Jump to content
SAU Community

Rb30 Pressurising Sump...

cactus

By cactus,
in Engines & Forced Induction

 Share

Recommended Posts

cactus Collaborator

cactus

Posted
Posted

Hey guys,

Hoping someone might have some advice.

I have an RB30/25, series 2 block with a series 2 RB25 head (turbo). head is standard with poncams, motor is built with 8.9:1 comp ratio, 20 though bored and thats about it. I havent installed oil restirctors or anything like that. Have good oil pressure, good compression, and motor is strong. One issue I have though, is the motor seems to be pressurising the sump. I can't work out why...

A lot of the time it has blow oil out the side of the sump under full load. Not sure what info anyone needs, but any ideas as to what it could be and how to fix would be greatly appreciated.

Cheers,

Matt.

Link to comment
https://www.sau.com.au/forums/topic/334871-rb30-pressurising-sump/
Share on other sites
cactus Collaborator

cactus

Posted
  • Author
Posted
What do you mean out the side of the sump?

Sorry, wrote that in a rush yesterday... blows the seal between the block and the gasket and starts shooting oil from there.

Bigger breathers on the cam covers, with 18mm lines to a catch can which has a decent filter on top. This reduced the amount of pressure, but still having issues.

cactus Collaborator

cactus

Posted
  • Author
Posted
Do your comp test again and tell us what it gets per cylinder.

Can't possibly have good comp with that much blow by, unless something like the vvt drain has been plumbed into the inlet or something.

Wouldn't have a clue what the clearances are, I didn't build the motor. If it was blow by, wouldn't there be heaps of smoke coming from exhaust as a result of oil burning where it should'nt be? Dipstick is fine, its just the sump-block thats having issues. Motor is in good nick, recently had the head off (while installing cams I made a boo boo), and bores were fine. Pistons do have a lot of play, but apparently they (according to setting provided with pistons, being CP make) require this...

Will do a comp test, but motor is very strong. Doesn't blow much oil at all/doesnt use any oil, until it starts squirting out the side lol.

VVT/head drain T's into turbo oil return.

Duncan Grand Master

Duncan

Posted
Posted

It's RWD right? no 4wd sump adapter?

I can only guess it's not caused by blowby if compression is good and there is plenty of breathing. Possibly only happens when the motor is running because when it stops the oil drains back to the sump below the leak?

Pull the sump off and make sure both surfaces are flat, and well sealed with gasket goop.

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

      I would just put EBC back on the "I would not use their stuff" pile and move on.
    • Duncan
      What brakes on R34 GTT(Europe)

      By Duncan · Posted

      Can I suggest you try EBC directly again and link them to as many competitor catalogues as you can to show their listing is incorrect, eg https://dba.com.au/product/front-4000-series-hd-brake-rotor-dba42304/ If you have access to an R33 GTST VIN and your VIN, you could also use a Nissan Parts lookup like Amayama to show them the part number is different between 33 GTST and 34 GTT which may get their attention
    • Kapr
      What brakes on R34 GTT(Europe)

      By Kapr · Posted

      So i got reply from EBC and they just this site where you can clearly see those 296mm fronts on R34 GTT. I send them photos and "quotes" that 296mm are not for 34 GTT and they are too small. But it will be very hard to return them cuz nobody here knows 100% and they just copy those EBC catalogue :-D https://ebcbrakesdirect.com/automotive/nissan/skyline-r34
    • 04-LOOX
      R34 GTR Vspec Garage Sale - All must go!

      By 04-LOOX · Posted

      Hi, is the HKS  Tower Bar still available ? negotiable ? 🤔
    • Duncan
      Duncan's V37.......race car?

      By Duncan · Posted

      From there, it is really just test and assemble. Plug the adapter cables from the unit into the back of the screen, then the other side to the car harness. Don't forget all the other plugs too! Run the cables behind the unit and screw it back into place (4 screws) and you should now have 3 cables to run from the top screen to the android unit. I ran them along the DS of the other AV units in the gap between their backets and the console, and used some corrugated tubing on the sharp edges of the bracket so the wires were safe. Plug the centre console and lower screen in temporarily and turn the car to ACC, the AV should fire up as normal. Hold the back button for 3 sec and Android should appear on the top screen. You need to set the input to Aux for audio (more on that later). I put the unit under the AC duct in the centre console, with the wifi antenna on top of the AC duct near the shifter, the bluetooth antenna on the AC duct under the centre console The GPS unit on top of the DS to AC duct; they all seem to work OK there are are out of the way. Neat cable routing is a pain. For the drive recorder I mounted it near the rear view mirror and run the cable in the headlining, across the a pillar and then down the inside of the a pillar seal to the DS lower dash. From there it goes across and to one USB input for the unit. The second USB input is attached to the ECUtec OBD dongle and the 3rd goes to the USB bulkhead connected I added in the centre console. This is how the centre console looks "tidied" up Note I didn't install the provided speaker, didn't use the 2.5mm IPod in line or the piggyback loom for the Ipod or change any DIP switches; they seem to only be required if you need to use the Ipod input rather than the AUX input. That's it, install done, I'll follow up with a separate post on how the unit works, but in summary it retains all factory functions and inputs (so I still use my phone to the car for calls), reverse still works like factory etc.
×
×
  • Create New...