Jump to content
SAU Community

Rb30-gtr Pistons

R30_elliott

By R30_elliott,
in Engines & Forced Induction

 Share

Recommended Posts

R30_elliott Newbie

R30_elliott

Posted
Posted

Hi guys, long time reader here first time poster

I've got a r32 gts25 sedan that i've sold my 20det setup (284rwhp if anyone cares) to build a RB30det, so far i've got a garret truck turbo, similar size to 3540, rb30e bottom end and r32 25de head, gtr valve springs, oil pump collar, just buying up the bits as i see them basically

I've also aquired a set of 26dett pistons, I've tried searching and haven't found a definite answer to if i can use them or how much work is required? i have a set of 30e pistons to which i'll use if the 26's arent any good, basically what i'm asking is  a) how hard are the 26 pistons to fit, and b) is it worth it?

thanks in advance guys. I'm sure i'll have many more questions as the build progresses

Cheers :P

Link to comment
https://www.sau.com.au/forums/topic/262171-rb30-gtr-pistons/
Share on other sites
R30_elliott Newbie

R30_elliott

Posted
  • Author
Posted
Pretty sure you have to use RB30 pistons as their pin heights etc are to suit RB30 rods & crank..

cheers for the reply, so i cant use 30 rods with 26 pistons? i havent had a chance to measure anything up yet, was trying to avoid wasting my time if people already knew the answers haha

might have to take them into work and whip up some drawings to see if its a suitable option,

bubba Grand Master

bubba

Posted
Posted

Not sure on the exact differences, I'm using RB30 spec forged pistons. You might find that with 26 pistons on 30 rods on a 30 crank that you could be smashing pistons into valves.. need an experienced RB builder to answer that :P

R30_elliott Newbie

R30_elliott

Posted
  • Author
Posted

cheers guys, turns out one of them is poked anyway so ill prob just stick with the 30 pistons, on the subject of 30 pistons, i've got a set that i had ultrasonically cleaned, when they came back they had lots of pitting in the top of the piston, im assuming its just bad casting/ has anyone else had a set that were the same? i tried to take a pic but it wont pick up the detail- aka budget camera

R30_elliott Newbie

R30_elliott

Posted
  • Author
Posted
That pitting is probably from detonation..

I was hoping that wasn't the case but had my suspicions, picking up another motor tomorrow hopefully the pistons in that one are better, first motor had a bent crank (god knows how) so i had to buy a whole new motor to get a new crank, what a mission just to get more power!

R30_elliott Newbie

R30_elliott

Posted
  • Author
Posted
Bent cranks are quite common in i6 engines.. just make sure you get all your clearances checked and machine appropriately.
 

it had about 0.3 bend in it, decided to try another as its cheaper to get a new one than grind, bit of a gamble to but its a low k's engine so should be ok

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
      Possible swap on R34 RB20DE NEO?

      By GTSBoy · Posted

      If the RB29 box in the car is a push clutch, then yes, you will need to deal with the pull clutch on the turbo box. You either buy a pull clutch and don't use the old one, or you do the things needed to convert the turbo box's clutch arrangement over to push. Which is a bit of a f**karound. "Making" a custom tailshaft is the easy part. But you will need to source the front clip yoke - the bit that goes into the output of the gearbox. These are not as easy to find. They are out there, but they don't grow on trees the way that they used to.
    • GTSBoy
      Turn signal wiring question

      By GTSBoy · Posted

      Indicator bulbs are way too bright to use as a "corner marker" (we call them parking lights too). Sure. Go ahead and do it. But realise that you wil need to come up with all your own wiring to do it, as no-one will have a standard howto worked out for Skylines. It's just a matter of abandoning everything that Nissan have done and starting from scratch. You'd probably be better off retrofitting tailght/brakelight globe bases into the front indicator housings and using the taillight circuit for your corner marker and the brake light as the indicator. You'd need to work out how to kill the marker circuit while the indicator is flashing, otherwise it won't flash on-off, just bright-less bright.
    • Kapr
      Possible swap on R34 RB20DE NEO?

      By Kapr · Posted

      Hi. A little bit of an update. It maybe(hope not) looks like i would need a new tranny(it would be "maybe" a cheaper or better option anyway) So i need some info. I know i need a different propshaft(i can make custom one) LSD is not a problem cuz the engine will be still(for now) N/A RB20. So if i buy RB25DET NEO tranny...is there something else i need? I read something about push/pull type but i do not know if i need to "change" something or i can just plug n play onto my engine a go? Thanks for the advice  
    • OakvilleGTR
      Turn signal wiring question

      By OakvilleGTR · Posted

      Good morning all, Bit of a random question but figured I’d finally throw it out after wondering for a long while. Before I start, I'm hoping to do this purely out of personal preference. I think it would look better at night, and don't mind at all spending a few hours and dollars to get it done. I've copied this from a non-Skyline specific forum, so I apologize for the explanation of our headlight switch setup that we all know. Here we go: Zero lights (switch off) Parking lights (switch position 1) being a rectangular marker on the outside of the housing, my low beam being the projector in the centre (position 2), and a high beam triggered by my turn signal stalk. Most North American cars I’ve owned of this era have power to the amber corner (turning indicator) light as part of the first switch (parking lights). I’d love to have these amber corners receive power when the headlights and parking lights are on (headlight switch), yet still blink when using the turn signal which is of course a separate switch. Hopefully I’ve explained my question correctly. Is anyone aware of a way in which I might be able to achieve this? Thanks in advance
    • Kinkstaah
      Mistakes were made, my R34 Story

      By Kinkstaah · Posted

      My heads are cathedral port! It's likely possible, but I don't want to add any extra moving parts (I know they don't move) between the heads, manifolds, etc. It will also affect how injectors/fuel rails etc sit and I don't really know if it would change how the FAST manifold goes/sits/fits. I have the LS6 steam pipes already as I have a very late LS1 block so it should be fine. I couldn't find anyone who had ever actually used one for this purpose, it seems 100% of people grind the water pump. The thermal spacers are 12mm and are half way to the cost of the newer water pump anyhow... so if it comes to that I suppose I'd rather buy a new pump. The bearing in the pump I do have is a little.. clunky, but it hasn't done that much time and I never noticed it when the car was together in the past few years, so..
×
×
  • Create New...