Rb30 Questions

[GtrVspec]

Hey cant seem to find what i was after.....just bit confused...

1.The rb30 out of a turbo vl or non turbo is still used for the rb26/30 conversion?Is there any diff in the rb30 from the turbo to the non turbo or just the internals?

2.Ive sourcred a r31 skyline motor which is a rb30,is this suitable for the rb26/30 and or the same as the vl bottom end rb30?

3.Is there a certain year model rb30 which has particualr extras on the block which is a benifit for the conversion or theyre pretty much the same all through?

4.Whats a diff between rb30e???to a rb30?

Cheers...

[RB32DETT VL]

As far as I know...

1. You can use either the VL turbo or NA block. Only real difference being lower compression on the turbo one.

2. Should suit the conversion. Think they're the same.

3. From the RB25/30 pdf "Be sure to select a short motor that has provision for the turbos oil feed/return, water return and has both lower tensioner locations machined flat, some do not have the machined area to mount the tensioner."

and

"Should the block lack water/oil provision it is possible to drill and tap."

Which basically means, get a series 2 block, or get a series 1 block and drill and tap water and oil provisions.

4. Nothing.

Cheers

[GtrVspec]

cheers thanks for that

[the big JC]

there is no such thing as a RB30 only RB30E the E stands for efi and they only come out in efi as for the bottom end the only diiference between the turbo and NA bottom end is that the turbo ones have slightly stronger conrods and different pistons and you deffinently want a series 2 block i have a mint one you can have for $80

[GtrVspec]

so the compression is the same being a NA rb30e or Turbo rb30et? if not what the benifit of a high compression n low compression.

[stagefumer11]

Wrong... In some ways. Some early nissan patrols came out with a rb30 Carby

[R30-RB30DET]

RB30ET's are a stupid compresson ratio like 7.5 to 1 but im unsure what they end up when you chuck a RB25 head on them but I would say it will go down even further, but the normal RB30E's are like 9.5 to 1 then end up being around 8.5 to 1 with the RB25 head which is good really for turboing!

Ohh and "the big JC" $80 for a Rb30 block?!? I would have swaped you most of that L20ET stuff you wanted for it if you were in NZ lol damn it!

[the big JC]

Wrong... In some ways. Some early nissan patrols came out with a rb30 Carby

some one told me that but i thourght it was bulls#!t i only thourght they came out in an efi

[NismoR31Jet]

The turbo RB30 actually has a few differences.

Besides lower compression the turbo engine also has a high volume oil pump and oil squirters in the block that squirt oil on the underside of the pistons to help cool the pistons. I think that is all for bottom end differences.

The camshaft is different too but that is of no concern if you are going twin cam head.

[discopotato03]

RB30 short FACTS .

All Aust R31's have S2 blocks meaning they have provision for turbo oil supply and drain plus coolant water feed . No production RB30 block had piston oil squirters and it is a difficult mod to do because the RB30 main oil gallery walls are thinner in the block than rb20/25/26 so very few will work .

Fitting the RB25 head to an NA RB30 gets you around 8.3:1 static CR , on an RB30ET gets very low read stupid low CR .

The RB30S was a poverty pack option on ST model GQ Patrols , it was carburetted .

RB30ET used a slightly higher volume oil pump because its bush bearing dinosaur T3 turbo needs a fair bit of oil to keep it lubed and cool .

The RB30 ET was in a very low state of tune for a turbo engine . CR under 8.0 , boost only about 4lbs positive , no intercooler and turbo small for 3 litres . Feels torquey in a lightweight VL commode door , the General was concerned at the time that the Jap heart may have slapped the iron 8 which they can do with suitable mods . They were reasonably cheap to mass produce though the dollar/yen exchange rate eventually went against the RB and we wound up with the cheaper Buick based 3.8 V6 .

Cheers A .

Note : This conversion (DOHC) is not a cheap operation to do properly , far from impossible but not cheap .

[SteveL]

RB30ET uses upgraded rod bolts compared with RB30E.

Trivia: all RB30 heads are the same casting.....which, at that time, were manufactured at Nissan's casting plant just outside of Dandenong in Victoria. Raw castings were shipped to Japan for final machining and assembly.