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

    • Have a look at that (shitty) pic I posted. You can see AN -4 braided line coming to a -4 to 1/8 BSPT adapter, into a 1/8 BSPT T piece. The Haltech pressure sender is screwed into the long arm of the sender and factory sender (pre your pic) into the T side. You can also see the cable tie holding the whole contraption in place. Is it better than mounting the sender direct to your engine fitting......yes because it removes that vibration as the engine revs out 50 times every lap and that factory sender is pretty big. Is it necessary for you......well I've got no idea, I just don't like something important failing twice so over-engineer it to the moon!
    • Yup. You can get creative and make a sort of "bracket" with cable ties. Put 2 around the sender with a third passing underneath them strapped down against the sender. Then that third one is able to be passed through some hole at right angles to the orientation of the sender. Or some variation on the theme. Yes.... ummm, with caveats? I mean, the sender is BSP and you would likely have AN stuff on the hose, so yes, there would be the adapter you mention. But the block end will either be 1/8 NPT if that thread is still OK in there, or you can drill and tap it out to 1/4 BSP or NPT and use appropriate adapter there. As it stands, your mention of 1/8 BSPT male seems... wrong for the 1/8 NPT female it has to go into. The hose will be better, because even with the bush, the mass of the sender will be "hanging" off a hard threaded connection and will add some stress/strain to that. It might fail in the future. The hose eliminates almost all such risk - but adds in several more threaded connections to leak from! It really should be tapered, but it looks very long in that photo with no taper visible. If you have it in hand you should be able to see if it tapered or not. There technically is no possibility of a mechanical seal with a parallel male in a parallel female, so it is hard to believe that it is parallel male, but weirder things have happened. Maybe it's meant to seat on some surface when screwed in on the original installation? Anyway, at that thread size, parallel in parallel, with tape and goop, will seal just fine.
    • How do you propose I cable tie this: To something securely? Is it really just a case of finding a couple of holes and ziptying it there so it never goes flying or starts dangling around, more or less? Then run a 1/8 BSP Female to [hose adapter of choice?/AN?] and then the opposing fitting at the bush-into-oil-block end? being the hose-into-realistically likely a 1/8 BSPT male) Is this going to provide any real benefit over using a stainless/steel 1/4 to 1/8 BSPT reducing bush? I am making the assumption the OEM sender is BSPT not BSPP/BSP
    • I fashioned a ramp out of a couple of pieces of 140x35 lumber, to get the bumper up slightly, and then one of these is what I use
    • I wouldn't worry about dissimilar metal corrosion, should you just buy/make a steel replacement. There will be thread tape and sealant compound between the metals. The few little spots where they touch each other will be deep inside the joint, unable to get wet. And the alloy block is much much larger than a small steel fitting, so there is plenty of "sacrificial" capacity there. Any bush you put in there will be dissimilar anyway. Either steel or brass. Maybe stainless. All of them are different to the other parts in the chain. But what I said above still applies.
×
×
  • Create New...