Destroyed Engine

[brassil]

hey all. just want any advice on what im about to do r32 gtst rb20 timing belt snaped and broke 2 pistons bent 19 valves and snapped 5 valves with guide damage aswell. everyone would say new engine but im not keen on that because the head just cost me 5g worth of porting and custom parts and had alot more work just done car hadent even done 100km before the brand new belt snapped which killed everything head is fixxable and i dont want to waste that money so now thinking bottom end rebuild and stroke to 2.4l which will bring my boost on early since i have a gt3540which on the dyno about half an hour before it snapped made 280rwkw on 18psi. i want to bring it on earltier then 5grand revs and boost it up to about 22 and hope make between 330 and 350 kw

Edited June 5, 2008 by brassil

[gt-ahhh!]

why not get a rb25det bottom end? i have one sitting here, admittedly with two slightly damaged pistons. $100? lol

[sh@un]

you spent $5K on an RB20 head?

ouch

[brassil]

an rb25 doesnt fit the rb20 head very well to much work to get it plus i pull out then straight back in no moods to anything

[brassil]

5k i know but that is with cams and that but it did what i wanted to do i just wanted to work the standard engine.

[murrayis]

theres alot more coin in a rb24 build than buying another rb20 trust me

In the middle of a rb24 build myself

[brassil]

have u come across many problems with the build. the main reson is im lagging to much to make the power i want so i need to bring it on earlier which i stroker would work perfect and make even more power

[brassil]

how much work did the block need to fit the crank and pistons

[brassil]

this is the damege brotel. see the valve indented in the piston

[nizmonut]

boat anchor, go buy, another one.

[brassil]

hopefully block is still good

[Adriano]

An rb20 block is worth about $5, i would just fit an rb25. Your cams will fit straight in. The cost to repair the head would be more than the cost of porting another. What are the $5k of mods?

[brassil]

the head work was port and polished with oversized valves custom springs and custom cams. the porting was huge about asbig as we could go safely.

and obviously new lifters stem seals and valve guides to suite.

[Adriano]

the head work was port and polished with oversized valves custom springs and custom cams. the porting was huge about asbig as we could go safely.

and obviously new lifters stem seals and valve guides to suite.

Unfortunately you can now throw most of that out, if the cams and springs are any good, they will fit srtaight into a 25 head, just disable the vct. A top notch port job shount be more than 1k

[Adriano]

Have you figured out what caused the problem? Could be the cams?

[BoostdR]

I know of a fully built RB20. pm me if you are interested. The engine has low km and can be tested in any way

CP forged pistons, ported heat, etc

[brassil]

at the moment im still waiting from a engineer report it was a defect in the belt from manu facture so they will only pay to have that engine fixed which i will pay the differance for the stroker put in. the head is already getting fixed just got to sort out the warranty for the block but they r goin to fight it and i dont know who to speak to about it.

[R31Nismoid]

Yeah most of the money is wasted when most of the head was trashed nicely.

Not exactly something i would have done... spending 5k on a RB20 head virtually gets you 3/4 the way to a fully built RB26

[STR8E180]

u would be mad to spend that amount of money on a Rb20 cylinder head

better of starting over again on a RB25 or RB26 if u have the money

its a better base to start ur build from

[RaZ_TuRbO]

A fully bombed rb20 head i would think would not even flow close to a stock as a rock 25 head...