Jump to content
SAU Community

RB26 vs RB30 crankshafts

khezz

By khezz,
in Engines & Forced Induction

 Share

Recommended Posts

Predator1 Rising Star

Predator1

Posted
Posted
2 minutes ago, BK said:

Yeah I know Nitto "rate" the 3.2 to 10000rpm and they "rate" the 2.8 to 11000rpm. As my 2.8 crank came from them with test results balanced up to a confirmed 10000rpm, I bet the 3.2 is only "tested" before delivery to 9000rpm to be safe, knowing realistically no one is spinning a 3.2 past 9k and a 2.8 past 10k.

Did you pay extra for it? I have a 3.2 but i didnt receive such a report.

BK Grand Master

BK

Posted
Posted

Yeah ? I have purchased 2 Nitto 2.8 stroker kits before and both were included with them from Nitto. 1st crank went to Rick Corbett engineering in Adelaide and 2nd crank went to CRD and whoever they use for machine work to double check Nitto reports. I'll dig up one from Nitto.

GTSBoy Grand Master

GTSBoy

Posted
Posted

There's a big difference between spinning a crank up to high rpm bare (without actual engine loads, ie combustion) and using it at the same rpm making a lot of power. There's a certain sized grain of salt required when looking at a balancing report that says the crank was spun to X rpm. Sure, it was fine under those conditions, but add the reciprocating loads up and down the conrods onto the journals and it is suddenly not the same as spinning it from one end.

  • Like 1
BK Grand Master

BK

Posted
Posted

Absolutely, but what else can you go off ? The fact the pretesting is not done right up to claimed max rpm is more realistic real world documentation. I wonder how Nitto is coming to the conclusion of their max rpm and power limits then ? Probably just estimates / calculated guess ? Anyway its proven to be pretty good gear, and more than adequate for what 99% of people are going to throw at it.

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

    • jtha7
      Replacing turbo water line - any recommendations or advice?

      By jtha7 · Posted

      Hi all, Restoring r33 series 1 rb25det. All the heater hoses were on their way out, have replaced them and put it all back together. After testing I noticed a small leak from behind the head on the actual metal water line to the turbo when cars warm. I tried running a longer hose over it but it kept leaking...   I am about to take the (stock) manifold off again😔 to change the water line does any one have any lines they recommend? I was looking at Aeroflow Turbo Oil & Water Line Set but not sure what everyone else recommends. Car is completely stock but want to upgrade turbo eventually. it looks like ill have to disconnect a lot just to replace these lines so if there's anything else recommended to do please let me know. Thank you in advance!
    • MBS206
      RB20DE NEO smallbox clutch.

      By MBS206 · Posted

      From memory, on the R33 GTSt at least, while everyone says "It's not adjustable", I found when I changed clutches in mine, it just needed a small adjustment on the rod length. But be very wary here, as you could end up trying to push the pushrod in the master too far, or blowing out the slave.   Most likely though, if the master/slave isn't bypassing internally or leaking out, then the throw out is the wrong height compared to the fingers on the clutch, so when it moves to disengage the clutch, it isn't 100% disengaged. You can check part of this out too by jacking the car up, having the engine running, put your foot on the clutch and try to engage 1st gear. If it goes in pretty easy (Compared to the ground) and/or the wheels start turning a fair bit and it takes a bit too much brake pedal to bring them back to a stop, this is likely the issue.  I'm not sure if you can adjust the height of the forks etc in these though, it's been that long since I've touched any RB gearbox.
    • MBS206
      Lock up the old for sale / wtb threads.

      By MBS206 · Posted

      That's all good, I thought I was missing some interesting feature! Maybe @PranK can double check if that is something that is meant to be operating or not.
    • Kapr
      RB20DE NEO smallbox clutch.

      By Kapr · Posted

      I hope that is not something that bad. From what i remember he said that only first gear is "hard" to get in and that he has couple of ideas what to try next but idk 😕  hope it is not gearbox out. I will let you know.
    • GTSBoy
      RB20DE NEO smallbox clutch.

      By GTSBoy · Posted

      If it's not the hydraulics, it is probably gearbox back out. Usually as per @Duncan's post, or otherwise associated with not getting the throwout fork positioned correctly. All the way up to catastrophically bolting shit back together without it being aligned properly and wrecking the clutch/input shaft/flywheel/something else.
×
×
  • Create New...