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Who's blown their RB engine and why?

Freebaggin

By Freebaggin,
in General Automotive Discussion

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Freebaggin Proficient

Freebaggin

Posted
Posted

Hi all,

Just wondering how many of you out there has ever had an engine go on you, you know, big stuff like cracked pistons, ring lands, rod failures, valve gear problems, head gaskets, etc etc.

If you can state generally what level of tune you had (rwkW) and why you think it happened, it would interesting to know.

Looking forward to the horror stories!

Freebaggin.

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Munro Experienced

Munro

Posted
Posted

At the 4 6 & rotary nationals in Feb this year, I blew up

my RB26 engine in the R33 GTR.It had around 340 rwkw using

bolt ons like HKS 2540s,FMIC,etc, but the engine itself was

untouched. I did 2 back to back runs, which was silly cause it was

too hot & the oil system must not have been able to keep up.

It ran 11.5 & 11.6 and on the second run developed a loud rattle.

When we pulled the engine down, the no. 4 conrod bearing was

completely missing except for a wafer thin bit left welded to the

crank!It was amazing the whole lot didn't let go through the traps.Also the crank was bent 2 thou & one of the pistons had been bouncing off the head.Keir wilson(R32 GTR 10.5fame) bought

this engine, rebuilt it and ran 10.6 at drag combat with it!!

So, providing they dont throw the rods out of the block, they can

be rebuilt quite easily.On the same day in Feb, Keir was not so lucky with his R32.Oil starvation through the traps welded the crank to the block & KABLOOEEE.

I remember grabing Brenton's Adelaide Clutch ute & hooking down to help him.One of the safety guys came over & passed me a handful of bits off the track.One of the bits was a bit of the block

with san (part of the nissan) on it! What a mess.Other than the Head the whole thing was scrap metal.

Now we both have OS 3 litre engines with larger,baffled sumps.

Hope it dosen't happen again, but when you rev over 9000 rpm

nothing lasts forever.

:flamed:

Pva_Glue Grand Master

Pva_Glue

Posted
Posted
Originally posted by adam 32

blew up my internally std RB20

too much boost from the T04 and not enough fuel!!

made around the 280rwhp mark i think before it blew

hehehe I told you dont tinkering with boost! :P:cool:

hehehehe... how is your car running now? all fixed I hope:)

cheers

Joe

Guest nismogtsx

Guest nismogtsx

Posted
Posted

I did a couple of valves in cyl no. 2 when the conrod snaped and left the piston at the top... LOL The next rotation the valves opened and they hit the fused piston.... The mechanic who rebuilt had to drill the piston out of the cylinder it was that well fused....

My main point is that with mods the cars run well, but i was doing 230rwkw all the time and the conrods were standard... Now their a Nismo part... Got them fairly cheap....

Guest nismogtsx

Guest nismogtsx

Posted
Posted

I totally forgot my point.

Anyway i did all the bottom end but didnt wait for the rods to come. I got too hasty and re built my motor with the original 100,000km conrods and they lasted 3 months... So thats not bad... But you need to have a weak point in every motor.... Because there's no such thing as bullet proof.....

NOTE: Build it stong and give it heaps when you wear it in so the parts bed in hard and are ready for a hard life....

  • 1 month later...
Dr_Drift Veteran

Dr_Drift

Posted
Posted

Engine 1: 145 RWKW T3/4 High Flow Trust FMIC..... Standard Fuel Pump....ang bang rattle rattle.... too lean....

Engine 2: Sheared the cam belt tensioner bolt and lunched the head.... I've been told someone may have replaced the cam belt idler bearing and overtightened the bolt??

Engine 3: Still running hard with 180 RWKW... new owner hasn't blown it (yet)

blind_elk Grand Master

blind_elk

Posted
Posted

BIG chunk of #1 piston - down to the ring land - parted company with the rest of the piston, and played pinball inside the combustion chamber. Also broke the top ring and bent an end of it upwards. Amazingly, not outwards, because bore is totally unmarked.

I suspect a dyno run had it lean out and detonate at the top end (fuel pump incapacity), but no proof.

Had a mild build - T3/T4 hybrid, FMIC, only about 115 awkW.

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