have these SICK 😍 trunk room lamps available. Do you know anyone who ordered them? I need to have one in my car
    • ARB26
      S1 Autech 260RS Wiring Diagrams

      By ARB26 · Posted

      I've managed to find this: Nissan_Stagea_AutechVersion260RS (1).pdf
×
×
  • Create New...