rb26 internals in a 25

[StricNyne]

Ok, i have researched this for a while and found something that contradicts what i have read, i purchased rb26 pistons and rods for my 25 and i acquired a rb6 crank eventually. i was told initially that the 26 rods and pistons will drop in fine, and are stronger than the 25. As of now thats the only thing i am sure of, that the 26 are stronger. Recently i was told pistons would drop in fine, but block would have to be machined if i used 26 rods. Then i was told i would be find to just drop in. Another person told me 26 rods and pistons r no good without crank from a 26. I really could careless about raising my displacement from 2.5 to 2.6 if it happens i will be happy but ohh well my main concern is what steps i need to drop in the slightly stronger internals. i was told to just shotpeen the rods, get new pistons rings and drop them both in and i would have a 2.6 displacement, that was the most recent thing i was told. Withing a few weeks i will be getting new headstuds as well as a metal headgasket and probally would do all at once so i wanna know whats the wisest choice to make.

[BoostFab]

so you have the rb26 crank, rods, and pistons already? that would be fine if you have the rb26 crank in the setup, because the rb26 pistons has different (lower than rb25) compression-height--to compensate for the longer stroke. both rb25 and rb26 con-rods are the same. you may want to double check the piston rings for proper cearance. also make sure that the cylinder-walls on the block are good, otherwise a mild hone is needed.

[StricNyne]

yes i have everything, i kinda wanted to stay 9:1 compression so if i use 26 pistons should i use a hg to raise compresison, i really want to avoid using the rb26 crank cuz i know someone interested in buying it

[CKs240sxNC]

i was going to use 26 pistons in my 25 but piston clearance was higher so i just bought wiseco pistons, look at the service manuel SD-7 for specs

[StricNyne]

I got a lil bit of time before i get studs and hg which is when i wanna drop in the new internals, i dont just want a fast and strong car, i want a reliable one

[BoostFab]

i kinda wanted to stay 9:1 compression so if i use 26 pistons should i use a hg to raise compresison,

why would you want to raise the compression?

[gani]

rb26 pistons work fine in a rb25block thats what i run in my motor.onlything is compression is abit lower then 8.5:1.

[BoostFab]

rb26 pistons work fine in a rb25block thats what i run in my motor.onlything is compression is abit lower then 8.5:1.

how is the responsiveness?

[gani]

fine but im running a t76 so..............

[Sky240PWR]

what's your whp with that setup?

[StricNyne]

i dont wanna raise compression i wanna keep it 9:1, i am gunna be runnin a 62-1

[StricNyne]

also should i just use stock rods and get them shotpeened or shotpeen us the 26 rods ?

[gani]

use the rb26 rods they are stonger.with my setup i did about 450 on mild boost but i tore the motor down again to fit forged internals.im like you do it once and do it right. so well see when i put it back together im planning on running 2bar of boost.

[StricNyne]

aight so the rb26 rods and pistons r just drop in ? if yes i will shot peen the rods

[Imissmyturbo]

RB26 rods are better then RB25's. I think most aftermarket rods are listed for RB25/26. While you are at it you may want to put some ARP studs on the rods.

[DETurbine]

The RB26 internals will fit right in with no problem. I have researched for a while now. The rods will bolt striaght up to the RB26 crank. The RB26, RB25, and SR all have the same conrod bearings, so that shows right there that they will bolt up without a problem. The RB26 rods are the main upgrade. I have a set of both of them hand and hand and the 26's are allot stronger and thicker.

[StricNyne]

ok so the 26 rods will bolt onto the 25 crank and get some sr20 bearings, will it raise my displacement to use 26 rods and pistons on my 25 crank though i just read compression will lower

[gani]

compression will be lower but nothing to worry about as it will not affect response. but do change the rod bolts to arp if you wanna rev the motor high.

[StricNyne]

aight so here is the game plan, Rb26 Pistons, Rb25 crank, Arp rod bolts, and Rb26 Rods. with sr20 bearings.....

[fito]

ok, here I go.

Rb26 and Rb25 rods are the same lenththe difference is in the pin location on the pistons, so Rb26 pistons will sit lower than the 25's. If you use the Rb26 crank, you'll conpensate that difference and bump the compression back up.

If you go rb26 pistons with either rods and rb25 crank, the pistons will not reach the top of the cylinder, lowering your compression. If you whant responce, this is not the way to go. Anyways, make notice that both rb25 and rb26 rods are SUPER strong, I did 587HP@ wheels with stock rb25 pistons and rods, I don't say it's safe but it's possible.

[fito]

My advice would be, mount the rb26 crank, rb26 pistons, and rb26 rods. SR20 bearings will work, they're not exactly the same, but will work. The .1 bump in displacement may sound little but it'll help in the responce.

[StricNyne]

awesome explanitation heh, i might just do rb25 crank with a high compression hg and 26 rods and pistons, just cuz it would be cheaper for me to sell that crank than use it

[BoostFab]

My advice would be, mount the rb26 crank, rb26 pistons, and rb26 rods.

for crise sake, do that combo.

[StricNyne]

ya, im just gunna do it heheh, maybe get block blue printed also local guy does it cheap, im looking at like 3 weeks of downtime but worth it, put head will be ported, new cam gears, maybe cams if i can afford, all rb26 internals with strengthened rods, metal head gasket and arp head studs and rod bolts, should be sturdy eh ?

[gani]

i would suggest that you get the oil pump drive extended coz ive had my motor and turbo let go coz of this. if you can afford an upgraded pump youll be in great shape.

[StricNyne]

hmmm u think n1 pump would work ?

[gani]

well its better than stock and you dont have to fork out 1200 bucks like some of us for a jun oil pump. if you do the oil pump drive extension mod you should be good.

[StricNyne]

hmm awesome, i need to search something for it

[stutterr]

Hey Guys,

I have heard people swapping in the Rb26 Internals into the rb20, build the head (springs, valves) and it makes one beast of a engine.

What would I need and is it feesable?

[Darius]

Look up RB24

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