Rb30 Conversion

[SkyHi_33]

Heya,

Am thinking bout rebuilding my engine but the quotes ive been given this week are ridiculous, so im thinking of building up my own rb30 bit by bit and eventually drop it in the car.

What i want to know is who here has done it and can give me some guidance if i require it? I've researched it a bit (not enough to go and do it right away) but want to know if you guys have had any specific issues with it? Only chasing 250-300kw and have heard of people doing it on stock bottom ends, how safe is this? What are some places people had experience with machining etc. if i want to rebuild it with fogies etc.

My goal is to have a responsive and reliable motor for track and hill climb, therefore power is not the biggest issue.

Budget $2,500 - $3,000

(ps, its in SA section because i want to get local opinions and answers)

[ovrtym33]

  tx3_90 said:

Heya,

Am thinking bout rebuilding my engine but the quotes ive been given this week are ridiculous, so im thinking of building up my own rb30 bit by bit and eventually drop it in the car.

What i want to know is who here has done it and can give me some guidance if i require it? I've researched it a bit (not enough to go and do it right away) but want to know if you guys have had any specific issues with it? Only chasing 250-300kw and have heard of people doing it on stock bottom ends, how safe is this? What are some places people had experience with machining etc. if i want to rebuild it with fogies etc.

My goal is to have a responsive and reliable motor for track and hill climb, therefore power is not the biggest issue.

Budget $2,500 - $3,000

(ps, its in SA section because i want to get local opinions and answers)

ummmmmmmmmmm.........u wont get 1 built that cheap, you will need atleast double or triple that

contact nisspeed or lewis engines

its not as easy as u think, theres a lot things u need to factor in

[Madaz]

http://users.tpg.com.au/cobra30/twincam.htm

http://www.ripsltd.com/index2.html

RB30 Stock internal bottom ends start at NZD$4,000 rwd or $5,000 4wd (suit up to 600hp and 7200 rpm)

$4000nzd = 3,243.59 AUD and shipping fron NZ is about 400-450

EDIT

http://www.skylinesaustralia.com/forums/R3...ion-t15420.html

bottom of first post has a download

[nos man]

if you want reliable and responsive motor why not just go forgies and a turbo to suit?

[ovrtym33]

  Madaz said:

http://users.tpg.com.au/cobra30/twincam.htm

http://www.ripsltd.com/index2.html

RB30 Stock internal bottom ends start at NZD$4,000 rwd or $5,000 4wd (suit up to 600hp and 7200 rpm)

$4000nzd = 3,243.59 AUD and shipping fron NZ is about 400-450

as steve said above then add on installation, tuning, etc etc.........................

goodluck

[Madaz]

at least with rips put your money into the main part a short motor and use your gear to get it up and running if your mechanically minded and have a daily then it shouldn't be too hard to follow online manuals there are plenty about

EDIT

Son an RB30DET would be a responsive motor with the right turbo

[nos man]

  Madaz said:

EDIT

Son an RB30DET would be a responsive motor with the right turbo

but there's no reason why a rb25 won't be responsive with the right set up!

[Madaz]

more cubes are always better Son means same power for less effort = engine last longer

i would has at a guess and say the Red 240z is running the 20k package with out the AWD sump

[Madaz]

[Madaz]

[SkyHi_33]

key to me spending 2.5-3k is I'm doing it myself. i know that obviously no one is gonna build me one that cheap, there's a lot of labor in it.

I'm not a complete idiot when it comes to this either, I've had experience in rebuilding a volvo turbo motor as well as a rubbish vt ecotec through tafe so have a pretty good idea of how things are done.

Thanks heaps for the links steve, got a bit of reading to do eh?

Reason why do it with an rb30?

1. torque

2. bigger displacement is always a good thing

3. matched with the right turbo and set up properly it would give me better results than doing the same with an rb25

4. rebuilding my motor (rb25) myself would cost roughly the same

5. id rather have my car running as long as it can while i build a motor for it

[D_Stirls]

AFAIK his 240Z engine still runs the standard block, crank and crank girdle. So no it's not the 20K version as that engine has an aftermarket full crank girdle with billet main caps.

