Rb25 Neo Basic Rebuild For 350rwkw

[Abo Bob]

Agreed

" Any pistons for RB25 will fit the NEO" yes but they will give a much different C.R. to a non NEO rb25

I wouldn't say much different but yes different. I was waiting for him to discover CR for himself. Also your machinist/builder can make whatever CR you want really.

I'll take photos of the rods next time.

33 Piston has a much higher dome than NEOs' I have a set of Venolias setup for a NEO if anyone wants them,New.

Cheers.

So I guess the chambers on the NEO are smaller then? I had a little taken out and with 87 mm bores and the wiseco's I ended up with about 8.75:1 CR.

[BaysideBlue]

thanks guys many valuable info here for the neo.

I have come up with a "mild" rebuild plan,

machining the block

wiseco pistons

shotpeened and polished factory rods

reground crank

upgrade oil and water pumps

Upstairs,

port and polish cylinder head

valve springs and retainers

camshafts

exhaust cam gear (is it necessary?)

let me know what you think.

cheers

[R31Nismoid]

I would use a GTR crank personally for 350rwkw

[BaysideBlue]

So I guess the chambers on the NEO are smaller then? I had a little taken out and with 87 mm bores and the wiseco's I ended up with about 8.75:1 CR.

Is 8.75:1 CR safe enough for high boost, say 1.5bar? if thats the case theres no need to use thicker head gaskets.

Edited July 10, 2007 by BaysideBlue

[skybarge]

I would say do what VB says above, go for the RB30 block, it's going into a GTT right?

use a RB30 block, give it a general freshen up: hone the cylinders if needed, get the crank reground if needed and renitrided, put in new ACL race bearings, a DOHC oilpump, maybe a baffled sump(not really needed though), then upgrade your valve springs, get the cams you wanted and get the d-jetro kit for the PFC or the Q45 AFM and get the plenum you wanted

or just leave it as is, if you are getting a GTR no point spending money, which you won't get back if you decide to sell and upgrade later on

[BaysideBlue]

the gtr I want is still a few years away (not an usual run of the mill $60k r34 gtr) so cant afford it right now. just want to play with my gtt for the meanwhile.

we've decided not to go down the rb30 route because 1st want to test good the rb25 neo really is (not many have been heavly modified)

2nd, might want to keep the stock plenum and many other ancillaries so to see how much gain just from running higher boost. after all im only chasing 350kw.

btw how many rwkw can a z32 afm efficiently deliver?

Edited July 10, 2007 by BaysideBlue