gearhead55

I recently sold my RB25 s13 and I am missing it. I am thinking about what I would like to build next and I am leaning toward something classic.

I've seen the Rocky Auto cars and such that have carbureted RB25s and 26s, but I can't find any information on them in English. Do they use high comp pistons? What kind of power are they making? Are high comp pistons for an N/A build available in the US? Or cams designed for N/A use? And are there any carb conversion kits available on this side of the pond? I can't find anything through my searches.

Basically I'm just looking for that old school look with velocity stacks and that classic N/A sound but with some useable power. Any information on prices and power numbers would be greatly appreciated.

S12 Drifter

I would like to know this, when I get my hakosuka one day iKd wanna do a rb20ds itb carb and compression of 12.1

Sent from my SPH-M920 using Tapatalk 2

__________________

dawagarage

sounds like a lot of work aka either a lot of money, and/or ingenuity, know how and fab skills.

find out what head they used, thatll be a start.

you MIGHT be able to bolt an old L series head to the RB block, but if that were the case then you might as well just put a L series engine in your car.

as for pistons, etc, im sure youd have no problem finding whatever piston you desire stateside. BOTH piston design and head design will dictate compression. and for that, you might have to do some math if you cant find anything readily available

__________________
formerly known as "hotboiblaze"

ratsun: dawa (73 datsun 620)
clublexus: properD (97 sc300)

S12 Drifter

you can bolt a RB head on a L block but NOTHING lines up.... literally.

__________________

dawagarage

well if he wanted to run carbs it would be easier to bolt the L head to the RB block (not the other way around) but if it doesnt line up the way you said, it wont line up the other way either.

i say just go for running a full L!!! itll be super inexpensive, plentiful parts, all you gotta do is fit it in the pay and get the motor mounts, to work and get it to bolt up to whatever trans

__________________
formerly known as "hotboiblaze"

ratsun: dawa (73 datsun 620)
clublexus: properD (97 sc300)

zerodameaon

I looked into this some few years, it appears most of those carbs are one off setups so its very doubtful you will find any kits.

__________________

Need to adjust your idle?
http://zilvia.net/f/s-chassis/395413...-pictures.html

gearhead55

well if I was going to use an L series head I would just use an L28. I've heard of 3.2l stroker L28s making 300whp. My reason for using the RB25 is the dual cam head. I like the look/history of the S20 motor. From the pictures i've found it looks like the Rocky Auto cars are using regular RB25/26 heads just with custom manifolds.

RB30, looks like RB26 head, Solex(?) carbs:
S30Z RB30 - ‹ŒŽÔE–¼ŽÔ(ƒnƒRƒXƒJEƒPƒ“ƒƒŠEƒtƒFƒAƒŒƒfƒB [ZEGT-R)‚̐ê–å“X ƒƒbƒL[ƒI[ƒg

RB25 head, Solex(?) carbs:
ƒXƒJƒCƒ‰ƒCƒ“ RB25ƒXƒ|ƒCƒ“ - ‹ŒŽÔE–¼ŽÔ(ƒnƒRƒXƒJEƒPƒ“ƒƒŠEƒtƒFƒAƒŒƒfƒB [ZEGT-R)‚̐ê–å“X ƒƒbƒL[ƒI[ƒg

RB25 head, Solex(?) carbs:



hmmm I see.

EvilRB

^ LOL
I was thinking of that samw car when I say this thread

I would actually looking into the the RB30 a little, I think there are kits made for the motor for the older skyline crowds and it just would be bad ass to seee one here
OR maybe it was another one of Rocky Auto's kits...
IDK it's just soemthing I remember reading in a thread long time ago in a forum far, far away...

Way to think different!!!

Ninja Edit: just noticed your local, If you ever get this project off the ground and need help, Let me know I'll come by and lend a hand!

__________________

KiLLeR2001

Looks like gearhead is suffering from post-traumatic two-tone separation anxiety disorder (PTTTSAD), seen this all too often I'm afraid...

__________________

gearhead55

Thanks! it will be months before I even pick up a motor if I decide to go this route, but i'll keep you in mind.

Hahaha yes I am. I'll leave the two tone life to you for now. Your car is too clean haha.


anyway here is this, the motor is shown at 1:50:




and this is the video that makes me want a dual cam motor:


If that head was possible to obtain that is the route I would go, regardless of what power it would make, solely for the rad-factor.

Sileighty_85

yeah that Z is running a RB30 Bottom and 26 head, failrly common in AUS and other High HP builds as the head will bolt to the block you just need to relocate the timing belt pullys

If your really lucky you could get yor hands on the Autech R32 RB26DE which was Naturally aspirated. 10.5:1 compression ratio and produced 217 bhp

__________________
後輪駆動車１番
1989 Built SR GT2871R -363whp
1998 S14 W/RB25- 250ish (For Now)
1986 SR86 - 200ish
1990 R32 GTR - 320hp
Don't Buy Engines from JDM-Online http://zilvia.net/f/businesses/207457-jdm-online.html
Don't Buy XS-Power or SSAC Shit

S12 Drifter

L's make some pretty impressive power N/A if done up right, but are insanely expensive though, but on the plus side parts are extremely plentiful.