TX3 i still don't think you are going to be able to do it for 2.5>3K. Pistons and rods you'd be looking at nearly 2K (if your going to do it properly) having said that the i think SPOOL do a piston and rod kit for around the $1400 mark for an RB30 bottom end. machining and balancing (balancing need to be 110% with a long stroke engine like an RB30) you'd be looking at another $3-500 ARP studs for mains and head studs $2-300 full gasket kit $300, decent turbo like a GT3071 or 76R your looking at $1700-2200 etc, etc. and these are just parts

EDIT!! No i was wrong about the spool package it's $2190 not $1400 (thats more like the CA price)

http://www.spoolimports.com/content/SPOOLC...TONPACAKGES.asp

Edited April 10, 2009 by D_Stirls

[nos man]

you're choice but if you shop around you'll find that it's cheaper than you think to rebuild the rb25! jjr selling autech rods are around $700-800 mark and cp pistons from jjr $1200 and these are just examples so you do the maths if it'll be roughly the same price!

on another note when running rb30 bottom and rb25 head does it get bored out? and by how much?

[ovrtym33]

  tx3_90 said:

key to me spending 2.5-3k is I'm doing it myself. i know that obviously no one is gonna build me one that cheap, there's a lot of labor in it.

I'm not a complete idiot when it comes to this either, I've had experience in rebuilding a volvo turbo motor as well as a rubbish vt ecotec through tafe so have a pretty good idea of how things are done.

Thanks heaps for the links steve, got a bit of reading to do eh?

Reason why do it with an rb30?

1. torque

2. bigger displacement is always a good thing

3. matched with the right turbo and set up properly it would give me better results than doing the same with an rb25

4. rebuilding my motor (rb25) myself would cost roughly the same

5. id rather have my car running as long as it can while i build a motor for it

you should buy a blown engine n build that 1 up, that way u can stiil drive your car until its built, and if u get defected u can drop your old engine back in

ive got the perfect turbo for it sitting at home, a garrett gt30/40 with .82 external gate exhausting housing, cubes uses the same turb on his rb25/30 i think but is interl gate

[nos man]

Dan the guy wants to do hill climbs and not powerslide off cliffs with your turbo!

[D_Stirls]

  nos man said:

on another note when running rb30 bottom and rb25 head does it get bored out? and by how much?

No 25, 26 and 30 bores are all 86mm so there is no boring required unless you are using a 20 head. With the 25 head you have to do something about the oil feed for the VTC but there are a few solutions if you look around.

When i build mine i'll be using a 26 head as it is already solid and you don't have to play around with any oil galleries (apart from what you already have to do in the 26's i.e. restrictors and such) i will be retapping the block to take the bigger head studs that the 26 uses but there is some debate about doing this.

P.S. i though cubes used a GT3071R??

Edited April 10, 2009 by D_Stirls

[ovrtym33]

  D_Stirls said:

P.S. i though cubes used a GT3071R??

i think he using .63 exhaust housing

[nos man]

  D_Stirls said:

No 25, 26 and 30 bores are all 86mm so there is no boring required unless you are using a 20 head. With the 25 head you have to do something about the oil feed for the VTC but there are a few solutions if you look around.

so nothing to do with displacement? just longer strokes is where the extra torque comes from?

Edited April 10, 2009 by nos man

[SkyHi_33]

  nos man said:

Dan the guy wants to do hill climbs and not powerslide off cliffs with your turbo!

haha too right... not after lag than instant smoke show.

  ovrtym33 said:

you should buy a blown engine n build that 1 up, that way u can stiil drive your car until its built, and if u get defected u can drop your old engine back in

i have thought about this also, well still thinking about all this stuff, hence why i made a thread to see who has actually done it in SA. Anyone keen to take me for a short spin ? Really keen to find out what the response and driveability are like.

Edited April 10, 2009 by tx3_90

[SLED]

  nos man said:

so nothing to do with displacement? just longer strokes is where the extra torque comes from?

longer stroke also = more displacement......even if you don't touch the bores.

seriously though, unless you have access to internal & external micrometers, plasti-gauge, torque wrenches, etc or understand the importance of sequences, preparation for initial fire up and absolute cleanliness.......don't even think about assembling your own motor.