Jump to content
SAU Community

Recommended Posts

HI all

Joel WROTE

There is an issue.. Apparently the RB oil pumps have a different size gear i.e NA and ET pumps have a different size gear how is the over come?

looking at the oil pumps the diffrence is in the width of the gear ,I will use the oil pump from my 25t as the gear is considerably wider and as such will pump more oil / flow.

have got oil squirters installed ,what a mission!!!, the Rb30 block has only 3-4mm metal in the casting before you enter the oil gallery (the 25t block has over 10mm).Ended up having to tap out to 3/8 bspt thread and installed the squirters into brass plugs,height of sqirters is a real issue as the crank has minimal clearance to the block,alot of mucking around I hope it is worth it.

Mayby someone can shed some light on the effectivness of the oil squirter install,I suspect that unless its a high boost+high rev drag motor the oil squirters are not really necessary (they are painfull to install).

Motor is about 1/3 reasembled ,im off to carry on.

cheers

Well basically I image it is why the RB25's and RB20's are able to make so much power before having forged pistons fitted.

For example the VL Turbo isn't able to make 260rwkw on standard pistons. The ol' VL Turbo's have many story's of melting pistons.

Originally posted by 25t

HI all

Joel WROTE

There is an issue.. Apparently the RB oil pumps have a different size gear i.e NA and ET pumps have a different size gear how is the over come?

looking at the oil pumps the diffrence is in the width of the gear ,I will use the oil pump from my 25t as the gear is considerably wider and as such will pump more oil / flow.

have got oil squirters installed ,what a mission!!!, the Rb30 block has only 3-4mm metal in the casting before you enter the oil gallery (the 25t block has over 10mm).Ended up having to tap out to 3/8 bspt thread and installed the squirters into brass plugs,height of sqirters is a real issue as the crank has minimal clearance to the block,alot of mucking around I hope it is worth it.

Mayby someone can shed some light on the effectivness of the oil squirter install,I suspect that unless its a high boost+high rev drag motor the oil squirters are not really necessary (they are painfull to install).

Motor is about 1/3 reasembled ,im off to carry on.

cheers

Yep 25t,

i was looking into the oil pumps to see if there was some size diffrences between all the RB motors and there is.

The difference is the gear width:

RB30E - 10.8mm wide

RB30ET - 13.4mm wide

RB26DETT - haven't measured, but looks like about 15mm wide or so to the eye.

Now, this wasnt measured by me. But from this we can accuratly say that running a RB26 Oil pump wouldnt hurt. Also i think the water pumps are diffrent also. (slightly) I will take a look tonight once i get the package. (RB26DETT oil & water pump)

Trev,

Doh...

I've got a series 1 calais. Do u think i would be better just getting a turbo block or a series 2 block?

On another note...Where you saying that the standard rb30 rods and pistons and suitable for this conversion? I know they are probably not recommended but what sorta power do u think they could withstand?

Cheers

The crank & rods are all the same in the NA and turbo motors.

Gotta luv nissan :)

Have a look on previous pages it states how much power/torque the standard rods can handle.

Don't get a turbo block.. Why? Its the same as a NA block with lower comp pistons.

A quick question, how much machine has to be done to make the rb20 head fit a rb30 block as I want the standard look with less turbo lag, stacks of torque and around 200kw at the treads.

I already have a spare rb20 det thats why i'm asking and I can get the machining for free.

Hi Rowdyr32, RB20 head won't fit RB30 block, bore size is different (78 mm versus 86 mm). RB25 and RB26 are 86 mm like RB30 so you can use a RB25DE or RB25DET or RB26DETT head on RB30 block.

Doing an RB30/RB25 hybrid for 200 rwkw would be a waste of time and money. You can easily get 200 rwkw out of an RB20DET and still have a broad power band, you just have to tune it right and select the right turbo and support systems. Check the posts, there is plenty of info on how to do it.

Hope that helps

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now



  • Similar Content

  • Latest Posts

    • Hey guys, Just want some advice on r34 GTT ac system. Since I’ve owned it, the ac compressor, doesn’t matter the set temperature or ambient temperature, runs for around 10 seconds then disengages the clutch, then re-engages everywhere 30 seconds or so and keeps repeating this.    is this normal?   I had it recharged today as it was slightly low and thought it would fix it but still does it. it cools fine in summer even prior to the recharge, except for the usual warmup when stopped or in traffic (still yet to wire overheat fan to on with ac)   any thoughts would be much appreciated 
    • To plug the hole. The engine plant may not have known whether the car it was going into had a gauge or not. It was a long time ago and the integrations might not have been fully modern. Or they might not have cared because the extra inventory and processes to save a few cents on the sender might have cost more anyway. But please tell me you are not still confusing the idea of a pressure gauge sender, and an oil pressure light switch. The switch will be out there. In a separate hole. Probably with only one wire running to it. Running the light.
    • Blower needs to go low on the exhaust side, displacing the AC and PS, which you have to decide whether you want to keep and how and where to relocate if you do. Electric option for PS is, at least, helpful. Sadly, there is no workable 12V electric AC of any value. Whilst the blower is the last compression step before the throttle, and so it might seem a good idea to have it near the inlet manifold (as mentioned above), you probably want it to go through an intercooler first, so, having it on the opposite side of the car facilitates that air flow path. The turbo discharges into the blower, so proximity of the turbo's compressor outlet to the blower's inlet is nice. But then you might want to intercool that too, before boosting it again....which would probably be a ball ache. Routing pipes out to the front and back could be a bit shit. If there was room for (at least) a small (but preferably larger) water to air core on that side, then that would probably be the best approach. I guess a reasonable alternative would be to locate the blower where the alternator is (more or less, associated with the inlet manifold, per Matt's thought), and somehow incorporate a water to air core into the manifold, sort of like they do for modern blown V8s. The big difference here though is that those V8s have only the one throttle (upstream the blower) and only the one compression step (the blower) and no need for too much in the way of bypass/blowoff valves. Whereas in a twin charged 6, you do need to think about one or two bypass valves associated with the 2 compressors and you would prefer to have the intercooling done before the air has to pass through the throttle. You'd like the throttle to work approx the same no matter what the compression is doing. But if it is located in hot air stream before a cooler, then sometimes the air will be real hot, sometimes it will be quite cool, and the throttle mapping/response will be quite different between those two cases. The throttle, if sized for hot air, would be too large for cold conditions. It's all a ball ache.
    • Package SC on exhaust side. Remote mount turbo. Still a fair bit of room when you get creative on the inlet side of the motor too. Especially if you can get really creative with the welding, and effectively build it into the bottom of the inlet manifold. Would definitely take some design work, and some trial and error, to make sure flow works well still! Might be easier to just start with the Nissan March though... All the work is already done for you...
×
×
  • Create New...