Jump to content
SAU Community

Recommended Posts

did you fit a crank collar to your rb30 bottom end, iirc the rb30 has the same short snout issues with the oil pump drive as the early rb26...

might have caused pump failure.

I am pretty sure my oil pump has been screwed for the last 6 months causing me these issues. Getting a GTR pump and hopefully installing it this weekend.

we get the same lifter noise occassionally when the revs drop right down to a crazy low rpm, like 600 or less. But it clears when oil pressure returns to normal. So a lack of pressure will cause the lifters to tick abit. There might have been no problem with them originally, as in not bad enough to replace but its infact your oil pump that needs seeing to.

Yes i think its pretty much a deadset certainty that you need the collar to avoid the oil pump cracking issue.

Edited by r33_racer

pulled down the engine and found that every piston had all the rings broken and in pieces except for one piston. Most of the bearings were scored and number 6 had spun and welded itself to the rod.

So its rebuild time. not going to bother with stock bottom ends anymore. waste of time

Guilt Toy..

Any idea why the bottom end had such a catastrophic failure?

There must be a reason, not just because it was a stock bottom end.

If number 6 had spun... Usually that's a sign of rod bolt stretch from my understanding?

What rings are you going to look at this time around? King have a good rep with the rb30's. However its a must they run the HP bimetal bearings as trimetals are crap in a performance application.

Apparently my style of driving is enough to kill any engine. I like to hit the rev limiter and i like to hit it hard. I like to boost the engine hard on weekends.

Its got 350rwhp... so the stock bottom end was no up to the task ?? I am being forced to upgrade to forgies so this does not happen in the future but i dont know why i need forgies... stock should be enough but in this case it could not handle my style of driving

forgot to mention that i do 140ks a day in the car to drive to work and back and I aint shy on kickin people's ass

The car went hard even though it had the noise.. what cracks me up is that it went that good with a totally screwed engine.. so thumbs up all round - guess i gotta look on the bright side of the situation and build a tough engine this time.

Guilt Toy..

Any idea why the bottom end had such a catastrophic failure?

There must be a reason, not just because it was a stock bottom end.

If number 6 had spun... Usually that's a sign of rod bolt stretch from my understanding?

Edited by Guilt-Toy

A lot of the rb30 blokes are running precision hypereutectic pistons with either nissan or king bearings, some run acl.

Apparently the acll hypereutectic pistons are shiet. :laugh:

There's a bloke here on sau s3girl, he's been pushing 373rwkw through his rb30 running std bearings, bolts and hypereutectic pistons with a GT40 bolted on the side for quite some time, I believe rev cut is around 7k.

make one yourself!

where can i buy a 1 mm restricter? why don't all the big brands sell restricters that size. how much bigger should i drill out the oil drainn holes in the block and head?

Sorry for the bad news Guilt Toy :laugh: . Keep in mind that a failed oil pump will kill any engine even if it has forgies and good rods/bearings etc. My 25/30 vct engine has no restrictors but one oil feed blocked off. It had a set of new(apprently) lifters put in during the build but it tics quite loudly on one cyclinder ( I think only one) for a few seconds after start up..... I suppose I will have to try changing the lifters first but its super pricey for new ones and using s/h ones could be dodgy and doubling the job if they are stuffed too! In the past for me , s/h lifters have manage to suck in gunk when transferred from one head to another. As they fully extend with no load when you take them out, mine seem to have become clogged and you can't clean them!!

Good luck! :)

i agree, and i dont think an oil pressure problem caused piston ring failure either, sounds like severe detonation.

If your spinning bearings, I don't think you need forged rods and pistons.

I did not give this engine a easy time. Its time to upgrade.. New engine specs will be

Aries Forgies

Spool Rods

Crank collar fitter to stock RB26 pump

fully balanced bottom end

Possible valve spring upgrade (does anyone know how much the stock rb25det head valve springs can handle before they start floating?)

Might push the power to 450rwhp then and more for dyno sheetoff's

I did not give this engine a easy time. Its time to upgrade.. New engine specs will be

Aries Forgies

Spool Rods

Crank collar fitter to stock RB26 pump

fully balanced bottom end

Possible valve spring upgrade (does anyone know how much the stock rb25det head valve springs can handle before they start floating?)

For the price of the spool rods its pretty hard to say no. :D

I was talking to one bloke a little while back via PM that began experiencing float at 20psi through is r33 rb25det head. I believe he may of went with a set of springs from PerformanceSprings. ~$285 for a set.

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



  • Similar Content

  • Latest Posts

    • I have no hard data to report, but I have to say, having driven it to work and back all week, mostly on wet roads (and therefore mostly not able to contemplate anything too outrageous anywhere)..... it is real good. I turned the boost controller on, with duty cycle set to 10% (which may not be enough to actually increase the boost), and the start boost set to 15 psi. That should keep the gate unpressurised until at least 15 psi. And rolling at 80 in 5th, which is <2k rpm, going to WOT sees the MAP go +ve even before it crosses 2k and it has >5 psi by the time it hits 90 km/h. That's still <<2.5k rpm, so I think it's actually doing really well. Because of all the not-quite-ideal things that have been in place since the turbo first went on, it felt laggy. It's actually not. The response appears to be as good as you could hope for with a highflow.
    • Or just put in a 1JZ, and sell me the NEO head 😎
    • Oh, it's been done. You just run a wire out there and back. But they have been known to do coolant temp sensors, MAP sensors, etc. They're not silly (at Regency Park) and know what's what with all the different cars.
    • Please ignore I found the right way of installing it thanks
    • There are advantages, and disadvantages to remapping the factory.   The factory runs billions of different maps, to account for sooooo many variables, especially when you bring in things like constantly variable cams etc. By remapping all those maps appropriately, you can get the car to drive so damn nicely, and very much so like it does from the factory. This means it can utilise a LOT of weird things in the maps, to alter how it drives in situations like cruise on a freeway, and how that will get your fuel economy right down.   I haven't seen an aftermarket ECU that truly has THAT MANY adjustable parameters. EG, the VAG ECUs are somewhere around 2,000 different tables for it to work out what to do at any one point in time. So for a vehicle being daily driven etc, I see this as a great advantage, but it does mean spending a bit more time, and with a tuner who really knows that ECU.   On the flip side, an aftermarket ECU, in something like a weekender, or a proper race car, torque based tuning IMO doesn't make that much sense. In those scenarios you're not out there hunting down stuff like "the best way to minimise fuel usage at minor power so that we can go from 8L/100km to 7.3L/100km. You're more worried about it being ready to make as much freaking power as possible when you step back on the loud pedal as you come out of turn 2, not waiting the extra 100ms for all the cams to adjust etc. So in this scenario, realistically you tune the motor to make power, based on the load. People will then play with things like throttle response, and drive by wire mapping to get it more "driveable".   Funnily enough, I was watching something Finnegans Garage, and he has a huge blown Hemi in a 9 second 1955 Chev that is road registered. To make it more driveable on the road recently, they started testing blocking up the intake with kids footballs, to effectively reduce air flow when they're on the road, and make the throttle less touchy and more driveable. Plus some other weird shit the yankee aftermarket ECUs do. Made me think of Kinks R34...
×
×
  • Create New...