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R33 Rb30 Conversion

JNR24

By JNR24,
in Engines & Forced Induction

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Adriano Grand Master

Adriano

Posted
Posted
Interesting.. Whats with the 2 lumps in front of each cam shaft on the cam belt then? :P

It was an N/A that I had a look at, I wouldn't have thought the turbo head would be any different.

??? The cas still bolts to the front of the exhaust cam, but it has a different spline

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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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Alf Proficient

Alf

Posted
Posted

Are there any differences in the 26 and 30 headgaskets?

I have a VVT 25 head thats had the front right water jacket and oil gallery welded up and the water gallery shaped to suit the 30 block.

There appears to be more thicknesses available for off the shelf MLS headgaskets for the 26.

Cubes Grand Master

Cubes

Posted
Posted
is there any issues running the RB25 gasket with the rb25det head?

obviously the oil feed is different, and will be modified for VCT externally..

Nope. I'm running the Cometic RB25 head gasket on mine without issues (~40,000kms). The price difference between the rb25 and rb26 was considerable at the time. I got mine from memory for $150.

Craved Grand Master

Craved

Posted
Posted
Nope. I'm running the Cometic RB25 head gasket on mine without issues. The price difference between the rb25 and rb26 was considerable at the time. I got mine from memory for $150.

i got mine cheap but not THAT cheap ...

the rb25 cometic im running on the rb25 in the car cost me $330 :D

got some ACL piston rings, so its almost wash and build time :O prob 3 weeks

Alf Proficient

Alf

Posted
Posted

Thanks for that Cubes.

I've been looking at the cometic and ACL race series MLS gaskets, Prices ive got ranged from 210-350 for an RB30 MLS headgasket.

is there any issues running the RB25 gasket with the rb25det head?

Its not really an issue with a 33 25 VVT head that I've seen but there is a 1-2mm of sealing on a particular spot on the front right water jacket. That is when you use a 30 block.

Just to be on the safe side I tigged the water jacket and VVT gallery up in the head and shaped it to suit the water gallery in the 30 block. Theres a min. 5-6mm of sealing now.

It was a better option that trying to braze weld brass to the side of the block like in this pic.

http://www.users.bigpond.com/twinvl/blockmod2.jpg

w0g7oy Rookie

w0g7oy

Posted
Posted

I heard the Non turbo rb30 pistons have less rings or sumting like that.. and dont cope with boost very well...

wen i was gonna turbo my rb30e, i was being told that the compression had to be lowered a fair amount from 9.0:1 to around 7 or 8:1 to stop pinging and detonation...

Why is it ok for a hybrid motor to have higher compression ratios? wont it ping/knock its tits off??

Jimbo

Adriano Grand Master

Adriano

Posted
Posted

Whoever told you that didn't know what they are talking about

I heard the Non turbo rb30 pistons have less rings or sumting like that.. and dont cope with boost very well...

wen i was gonna turbo my rb30e, i was being told that the compression had to be lowered a fair amount from 9.0:1 to around 7 or 8:1 to stop pinging and detonation...

Why is it ok for a hybrid motor to have higher compression ratios? wont it ping/knock its tits off??

Jimbo

mr_rbman Grand Master

mr_rbman

Posted
Posted
I heard the Non turbo rb30 pistons have less rings or sumting like that.. and dont cope with boost very well...

wen i was gonna turbo my rb30e, i was being told that the compression had to be lowered a fair amount from 9.0:1 to around 7 or 8:1 to stop pinging and detonation...

Why is it ok for a hybrid motor to have higher compression ratios? wont it ping/knock its tits off??

Jimbo

putting the 25/26 head on actually lowers the compression!

Cubes Grand Master

Cubes

Posted
Posted
Why is it ok for a hybrid motor to have higher compression ratios? wont it ping/knock its tits off??

1. Because its a hybrid motor. Better designed head that allows you to get away with a little more static comp. :)

2. Its all in the tuning. Simply throw a stock rb30et ecu on an rb30e that has a turbo bolted on to the side of it and try to push 14psi through it and it will almost certainly detonate. So tuning tuning tuning.

Cubes Grand Master

Cubes

Posted
Posted
So the guys running the R32 RB25DE heads. What sort of power are you guys putting through the inelt manifolds...has anyone gone to an aftermarket one and noticed an improvement in response/power

Hey fancy seeing you in these neck of the woods. :whistling:

AM-Performance is about to drop an aftermarket plenum on his within the next week or two.

Sky30 pushed 312rwkw through his r32 rb25de head running the stock exh. manifold and stock inlet manifold/plenum.

Thats the highest I know of on the R32 RB20/25 style plenum.

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