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RB Motor with Triple carbs, Can it be done? Z432 Z432-R


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#1 Hunter

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Posted 21 April 2010 - 03:00 AM

I know there is alot of electronics etc on the RB motor, but is their anyway that you could hook up triple carbs to an RB motor?

It would be basically removing the injectors and replacing with carbs,

vacuum signal would have to be taken somewhere. maybe a airbox over the carbs could give a balanced vacuum signal.

Could the engine run without the computer controlling injectors? It would be very complex if it could be done. Anyone with RB experience chime in with your thoughts.

#2 gav240z

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Posted 21 April 2010 - 04:55 AM

Of course, an ICE only needs fuel and air to run. It's been done before in Japan there were a few S30's and even some Skyline C10's with RB25 engines that were converted to Carburetors.

The big question is why though? EFI has so many advantages and I imagine the EPA would not like it either. I'm fairly certain the rule books say that an engine swap must conform to the emission standards of the year the engine was produced.

It may be different with a 240z shell since they were pre-emission but anything after 75 I think you have a problem.

I have no experience myself with RB motors so I'm not the best to advise on the topic.



#3 NZeder

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Posted 21 April 2010 - 05:59 AM

Sounds like we are lucky here in NZ no emission for post 75 not until 89 ;)

Back to the question at hand - yes can and has been done. You would need a custom intake manifold or modify a RB26 intake manifold to fit on the RB25/20 head (whatever you are going to use). If using the RB26 intake manifold you will need to make some adaptors to go from the RB26 TB pattern to DCOE/PHH/DHLA pattern. Re EFI vs Carb - well if the carbs are setup to for the engine correctly they will perform very well and be right up there with EFI so no lose.

I have considered this myself - safe me a lot of wiring on the car :( never know might do it yet ;) just need a plan for a dizzy and keep it very old school.

Not much electronics on a NA RB, Knock Sensors, CAS, Water Temp for ECU, Coil ignitor, coils and injectors rest is standard engine electronics/electrical stuff, alternator, temp and oil gauges that is about it really.

#4 Zedman240®

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Posted 21 April 2010 - 08:11 AM

I was almost there with the setup I had; I made my own triple manifold for the RB25 head (approx $300) and then all you need is a system from MSD that can take the signal pulses from the CAS, and run a coil pack. I think they have a system but it costs around $500. You may not be able to fit a distributor as the sensor bolts to the front and may poke into the radiator. Plus running a coil pack, you will have a bullet proof ignition system good enough for 10,000 rpm. Look at the MSD website and have a dig around..

#5 zzzzed

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Posted 21 April 2010 - 02:52 PM

i once sore a vg30 with webbers on top. it did look cool. I think it was in a datto 1600

#6 Hunter

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Posted 21 April 2010 - 04:35 PM

The reason I ask, is I want to make a Z432-R or Z432 Replica.

Basically a RB20 to match the 2.0L donk in a 432. possibly a RB25
Triple Dual throat carbs.
A custom made airbox made to look similar to 432 air box.
Extrators 6 into 2 with twin exhaust.
Doubt I will find 432 mags, so Black Rota Grids would do.
Custom plug cover to match the 432 motor.
Paint the plug cover and cam covers to match the 432 motor.
Possibly 432 rear spoiler.
Possibly source all the extra little things that makes a 432 a 432.
clock, tacho, rear bumber rubber, etc etc.

Car body colour would be Orange with black bonnet. or 432 Gold with black bonnet.

Does anyone know the paint code or equivilent for the 432 Gold?


#7 Zedman240®

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Posted 21 April 2010 - 05:59 PM

Ive seen 280ZX wheels painted black to resemble the 432 / Safari Rally 240's pattern. Only downside is they are 14". Cheap and plentiful! 432 badges pop up on eBay now and then but the rocker cover will be the biggest challenge I think.

#8 Hunter

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Posted 21 April 2010 - 06:17 PM

Dimitri, I was thinking I could make a cover to go over the top of the motor whole motor, weld tabs onto the cam covers and screw it on that way.

Do you still have the RB Triple carb manifold? That I could either copy or buy? I would like to plan the project first though to make sure it will work, and I will also need another shell.

The 280ZX wheels would be a good option as 432 I am guessing come with 14" wheels. but from reading the 432-R was released with steel wheels and was mainly sold to race teams, who put their own wheels on the car, Watanbe's or similar.

#9 Hunter

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Posted 21 April 2010 - 07:20 PM

432 images

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#10 RB30X

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Posted 21 April 2010 - 07:35 PM

Best of luck in your quest, I'll be watching and drooling.
Will triple carbs physically fit on an RB twin can head? Strut tower wise I mean.

