Good Components For RB Head

[BoredDSM]

I'm in the middle of planning my build for my rb25 but I do not have a large amount of knowledge in good components for the head. As of right now the plan is to try and make 500whp on pump gas with as much torque as i can squeeze out of a rb25 stroker. I am planning to use the tomei stroker kit for 2.85l i think it is. What head components do u suggest as in valves, springs, and cams etc...? Should I go rb26 head? Who should I go to for porting etc? Also does anyone cryo treat rb heads? thanks for the feed back.

[Makenski]

wow a stroker kit to make 500 hp... wouldn't that be too much?

you can see 500 way easier than what you are suggesting... at most work on internals just for reliability(as in pistons and rods.. stock crank is strong enough). Then to meet your goal.. a nice turbo.. then will have enough dough for other things...

edit: I thought you might catch it, but to mention any ways I didn't note that you will need the other goodies to support the nice turbo, like piping, fueling and electrical.... but you will still have ALOT more dough had you gone stroker...
Modified by Makenski at 10:55 PM 6/24/2008

[BoredDSM]

I like the stroker kit because I would like more bottom end torque. I plan to be doing a very very nice built motor and not skimping on anything so it doesn't really matter how much it will cost me. Maybe I gotta save longer but thats it. Regardless theres 12k into just the suspension already planned. I'm not sure how much I can push out of a stroker but thats what the topic is here for.

[BoostFab]

with much money as you said you will be having, why the hell don't you start out with the rb26 to begin with. you don't need a stinking stroker kit for 500hp

[Makenski]

I'm in the middle of planning my build for my rb25 but I do not have a large amount of knowledge in good components for the head. As of right now the plan is to try and make 500whp on pump gas with as much torque as i can squeeze out of a rb25 stroker. I am planning to use the tomei stroker kit for 2.85l i think it is. What head components do u suggest as in valves, springs, and cams etc...? Should I go rb26 head? Who should I go to for porting etc? Also does anyone cryo treat rb heads? thanks for the feed back.

I still stay with above stated.

you don't need to go far with the head. you don't need to cryo treat the heads, they are made from aluminum unlike iron which does suffer from different cooling rates during processing and internal stresses due to those cooling rares.

You can port the intake and exhaust, giving the exhaust side ONLY a polish. Other than that you can't really rev high due to the head design of the rb25, so just leave the springs and valves alone. They will do what they need to do to take you to 500 hp.

What exactly are you doing to spend 12k on suspension alone? what is the purpose of this project?

[Joe]

I like the stroker kit because I would like more bottom end torque. I plan to be doing a very very nice built motor and not skimping on anything so it doesn't really matter how much it will cost me. Maybe I gotta save longer but thats it. Regardless theres 12k into just the suspension already planned. I'm not sure how much I can push out of a stroker but thats what the topic is here for.

what the hell are you going to buy for your suspension that will cost you 12k?

[BoredDSM]

rb26 is a bit more work than I'm looking for to get into an s13 and also the price of it greatly differ. I like the stroker because it gives more torque instead of hp. Suspension wise I just planned on coil overs, big brake kits, lightened wheels, suspension arm kit, and its actually not 12k. It's 12k if I include the s13.5 conversion kit and most likely paint. Thanks for the explanation on cryo treating the motors didn't know that. Was wondering what else do I need such as cams etc. What should I replace?

[Darius]

If you are going to rebuild the motor with forged internals:

1) You do not need a stroker kit to get 500hp.2) You do not need head work to get 500 hp.3) For the money you would spend on getting an RB25 to 500hp, you could have purchased a stock RB26 and gotten it to 500hp for about the same price, have a better platform for future upgrades, AND get a bigger factor from the ricers.

If you really want to spend as much on the stroker kit as it cost you for the motor in the first place, feel free. But there are other better and less expensive ways to get to the 500hp you want.

As far as your valve train question goes, get a NEO head or replace the S1/S2 components with Tomei parts.

