stroking 25 to 26 specs...questions??

[bumblebtuna]

alright, i took my NEO RB25 crank to get the collar fixed.to make a long story short, the guy bowed my crank snout by heating it up too much, rendering it useless.

So, i found a guy selling an rb26 crank (good oil pump drive!) and rods for $600, aside from the crank and rods, what else is needed? (obviously pistons, keep reading)

i'm not sure if anyone's followed my build, but i sent my pistons off to CP yesterday (before the crank mu****ulation) to get a set custom made for my setup at 9.5:1 compression. i'm 99% sure the bore is the same. what is the difference in the actual pistons of the RB25/26? as i will tell them to just used 26 specs in place of the 25 i sent them. to create my stock bore and 9.5:1 ratio

i searched a little, anyone ever done this and wanna throw out some suggestions.

thx in advance

[Darius]

Search for my build thread or an RB25 RB26 pistons thread in the archives. I posted pics up of the differences with measurements and other variations. Basically since the RB25/26 rods are identical in measurement and the blocks dimensions are identical, the difference in stroke of (1.2mm or whatever) must be compensated by moving the wrist pin up into the piston 1.2mm or whatever that difference in stroke is. I'm too lazy to look it up right now.

I'm sure CP has RB26 pistons already but they're not 9.5:1.

[bumblebtuna]

thx darius

cool, so in essence i have an rb26 short block?all i need is rb26 pistons, crank, rods, rb26 bearings, main studs/rod bolts and i'm good to go?!

does anyone have a clue if the stock ECU will compensate for the .1 liter difference... honestly by the time it's put together and in the car i should have enough for a Power FC but was just curious.
Modified by bumblebtuna at 12:10 PM 10/24/2007

[Adrian gt]

thx darius

cool, so in essence i have an rb26 short block?all i need is rb26 pistons, crank, rods, rb26 bearings, main studs/rod bolts and i'm good to go?!

does anyone have a clue if the stock ECU will compensate for the .1 liter difference... honestly by the time it's put together and in the car i should have enough for a Power FC but was just curious.

Modified by bumblebtuna at 12:10 PM 10/24/2007

well you still have hydraulic lifters not solid ones. the .1 displacement should not be an issue for the ECU but the compression will be, you will ne to retard timing, get a proper standalone

[Darius]

You could probably squeak by without a standalone if you were happy with the power level of the stroked motor, but I am assuming and hoping that you're aiming higher and, therefore, agreeing with adrian. Get a standalone.

[bumblebtuna]

well you still have hydraulic lifters not solid ones. the .1 displacement should not be an issue for the ECU but the compression will be, you will ne to retard timing, get a proper standalone

i'm pretty sure NEO's had solid lifters.

You could probably squeak by without a standalone if you were happy with the power level of the stroked motor, but I am assuming and hoping that you're aiming higher and, therefore, agreeing with adrian. Get a standalone.

definately aiming higher...guess i'll shell out for one when i get the block put together.

which Power FC should i get? the ER34 RB25 (NEO) Power FC is discontinued, but still sells over at Skylinesaustrailia for around $1100.

- OR -do i need the RB26 Power FC?

I'm 98% sure the Neo PFC is the one to get, as most of the calibrations are in the head??

[Adrian gt]

i'm pretty sure NEO's had solid lifters.

definately aiming higher...guess i'll shell out for one when i get the block put together.

which Power FC should i get? the ER34 RB25 (NEO) Power FC is discontinued, but still sells over at Skylinesaustrailia for around $1100.

- OR -do i need the RB26 Power FC?

I'm 98% sure the Neo PFC is the one to get, as most of the calibrations are in the head??

i've heard of people wiring the rb26 power fc to the 25. as for lifters i don't know much about the neo to be honest.or if you shell out a few more you could go heltech and have multiple maps

[Darius]

Yes the NEO has solid lifters and solid lifter style cams to match. The lobes are a little more rounded than peaky like they are for the hydraulic lifters. If you get forged internals, then your rpms will not be limited to ~8400 by the hydraulic buckets. You could safely hit 9000 with upgraded valve springs.

If you're going to spend that kind of money, go AEM EMS. Or just keep looking for a deal on aussie web boards.

[StricNyne]

i was told with hydro dont go over 8400 no matter what u do to valve train

[Darius]

That is what i've read as well.

[bumblebtuna]

how much could i get an rb25 (or 26? [which do i need]) AEM ems with the trigger wheel fix for?

i really liked the power fc plug and play.but the AEM unit would great.

[until240]

bumblebtuna,

did you happen to find the rb26 crank and rods on freshalloy?

[digzsublime]

Bet he found them in the RB for sale thread in the sub forum. It's in the stickies above this thread. I was looking at that same post a couple of days ago thinking it would be a cheap stroker set up for my RB20.

I can't believe they aren't already sold. 600 bucks for good 26 crank and rods is a pretty good deal.

[bumblebtuna]

yeah, they were in the classifieds on this forum.

i'm meeting the guy in atlanta this saturday. so yeah. sold to me

i talked with a tech (one of the guys at erics performance) today and he answered almost all of my questions. should be getting rb26 CP pistons along with bearings/studs. can't wait

[until240]

well the reason i asked, and the reason i was a little worried is that i already paid for them over a week ago! he was supposed to email me when he sent it, but he never did...check out this post on freshalloy...same pictures and everything!



http://forums2.f r eshalloy.com/showthread.php?t=175239&highlight=rb26+rods

sorry for the spaces, but it's the only way i could get the url on here without it changing to nicoclub instead of freshalloy.
Modified by until240 at 11:58 PM 10/25/2007

[bumblebtuna]

no, he told me you put a 100 deposit down and couldn't come up with the rest...

he already spoke to me today and made plans to meet me in atlanta so i assume you'll be getting a refund

[until240]

what!!!! that's bs!!!! i know this isn't very substantial, as it is t:he internet, but here's my email conversation with him (just copied and pasted):

edited per boostin's request.

Modified by until240 at 9:41 AM 10/26/2007
Modified by until240 at 11:03 AM 10/27/2007

[boostin1234]

Ok, there is a huge mix up. That is my brother you were talking to, and he had to leave town for a few days and forgot tot ell me he got money for the rods. I am not stealing your money and i promise to get him to refund it ASAP.

I am reeeeeeaaallly sorry for the trouble, i am not a thief and not stealing anyones money. Just a retarded mix up.

[Coolwhip]

ouch, hope this gets resolved.

(haha, was looking at that crank as well)

[boostin1234]

This will definitely get resolved. I don't want to look like some thief or anything.