GTS4 RB20 sump onto RB30 block??

[JH32]

Could the sump from the GTS4 bolt onto the RB30 block?

To make a 3L GTS4 and keep the 4WD??

Cheers

[Guest mort]

If the sump is similar to that of an RB26DETT no it won't just bolt straight on as the RB26DETT sump is a bit wider on the drivers side and has a number of 8mm bolts on this side to compensate for the weight of the front diff, it can be made to fit the RB30 block but there is a bit of work in doing this.

cheers

[Belly_up]

if you look at the bottom of an rb20 block in a GTS4, it has 2 complete sets of bolt holes for the 2 different sumps. The 4wd sump bolts up to the outer set of holes using 8mm bolts, whereas the 2wd sump bolts up to the inner set of bolts using 6mm bolts. There are also different oil pickups between the 2wd and 4wd models, although this would be easier to fix if you're going from 2wd (rb30) to 4wd, than it was for me to go the other way (i'm using a GTS4 rb20 in a rwd configuration, and it was a complete pain in the arse, despite the assurances of the import wrecker)

[Scribble]

Quite possibly a stupid question: But can you just drill and tap a 4WD pattern into the block?

[Duncan]

don't know?

but I do know GTS4/GTR sumps are bolt up swaps.

[Cubes]

Keep the thread going ppls.

Interesting read Belly_up!

So what your saying is you could make an adaptor plate that is similiar to that of say a turbo flange adaptor plate.

You would then have to look at extending the oil pick up slightly to accomodate for the height of the adaptor plate.

It would also make lowering the engine slightly difficult??? Due to the 4wd gear.

This would require one to use a RB26 head or a custom plenum on the rb25 head as to prevent bonnet fouling issues.

I would seriously look at a rb26 head.

Has the injectors to make some decent power, slightly better cams, solid followers(higher .050" lift), and it will work perfectly with the RB20DET's wiring loom and ecu(powerfc) providing you wire in the injector resistor pack from a GTR/300ZX.

Any one have pics of the RB20DET GTS4 or GTR sump and block bolt up pattern?

[Scribble]

Cubes: That was my next question. We definatly need some photos of the patterns here. Has anyone seen the RIPS adapter plate? And did he use a custom plenum on the 25 head does anyone know?

Really i would love to start work on an RB30DET but have to clear up the issues with the sump mounting and possible clearance issues the adapter plate could cause with the sump fouling on something.

It's for an R32 GTS4 btw.

[Cubes]

Yes, the RIPS GTS4 I know of had a custom plenum.

It may work out cheaper to go for the RB26 head than to bugger around with custom plenums etc.

[Scribble]

I have heard of an adapter plate to bolt up the rb26 plenum to the 25 head. SO might not be that bad.