[BoredDSM]

Just curious but do you guys realize that a stroker kit is for torque? Because of the larger displacement I can achieve a better torque to horsepower ratio which is what I'm looking to do. Later on down the road I will turn it into a full drag car. An rb26 is 3k while a rb25 is 2k. Rb25 with 1k invested in it will outperform a stock rb26.

[Carl H]

last i checked the tomei stroker kit was almost 5k...just get a 25 block and 26 crank and overbore...that will get you to about 2.7l...course you want a stroker kit.

[gawdzilla]

thr RB is a high revving motor, not some torque monster even if you stroke it to 2.8. if you really wanted to go budget, start with the rb30 block. still, it is a 3L motor and even then it makes up for lack of tq in horsepower and revs.

try looking into v8s

[Sil240]

If you really want the most torque and your gonna go for a drag car later.Get a RB30 block and slap a head on it.Or checkout Brian Crower, I think they have a 2.95 stroker kit.

As far as the RB25 + 1K > RB26 stock.I'm not sure if I can cosign that statement.

But if $ is not an object, switch to a Neo head and Tomei that ***** out.From Cams to valves and everything in between.

Also for your intake manifold longer runners and larger plenum size will help. It wont be as good up top though.

If you only want 500hp get a RPM dependent boost controller or EMS. You can jack up the boost in the lower RPMS then progresively lower the boost as the rpms get higher and still stay at or under 500hp. Depending on your build.

[Darius]

Just curious but do you guys realize that a stroker kit is for torque? Because of the larger displacement I can achieve a better torque to horsepower ratio which is what I'm looking to do. Later on down the road I will turn it into a full drag car. An rb26 is 3k while a rb25 is 2k. Rb25 with 1k invested in it will outperform a stock rb26.

Just curious but do you realize that a built RB25 with only 450hp will lose traction in 3rd gear on 265 Kumho MXs? Is that enough torque for you?

You apparently don't understand that the internals of the RB25 can't even hold a light to those of the RB26. RB25+$3000 build is still <RB26

If you are set on going with a designer motor, why don't you buy one off the shelf directly from Tomei?? It would at least save you the headache of having to build it yourself.

It is pretty obvious that several people have given their input on how to achieve 500hp on an RB and they are all different and less expensive than what you are proposing. We're only trying to help give you less pricey options and better solutions to achieving your goal.

[BoostFab]

rb26 is a bit more work than I'm looking for to get into an s13 and also the price of it greatly differ. I like the stroker because it gives more torque instead of hp. Suspension wise I just planned on coil overs, big brake kits, lightened wheels, suspension arm kit, and its actually not 12k. It's 12k if I include the s13.5 conversion kit and most likely paint. Thanks for the explanation on cryo treating the motors didn't know that. Was wondering what else do I need such as cams etc. What should I replace?

the rb26 take the same amount of work as the rb25 would. with your big budget stupid for not go straight to the 26 or the 2jz to begin with.. your views on the 25 vs 26 is a bit off.

why the hell spend all that money on looks first ? hmmmm...

uuuh. cryo-treatment, the crank already have it. are you planning to dip the whole motor in cryo ?

[RCA]

For starters:A)Having an S13 with a stock RB25 or 26 is going to be a monster in itself. Swap it first then see if you want any more power

B)If you want a engine that makes the most torque with out tipping the 500whp mark then RB motors aren't where you should be looking. Start looking into diesels. 350whp, 1000ft-lbs FTW

C)Your plans are tottal overkill with the amount of power you are looking for.If you want to run pump gas and want 500whp...

-Stock rb25 block will be ok

-Slightly build your head so this way you can squeeze more power out of stock boost also more revs.

-After market:Turbo systemFuel systemIgnition systemTune dat ish.Stonger Drivetrain (axles, diffrencial ect)Fat wheels and rubber

Your looking at an easy $12k just in upgrades never mind putting the RB in your S13.

Start saving and make a wicked build thread! Happy spending

[Fearsome_tea]

As far as the RB25 + 1K > RB26 stock.I'm not sure if I can cosign that statement.

