R33 Rb30 Conversion

[Cubes]

I found the RB30 lower wouldn't fit as it fouled with the tensioner above the water pump.

[GTR-Ben]

I found the RB30 lower wouldn't fit as it fouled with the tensioner above the water pump.

Well yes it needs a little "modding"

[R32 GTSTT]

If everything runs to plan my RB25/30 will be complete this weekend. Last night bolted to top part of the RB20DET plenum onto the bottom part of the RB25DE plenum. Had i got look at it and noticed that on the runners of the RB25DE, the water jacket that runs alongs the plenum has a bung in the end of it, whereas the RB20DET has a nipple. Do i have to drill and tap this and pit a nipple in it, or can the hose be ran as where?

[Bl4cK32]

Its comes from the turbo waterline that runs around the back of the head. I just blocked off the line, where it separates into two at the back of the head.

[Cubes]

Drill and tap for me.

[Roy]

Sorry to ask the same question again...kinda hoping that someone may have since stumbled accross the info im after :confused:

What is the weight of the std RB30 rod, also the piston weight (separate weights pls)

Is there any difference between the R31, VL series I & II rods, and other than Argo and Carrillo are there any other manufacturers of RB30 rods.

Reading the early pages of the thread it seems that eveyone is running prep'd std rods, assuming 7,500rpm what is the SAFE limit of these puppies, figures of 350rwkws seem to be thrown around provided tune is close to the mark. Whatever the rule of thumb figure is i imagine that takes into account the lighter forged pistons ppl are running:confused:

Sorry about all the questions. :Oops: and yes i read the forst 35 pages of this thread last night

[Fitzpatrick Speed Works]

got my eagle 4340 chromoly forged h-beam rods today, they are a work of art!!! THere are a few mods that need to be done to accomodate them but they are nice and they are a better price than argo or carillos....i'll post a pic!!!!

stock rod= from memory its been a while since i weighed them but i think they were 525 grams.

the eagles are 590 grams or something and are rated at 130hp per rod!!!

[Sydneykid]

got my eagle 4340 chromoly forged h-beam rods today, they are a work of art!!! THere are a few mods that need to be done to accomodate them but they are nice and they are a better price than argo or carillos....i'll post a pic!!!!

stock rod= from memory its been a while since i weighed them but i think they were 525 grams.

the eagles are 590 grams or something and are rated at 130hp per rod!!!

Have you checked the thickness of the big end on the rod to make sure it fits the width of the big end journal on the crank? You should also test an RB big end bearing in the rod for entrapment.

[Skyrine-Dave]

Hi S13drifter...

thanks for confirming that the eagle rods are heavier than stock. I was told this a while ago and asked the question but no one knew for certain.

i just hope that they will be bloody worth it in the long run!

and i hope the extra weight doesnt affect things too much in terms of making power :Oops:

SK i think thats where these rods are modified... The RB30 rods are actually Chev 6" small block rods ??

[Fitzpatrick Speed Works]

eagles h-beams

[Skyrine-Dave]

god damn they make rb30 now.

I am pretty sure i had to get chev ones and get the big ends re-bushed etc etc to suit the rb30 crank..

either way they are eagle h beams for forged goodness

[Fitzpatrick Speed Works]

YEah they are the right width as they have been machined to take nissan gudgeons at the little end, so the little end bush is now 21mm instead of 22.78 that a chev is... and the big end requires the crank to be ground around 35 thou i think.... i haven't measured it all yet cause i only got them today, but due to the grinding i dont think they will take the nissan bearings rather the chev ones im unsure untill i look at it all or maybe even another bearing like a speciallised type from clevite 77 ect... and yes i have no doubt they are chev 6 inch small journal rods but if the shoe fits!!!

I have seen these used in another build ie. another rb30 but not twin cam head... they are slightly longer than stock and require the use of a metal head gasket ( not my best friend but will still work) of about 40 thou or 1mm to obtain an optimal quench of around .45thou!..

Cheers, Daniel

[Sydneykid]

I think you will find that they are basically 6.017" VG30 rods (RB30 is 6") with the wider big end and bushed for 21 mm gudgeons (VG30 has the bigger 22 mm gudgeon). The Chevy rod (being for a V8) is offset to allow for the shared big end journals. It is possible that Eagle are machining a Chevy rod, but I reckon the VG30 is a better starting point.

Good to see Eagle make a "small step for them" and a "large step for us". They are a good rod maker, you should be happy with the results.

As for weights, weigh the pistons and rod together and compare that with the standard piston and rod. I think you will find an advantage there.

[Roy]

As for weights, weigh the pistons and rod together and compare that with the standard piston and rod.  I think you will find an advantage there.

Yeh was thinking that but if i dont need the rods for the added strength they offer, i want everything as light as possible...no point having rods capable of 450rwkw if im only making 350rwkws, especially if it means paying more and having extra weight....is there a gaping hole in my logic?

[Sciby]

I dunno if it's a gaping hole, but personally I'd prefer to have that extra tolerance headroom on the rods, rather than getting to 340rwkw and wondering when something may or may not let go.

Ability to rev slightly harder/faster Vs Peace of mind.

[Jaws]

I also have a question about aftermarket rods.

Has anyone tried or heard feedback on Crower rods.

They make them for the rb30 http://www.modyourcar.com.au/product_info....roducts_id=3007

Also been considering Arias forged pistons. http://www.modyourcar.com.au/product_info....products_id=528

Are there any other things I should be asking in regards to the above parts?

SK- My own RB31DET has 268 inlet and 272 exhaust both with 10.5mm lift.

What kind of power do these cams make?, is it ok for a daily driver?

You are no doubt aware that RB25's have hydraulic followers and that you would be limited to ~256 degree cams with ~9.2 mm lift to retain the VVT. This means no change in valve springs is neccessary.

What power is possible with the above cams mentioned?.

PS: I have all the support systems etc..

[Sciby]

Don't quote me as an authoritive source (look to SydneyKid for that), but beyond 260 duration, it becomes less and less streetable... you might be pushing it with those cams, but as per usual, YMMV.

[Guilt-Toy]

when you guys are making the RB30DET's from the RB25DET's are you adapting the RB25 side mount oil cooler ?

Apparently the rb30 has a one way valve in the way instead of a proper bush that the rb25 uses to pass the oil to the oil cooler which is cooled by the cooling system??

My RB30DET is going to be modded to accept the oil cooler as oil temps in RB30DET's is definatly something that needs to be watched.

Anyone else done this or know anyone to do it with their RB30DET Hybrids ?

[Bl4cK32]

Im just gunna fit the grex kit ive got to cover the oil issue (only really need it if you wanna do some track work)

As for rods...well ive asked this question before....decide what you want the car for. I set my limit at 350rwkw. Std rods, ive been told, will hold. I couldnt justify spending another $1800 - $2000 on top of the $5500 ive already spent on the rest of the motor, just to push it past the 350 limit.

It is a RWD car, and i can already see huge traction problems...Id rather spend the extra dosh on tyres and suspension mods to get the 350rwkw to the ground first

[GTR-Ben]

when you guys are making the RB30DET's from the RB25DET's are you adapting the RB25 side mount oil cooler ?

Apparently the rb30 has a one way valve in the way instead of a proper bush that the rb25 uses to pass the oil to the oil cooler which is cooled by the cooling system??

My RB30DET is going to be modded to accept the oil cooler as oil temps in RB30DET's is definatly something that needs to be watched.

Anyone else done this or know anyone to do it with their RB30DET Hybrids ?

Just need to fit the Skyline part from another RB block so that the adaptor seals.

I have done this. I have a HKS oil cooler with remote filter mount etc.