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RB30DE bottom end

doxximus

By doxximus,
in Engines & Forced Induction

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meggala Grand Master

meggala

Posted
Posted

ok I spoke to a guy in qld how has done this N/a like you want

couple of issues

you use the the rb25 de pistons as they fit and you get 10.5 to 1 compression nice and you need you set up an oil line for the vvt to work when you get closer I'll mail him

read this and you could pm him

http://www.automotiveforums.com/vbulletin/t41006.html

he reckons its very nice and smooth good luck with it I think it will rock you might get a surprise and find some real power.

meggala

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vjsam Apprentice

vjsam

Posted
Posted

meggala - i was under the impression us rb25de boys wont need the oil feed as we already have it?? or is it that the rb30 block does not have the line where as the rb25 block does? i gotta pm rb30-zed and ask him more...engine management looks tricky too. he's using a delco ecu (from holdens, etc...) don't know how this would affect abs/4wd/auto ect...

sounds interesting.

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vjsam Apprentice

vjsam

Posted
Posted

i emailed steve the guy with the rb30de - and the conversion is apparently "quite simple" :(

Hi there Virantha,

I live up in Wollongong NSW, let me know if you are passing one day.

the converion would be simple on your car, but things to keep in mind are :

* the RB30 block is about 40mm taller than your block so you will have to

look at clearance between th throttle body and the bonnet.

* your RB25 block has a internal oil supply to the VVT and the 30 has not,

so you will have to run a external oil line to the passage way in the head

and seel off the lower part of the passage way to stop oil getting back to

the water passage, have a look at the photos of the head at

http:/au.photos.yahoo.com/arkij60

Also are you sure that your compression ratio is 10.5:1 as my RB30 block

with RB25 pistons and head give me 10.5:1, if you are 10.5:1 now and do this

converion with your old pistons it would be about 12:1

I think your motor would be 9:1 now. But ever wat another 500cc makes a big

difference.

The reason i used the Delco system is that it was running my older L28

engine and is a very good system.

What do you think of the RB25 engine?

Steven

[/quote:183cd5627e]

hmmmm - gotta check the clearance for the extra 4cm...

i was under the impression that if you do change the bottom end of an engine - you don't change the compression?? ie it would remain at 10.5?

i don't see why the turbo boys can't do this too! - rb30det :D

this mod would ROCK - and keep the insurers happy...

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