I agree. I would saythe 25 block is stronger than the stock 26 block. I got that from comparing the two side by side. And we made some pretty good numbers(500 to 600rwhp) on the rb25 for years without breaking them.

[gawdzilla]

I agree. I would saythe 25 block is stronger than the stock 26 block. I got that from comparing the two side by side. And we made some pretty good numbers(500 to 600rwhp) on the rb25 for years without breaking them.

they are basically the same block. a built bottom end will pretty much turn out identical minus the head. your testing is done on the 25 and visual comparisons? the block isnt what fails anyway. difference is the stock 26 head is superior, and the 25 supposedly has weaker rods/pistons but everyone changes those.

name a "weakness" that the 26 block has that the 25 does not share....

[BoostFab]

they are basically the same block. a built bottom end will pretty much turn out identical minus the head. your testing is done on the 25 and visual comparisons? the block isnt what fails anyway. difference is the stock 26 head is superior, and the 25 supposedly has weaker rods/pistons but everyone changes those.

name a "weakness" that the 26 block has that the 25 does not share....

very true. the bare block itself are pretty much the same, just the components.

[neonbomb]

What the **** is this, a honda forum.

i want a skyline gtr like from that one video game!

[Fearsome_tea]

Your right the head is really what sets the two apart. The 26 being solid and a better design as compared to the rb25 Hyd. And yes, it was a visual comparisons. The 25 block had 2 more "ribs" or "webbing" that the 26 did not have. And of coarse the 26 is know for it's crank collar. As so far the 25 having weaker internals.......maybe that is still a matter of opinion.

[Makenski]

Your right the head is really what sets the two apart. The 26 being solid and a better design as compared to the rb25 Hyd. And yes, it was a visual comparisons. The 25 block had 2 more "ribs" or "webbing" that the 26 did not have. And of coarse the 26 is know for it's crank collar. As so far the 25 having weaker internals.......maybe that is still a matter of opinion.

crank collar is not an issue until you get into the higher rpms, where the crank begins flexing... simple solution if you are 300 to 500 hp goals... don't mess near redline for too long and you won't mess up your engine.

[brizanden]

ok im just gonna come right out and say it... i dont think the op has any idea of what he is talking about. also i think this is a dream build destined never to be realized

[gawdzilla]

crank collar issue exists for 25 motors too btw. its very hard to tell from visual inspection what is good and whats not. if you put an RB motor and a 2jz side by side cracked open, most people would think the RB is stronger. the 2jz looks like it isnt up to the task with 2 bolt main caps, no girdle. but i think its generally known which motor is stronger from the factory.

and yes, OP is probably just dreaming
Modified by gawdzilla at 11:29 PM 6/25/2008

[uber95]

Hi just here to say hello as i just joined the forums. I'm very interested in nissans more specifically the 240sx. I am 16 but previously worked on Dsms but it blew the motor a few years back so i figured since I get my license soon might as well get a 240sx and swap it for an sr20. Anyways anyone know any info on a 2000 transam ws 6? My friend some how just pushed the caliper piston out of the caliper and hes not sure what to do and im not sure what to do, any advice?

The above is the reason for the inability to see reason or listen to it. Just give up on trying to explain it to him......

[Darius]

[Coolwhip]

[jt15833]

i vote ls1.has over 300 ft-lb's stock @ 2000rpmOH EM GEEEEEEZ

[lucky7]

this car is gonna screw me up for life. haha. i couldnt go back to 300hp. that would be miserable. haha. this thread already has me thinking about rods/pistons/cams + ported head so i can go for 600hp. lol. i need a few days away from that car. it just makes me want to go fast.

[Sil240]

Hey,

Look in the For sale : Engine section.One of the guys has 5 RB30 blocks for sale.$1500 and there supposed to land in NC in like 4 days.Skip your Tomei Stroker kit or whatever else.Hop on that if you want.

If you want a diesel, theres a rD30et also.

[Coolwhip]

We have a RB30 if you like, here in stock for sale.

and Lucky, it only gets worst, hahahaha