#11 xa1973

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Posted 21 April 2010 - 07:40 PM


Back to the question at hand - yes can and has been done.

;)

#12 Zedman240®

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Posted 21 April 2010 - 07:42 PM

Found my older build thread when I started my RB25DE conversion:
http://www.viczcar.c...ic,2377.30.html

Read through and see how  the manifold was done.. triples should fit without any issues as my throttle bodies which are almost the same dimensions to a Weber carb fit easily. The only clearance issue I had was a fuel return line from the fuel rail came very close to the clutch master; carbs sitting on the opposite side means more things in the way! One other detail you will have to do is the throttle linkage. Rather than trying to get the mechanical one mated, I got a cable from a TE Magna. Worked like a charm!

#13 Hunter

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Posted 21 April 2010 - 07:55 PM

Thanks for the info, I could always get different motor mounts and tilt the engine the opposite way. But looks like it would fit. Would it fit with an airbox though?

Also would the throttle linkage out of an American 240Z fit? Seeming they were RHD and the linkages come from that side somewhere. But the cable setup should fix those problems.

#14 NZeder

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Posted 21 April 2010 - 07:56 PM

Also check my thread out on my Triple DCOE Throttle Bodied RB25/26DE setup. I am thinking I might hunt down some Mikuni 44 PHH or get some new OER 45 for the carb setup....I am very seriously thinking of doing this and have been for sometime - comes down the $$ I already have tied up in the DCOE throttle bodies and ECU

My thread http://www.viczcar.c...pic,3490.0.html

My zed is a Z432 project theme also - but Green with a matt black bonnet, RB engine painted silver like the S20 blocks, twin exhaust setup like the Z432 - it will never be a Z432 just a modern take on the theme. PS30 = 2000cc DOHC Z432. My car RS30 = 260z so factory L26 2600cc (well close enough) now RS30 = 2600cc DOHC Z432 theme 260z. I have 2 sets of 432 badges, 1 set NOS and 1 set close to new with 2 of them missing holding pins.

I am going to custom make/modify a rocker cover also but with 2600 on the top not 2000 again for the overall theme of the keeping with in the original car and a modern Z432.

Go forth and enjoy ;)

EDIT: Re you post on the "yes please" thread on the gold colour = Safari Gold paint code 920. My zed is 907 GP Green/Racing Green which was used on the Z432 as well as other models (both export and domestic) however it was replaced in 71 with metallic greens. That Z432 looks like was known as GP Red/Monte Carlo Red code is 905

#15 Hunter

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Posted 21 April 2010 - 08:30 PM

Thanks for the info nzeder and dimitri. and on paint colours.

I will check out both posts. I will have to find another car for this project, a 240Z preferably.

I will keep my yellow one as a RB25DET.

#16 Hunter

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Posted 22 April 2010 - 12:19 AM

To answer my own question yes it can be done. The Carbs are hiding over the side of the motor.
Found this on Rocky Auto.

http://www.rockyauto...ail.php?id=1641

Maybe I could buy parts off them to get it done.

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#17 zzzzed

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Posted 22 April 2010 - 03:37 AM

i could be wrong but that looks like ITB injection

#18 Hunter

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Posted 22 April 2010 - 04:50 AM

it did have solex written in the description, bit hard with google translate.

but if you look carefully it looks like the top of carbs on the intake

#19 Hunter

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Posted 22 April 2010 - 07:36 AM

If they are carbs on that RB engine above, they look as if they would have to be mounted fairly closely to the head like the picture below of an S20 engine.

Also that exhaust manifold looks dangerously close to the battery, but could be the veiwing angle.

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#20 NZeder

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Posted 22 April 2010 - 08:40 AM

I checked my PC but I don't have any pics of when I had the engine in and I was test fitting the intake/exhausts up. But if you check my website there is a pic in the galleries section showing you the length of the RB26 intake manifold with the TB's installed and the trumpets.

Now I can tell you that stock clutch MC would not work with these trumpets where my engine sits but I replaced the MC with a Titlon 75 Series unit of the same bore as standard. These 75 series are nice and short in the body and bolts right on to the zed mounts with no mods :) so that has to be good right? But to give you the idea the bell/widest part of the trumpet was close to the clutch MC.

Having said that when I did all this test fitting the car was still on the rotisserie (well lowered the body over the engine and then removed and place on axles standard) and I only installed the cross member with the engine/gbox so no suspension and stuff so things might still move a bit more when I install in the hole later.




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