Jump to content
SAU Community

**my Rb20det Rebuild Questions Advice Needed**

mattR32gtst

By mattR32gtst,
in Engines & Forced Induction

 Share

Recommended Posts

mattR32gtst Explorer

mattR32gtst

Posted
Posted

Hi everyone ill try and keep this short.

Iv been running my rb20det for 6 months at the final map of 402bhp fly and 375lftb.

On attending a drift day at one of the bigger tracks ready for next years competition season to start i developed a knocking noise, it was then deemed to be bottom end :happy: .

So... i want to rebuild the 20 ( no i dont want to go rb25 before anyone says it will save money )

so as you guys down under seem to be pretty keen on the rb20's what info and sources can you give me on getting uprated parts for decent money as no wear in the uk supplies such things.

Im talking forged pistons & rods etc...

any help and input appreciated

BlueRB240 Collaborator

BlueRB240

Posted
Posted
Hi everyone ill try and keep this short.

Iv been running my rb20det for 6 months at the final map of 402bhp fly and 375lftb.

On attending a drift day at one of the bigger tracks ready for next years competition season to start i developed a knocking noise, it was then deemed to be bottom end :happy: .

So... i want to rebuild the 20 ( no i dont want to go rb25 before anyone says it will save money )

so as you guys down under seem to be pretty keen on the rb20's what info and sources can you give me on getting uprated parts for decent money as no wear in the uk supplies such things.

Im talking forged pistons & rods etc...

any help and input appreciated

Did u spin a rod bearing? You could try and find a good crank and add the oil pump collar and a oil restrictor to the head. Just throw in some new rings and bearings and be on your way. http://www.spoolimports.com/ sells forged rods and pistons for the RB20 if u want to go that route.

mattR32gtst Explorer

mattR32gtst

Posted
  • Author
Posted
Did u spin a rod bearing? You could try and find a good crank and add the oil pump collar and a oil restrictor to the head. Just throw in some new rings and bearings and be on your way. http://www.spoolimports.com/ sells forged rods and pistons for the RB20 if u want to go that route.

I havent taken it all of yet to see axactly what has happened.

sorry if i sound stupid here but whats an oil pump collar and oil restrictor to the head is it something to prevent oil starvation like the 26's suffer from.

Iv been reading lots of other threads about the 2. builds and im definatley thinking of doing the 2.2 which involves parts that are fairly easy to come buy .

boostn32 Mentor

boostn32

Posted
Posted (edited)

ive built a 20 that will be sure to produce the goods. there are so many ways people will tell you to go. i dont use the rods as mentioned above i dont use oil restrictors as that isnt the problem as every one thinks.

Edited by boostn32
AndrewJZX100 Mentor

AndrewJZX100

Posted
Posted

^ pretty sure not, but I'd love to know for sure as well cause my 20 is poo'd out and my mate has a 25de with a snapped cam that I'm currently in the midst of sourcing a head for.

If they fit that'd be great to know.

Roy Grand Master

Roy

Posted
Posted

I have been making about 425hp at the fly for a while now and the internals seem pretty happy. Before buying parts be sure to remove the engine and strip it down and make sure you know the root cause of your problem.

After stripping you may find that your pistons and rods are fine, but your crank badly damaged from a spun bearing. If thats the case then it would confirm what i suspect and thats the internals are ok for that power, but what you have to work on is the control of oil pressure, oil temperature and coolant temperature. You may find you will just as easily spin another bootm end bearing with a fully forged motor if you have not addressed oil presure and tempeature issues and made sure you keep coolant temp under control as well.

So the money you are about to spend on rods and pistons may be better spent on Tomei/Jun/Grex etc oil pump and better oil cooler setup

mattR32gtst Explorer

mattR32gtst

Posted
  • Author
Posted

Cheers Roy some good advice there i must say i was planning on uprating the oil pump and also fitting an oil cooler.

does anyone know of what 4agze pistons i need or where i can get fully forged rb20det ones ???

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

    • QB6SAGR
      Tein Circuit Master- rebuild worth it?

      By QB6SAGR · Posted

      Thanks guys,  Yeah I should at least have them dynoed, at least then I know what I've got as a starting point.  The springs on these are hard as rocks. I vaguely remember Russman saying he was going to sell the shocks to me with the rocks fitted, as he was keeping the softer springs for his new setup.  I didn't click at the time but of course that was to let me know the shock/spring wouldn't be matched.  I also remember pricing up new springs around 2014-15, but, house, money etc. it never happened. So that was another reason to have them rebuilt. I have rebuilt the forks on many motorcycles so I think I could handle the seals on these easily enough, but getting the valving right would be a rabbit hole I cbf exploring.  Duncan, interesting to hear RP was tuning these back then. I might give them a call.  In the mean time I have been busy fitting sway bars. The Whiteline rear sway bar I purchased 15 years ago finally got fitted, along with the Whiteline front bar that showed up last week. Just waiting on new links for the front sway bar to finish that off.  And my spare set of advan AVS VS5's should be back from the powder coaters in a Pearl White finish sometime this week, with a set of Hankook RS4's lined up for fitting.  And then I just have all the suspension bushes to do. A comprehensive kit is on the way... Lots to do before the Ararat hill climb. Cheers guys 🍻   
    • funkymonkey
      Howdy Y'all

      By funkymonkey · Posted

      Nice car! I’m glad folks in the US have gotten past the FnF and are buying real cool cars like the 260RS I was with a bunch of mates in Portland about a year ago and spotted a green Stagea (just a regular 2.5T AWD) parked about 2 blocks away and they were like “a what?” So I made a bet with them for a round of beers and said “ok one of you run down there and tell me if the steering wheel is on the correct side” 5 mins later the American comes trudging back up the hill and goes “he’s right guys. Ok what beer do you want?”
    • Dose Pipe Sutututu
      Starting again

      By Dose Pipe Sutututu · Posted

      Should replace OR drop the tank, give it's good clean. Might be worth replacing that entire fuel level/pump/cradle thing with this: https://frenchysperformancegarage.com/products/fpg-s13-180sx-r32gtst-single-pump-hanger-kit-billet-hat-6-v3-fpg-089?gQT=2  
    • R33_Guy
      Speed Sensor replacement

      By R33_Guy · Posted

      Thank you so much for the help
    • GTSBoy
      Speed Sensor replacement

      By GTSBoy · Posted

      Yes it is ATF. I quote @Duncan "it takes a good synthentic auto trans fluid like Castrol Transmax Z" It's not a diff. It's a transfer case. Totally different thing. Yes, fluid will come out the sender hole. No you do not really need to drain it. Just pull the old, quickly poke the new, clean up and top up. But realistically, you should probably take the opportunity to change it anyway.
×
×
  • Create New...