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R33 Rb30 Conversion

JNR24

By JNR24,
in Engines & Forced Induction

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Duncan
Duncan

Just thought I would bump this 20 year old thread because the Skid Factory have just posted up a video summarising a lot of the content, format might be more familiar for newer members

JNR24
JNR24

fyi guys, Well yesturday i picked up a RB30 for my conversion into my R33. I will be using my RB25DET head on the RB30 block. So i started stripping the motor down, pulled the crank, pistons, girdle

Cubes
Cubes

Here is all I have at the moment: http://www.geocities.com/r32_jjc/ Unless you are on broad band make sure you right click then save as. The file is around 120kb. If there is anything I have got w

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  • 3 weeks later...
cactus Collaborator

cactus

Posted
Posted
One of my fav cars at the moment. Engine combo is pretty insane.

Not bad for being built by a cement renderer lol

Can anyone tell me how thick the top of a CP piston for Nissan RB30/25 (86.5mm 9.0:1 comp) is, or roughly what it is?

Any info ASAP would be awesome.

  • 2 months later...
fr0st Experienced

fr0st

Posted
Posted

My head and block is getting machined up at the moment. Apparently my pistons were missing there spec sheet so I did a search and came up with 3 thou piston to bore... thought I just read another thread that said 3.5 thou is the standard. Should 3 thou be fine for CP flat tops?

Cheers

-Matt

  • 1 month later...
GTS-tt Contributor

GTS-tt

Posted
Posted

A big 2 thumbs up and thanks to all those who have contributed to this thread.... Effing fantastic!

Just wondering if there has been an update to the pdf doc? The latest version I can get my hands on is November 2007? btw this is not the one listed on page 1, that one is 2006.

I'm currently in the planning/purchasing stage of my RB30 build up. I currently own an R34GTT and I'm planning for more of a "budget build" where my max power at the rears will be capped at 250-300KW....eventually. With a shit load of torque of course for that V8 feel! Apart from the S2-RB30 block I'm planning to keep everything as is. Sitting at the correct height by modifying the engine blocks I'm hoping to use my standard R34 head, then bolt everything back up for a standard looking engine bay. In the beginning I'm even planning to use my standard R34 turbo etc. Might end up getting it high flowed and keeping it coz the cops here in SA are nazi's and I drive this car everyday.

I don't want to be that guy who after 350 pages still asks "does anyone know..."? But if anyone has any thoughts I'm open to ideas, more importantly if anyone knows the right people to speak to here in Adelaide it would be appreciated.

Cheers in advance guys.

JonnoHR31 Grand Master

JonnoHR31

Posted
Posted

the 25 head needs to be modifed around the vct feed. the vct feed needs to be welded up and then the head re faced. also doesnt hurt to chuck whatever gasket your gonna use against the head and make sure the surrounding water gallery will seal properly

HR31-PASSAGE Veteran

HR31-PASSAGE

Posted
Posted

hey guys i'm abit confused with something that info it says head needs to be modified but doesn't say what needs modifying. what does this mean by that?

ohh ok so my s2 R33 rb25det head wouldn't be a straight fit onto an already built rb30 block that was used for the rb25/30det set up previously would it? if the head needs to be faced...

bigmikespec Veteran

bigmikespec

Posted
Posted

Has anyone played around with a RD28 diesel block... Ive seen that the Allout R33 is using one and running quick times

Kind of off topic but I would also like to know if anyone has done it and wants to share some information... would love to know the rev limit set in the Allout R33?

HR31-PASSAGE Veteran

HR31-PASSAGE

Posted
Posted

Why are you not keeping the vct? Costs very little to do - there is even a thread on doing it without an external feed.

couldn't be bothered doing the extra work haha & you only lose acouple hp with out so i've been told...

got any links for the threads anyone?

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