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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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Orphan Contributor

Orphan

Posted
Posted
I dont think theres many engines you could bore out a whole 500cc.

Heh yeah thought it was a fair bit, worth asking though. Just another quick question, does using the rb26 crank change the RB25 capacity?

lol how much are those turbo's gonna set you back? probs more cash then I have in the bank lol.

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R32 TT Mentor

R32 TT

Posted
Posted
test bed so we can compare turbo's. I've been thinking about teeing up one of the garrett suppliers to help me test different turbo's and get some results. Same engine only thing that gets changed is turbo's.

I would ~love~ to be able to try both.. trouble is no wants to loan me turbos - go figure...

You go the 2530's matt and ill try out the GT-RS's :)

I'LLLL KICK YOUR A$$ !!!! oopss.. sorry.. just my naturally competitive nature plus a little Tourettes syndrome possibly.... :dry:

Actually its a pity we're not in the same town - you can only really tell when you 'drive' each other car. But hopefully the Dyno will probably give us an idea. Be good to compare for sure.

Mmmm... boost at 3000rpm... giddeup!

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benm Grand Master

benm

Posted
Posted

I'm happy to go 26/30 with 2530's, all I need is the RB30 + conversion parts, the rest is there. Actually all I need is an engine builder that can do the whole thing for me :D

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Craved Grand Master

Craved

Posted
Posted
I'm happy to go 26/30 with 2530's, all I need is the RB30 + conversion parts, the rest is there. Actually all I need is an engine builder that can do the whole thing for me :ermm:

have you spoken to Jamie about it Ben ??

im sure he would be willing to do this for you.

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benm Grand Master

benm

Posted
Posted (edited)

Yup he said he could do it (said he built Dan's 25/30) and also has a spare rb30 block but just not sure if I should go to an engine specialist with more experience due to the importance of getting it 100% right and all the custom work required.

Edited by benm
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Craved Grand Master

Craved

Posted
Posted
Yup he said he could do it (said he built Dan's 25/30) and also has a spare rb30 block but just not sure if I should go to an engine specialist with more experience due to the importance of getting it 100% right and all the custom work required.

umm what custom work ???

most of the parts for these conversions are available pre made, such as crank collars, 4wd adapter plates etc

more than likely he would be using nepean engines on correen Av for the machining work (same guy did my block prep)

has done Dans engine, can confirm this

he will be doing some of the oil feed work for my rb25 head, as he did it a clever way for Dans engine.

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Craved Grand Master

Craved

Posted
Posted
just on an offnote. the crank collar adaptor is there so we can install a bigger/better oil pump correct?

if not can someone explain?

originally i was under the impression it was required/created for r32GTR cranks to be able to run the later model R33 GTR pumps which utilise the larger area

but now it seems normal for people to suggest fitting it..

personally

i'm going to be running the rb25 oil pump on the first motor, so im not going to install one on this engine.

std bottom end, cant really justify the cost of the unit and install, built motor with N1 will get it

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Cubes Grand Master

Cubes

Posted
Posted
just on an offnote. the crank collar adaptor is there so we can install a bigger/better oil pump correct?

if not can someone explain?

All it does is provide a full length drive for the oil pump. Where as std (rb30, rb20, r33 rb25 series 1, & R32 rb26) all have a really small drive that doesn't cover the whole of the oil pumps drive.

I've attached a pic that I saved when some one popped an oil pump.

You can see how the standard oil pump drive is not the full width of the gear.

And attached the jun oil collar.

post-382-1158056439.jpg

post-382-1158056444.jpg

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r33_racer Grand Master

r33_racer

Posted
Posted

This is the difference of the two drives.

post-12828-1158056889.jpg

I think even for a standardish build, oil pump and collar are a must. Because it seems that alot of people seem to have the oil pump failing problem. Whether its the gear breaking, or screws coming loose from vibrations or just old age. Since its sort of an essential item to the overall life of an engine it should be considered with more importance.

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Cubes Grand Master

Cubes

Posted
Posted

Craved,

originally i was under the impression it was required/created for r32GTR cranks to be able to run the later model R33 GTR pumps which utilise the larger area

It doesn't really have anything to do with the later modem r33 gtr pumps as all the gtr, rb20 and rb25 pumps have a gear width greater than that of the drive, so they ALL benifit by running the full drive.

RB20's and rb25's have been known to suffer the same fate as the gtr's.

The RB30 oil pumps have an internal gear that is near the same size as of the standard drive.

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SirRacer Experienced

SirRacer

Posted
Posted
Craved,

It doesn't really have anything to do with the later modem r33 gtr pumps as all the gtr, rb20 and rb25 pumps have a gear width greater than that of the drive, so they ALL benifit by running the full drive.

RB20's and rb25's have been known to suffer the same fate as the gtr's.

The RB30 oil pumps have an internal gear that is near the same size as of the standard drive.

what do you mean by it covers the full length drive of the oil pump?

if im using an r32 rb25de oil pump on rb30 it will still work?

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Cubes Grand Master

Cubes

Posted
Posted
what do you mean by it covers the full length drive of the oil pump?

if im using an r32 rb25de oil pump on rb30 it will still work?

The oil pump has an internal gear that is wider than the lug on the crank that engages with the oil pump to drive it.

By fitting the crank collar this then places even pressure across the oil pumps internal gear.

RB25de oil pump from what I've seen looks the same as the rb20 pump, unsure if pressure is the same would need to look it up in the engine manual for that one. :D

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Craved Grand Master

Craved

Posted
Posted (edited)

hmmm might have to look at this

have the rb30e oil pump at home, and an RB25det one too

my first rb30 i am rebuiling for under $1500 as i cant afford the full build forged internal ones atm .. and i already have another long engine sitting there .. so i guess i will try and see ... if it goes boom it goes boom.

Edited by Craved
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Craved Grand Master

Craved

Posted
Posted
i must be taking ages to comprehend this so having a bigger drive and the pump engaging more means is spreading more oil/more oil more evenly etc?

doesnt affect how much oil is pumped

just is used to prevent oil pump failures due to uneven pressure on its internal gears, which can cause them to crack like in Cubes' post above .. see red circles

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