__________________

EvilRB

You should just get this and start the project

http://zilvia.net/f/cars-sale/516606...500-takes.html

__________________

fliprayzin240sx

Did you say NA carb'd RB?

http://zilvia.net/f/builds-builds-on...est-build.html

__________________

If you think Zilvia has too many assholes...
CLICK HERE!!!

OrangeVirus1

you can get a RB20DE non T Intake manifold with individual throttles and stacks for about 800$ straight from Japan.

get that along with a RB20, Have some custom 17 or 18:1 compression pistons made and run it on E85 or LPG Propane

( or do the same with any of the RB's )

gearhead55

I found that when searching, but that's not carbureted. Read the thread, it's using RB26 ITBs. ITBs are still EFI.


What RB20 ever came with ITBs? Do you have a link for that? I was thinking more like 12:1 with an RB25 on pump gas. I'm not really looking to run a 2.0l with a compression ratio crazy enough to require more than pump gas.

OrangeVirus1

Nissan Skyline HCR32 RB20 itb Special Order Individual Throttle Bodies Japan | eBay

linked up!

zerodameaon

That sounds like a pretty fun NA.

OV is about to turn this into an argument for the RB20 and its reasons for being better than the RB25 and up.

__________________

Need to adjust your idle?
http://zilvia.net/f/s-chassis/395413...-pictures.html

OrangeVirus1

no I'm not.

gearhead55

very cool, thank you. I wonder how much fab work would be required to put this on an RB25 head. Not quite carbs but similar.



Yea I think it would be.

4x4le

These are diesel compression ratios

OrangeVirus1

Yes they are, but they are safe on E85/98 or LPG propane.

On Gasoline, no.

stacksondeck

Here we go again. Show us one Nissan running 18:1, Virus.

Your retarded 'info' never ceases to amaze.

OrangeVirus1

Retarded info? or your blantant inability to read? ( and blantant inability to construct intelligent sentences )

How about fucking try again you fool.

This is a perfect fucking example people, Perfect fucking example. Subject A: StacksonDick Blatantly miss-reads what I post, then Starts with personal attacks. Perfect fucking example of the etiquette that is Zilvia.

I said CUSTOM PISTONS.. Did I ever .. EVER fucking say there is a Nissan with 18:1 compression..

DID I?

Now go fucking kill yourself.

stacksondeck

Hahaha aren't you leaving the forum?

Soooo, if no Nissan has them then how do you know enough to tell someone to use them? Did you tune a car with 18:1 compression?

We love it when you get mad Virus makes my day knowing your life is shit.

OrangeVirus1

Are you really that retarded to not understand what custom pistons are?

No nissan Comes stock with custom pistons.. BUT YOU DID NOT FUCKING KNOW THAT?

It was a mere fucking suggestions you retarded fuck. did you even tune your car AT ALL? Do you even understand the aspects that is tuning? Ignition timing? Air to fuel ratio? Exhaust temps? Volumetric efficiency ?

Like I said, Go fucking kill yourself.

my life is great haha thanks.

perfect fucking example people. StacksonDick. Perfect example of the shit I'm talking about. I say something, Directed at nobody, I get personally attacked because the person is too fucking retarded to know what custom pistons are.

stacksondeck

Lol I think you're missing the point. Have you EVER tuned, driven, seen a car with 18:1 c/r?

Don't try to change the subject. Just eat your words and tell us what they taste like.

OrangeVirus1

Dude please tell me you really aren't THIS retarded.. please.

OMG NO THERE IS NO CARS IN EXISTENCE WITH COMPRESSION RATIOS THAT HIGH.... oh wait.. Diesels.. what the fuck?

I've never personally tuned that high of a compression ratio on E / LPG but it isn't impossible.

You don't understand what 1. a suggestion is. 2. Custom pistons are.

Go fucking kill yourself.

dawagarage

can yall take that shit to PM and keep this thread on topic?

i was really interested in where this was going

__________________
formerly known as "hotboiblaze"

ratsun: dawa (73 datsun 620)
clublexus: properD (97 sc300)

dawagarage

so much so that it reignited my desire to stuff a z motor in my truck. its been done, but is not very common, and you gotta do a lot of digging to find anything about it.

here are some photos







the problem is the L6 is just too damn long.
you either have to relocate the radiator to the rear,
or you have to cut the fuck into the firewall.

anyways, back lets get back on topic

__________________
formerly known as "hotboiblaze"

ratsun: dawa (73 datsun 620)
clublexus: properD (97 sc300)