Crank Strength And Upgrading Options.

[N1GTR]

Fair enough, bit of a shame as id prefer mahles. Oh well

Ill keep the rb30 block here and keep waiting

[Cubes]

3.4ltr T04Z or GT40 with 3ltr GT30 type response/spool. Yes thanks.

[Spoolup]

I cant wait either - as I get to trial it :-) Ill keep my T04Z setup on the trial engine.

Crank will come std with long oil pump drive.

I can special order some titanium rods for it - but they are like 3k a set.

[N1GTR]

Pffft, nah guys dont waste your time. Bring on the T51R for this motor, or a T88. I could probably get a T88 to use.

What sort of rev limit is expected for this setup? Also the head used would play a part in the results of the bottom end, will the head be a stock head? If not, what specs for the head

Edit: The more i think about it, the more it appeals to me having the T51R hanging off the side. GTR is definatly the platform to try that sort of thing on. Cant wait. Now have 2 spare rb30 blocks as of today

[R32 Driver]

also interested in what sort of rev limit this would have

I think if it revs hard enough t51r might even be undersized (kai)

RB33DET AWD has a lovely ring to it

[Cubes]

http://www.youtube.com/watch?v=Rv67yLI_jVs

T51r RB30 GTR. Doesn't seem to lag or go all doughy too badly even on the 3ltr.

Just a pitty they limited rev's to 7k in that vid.

[r33_racer]

im also interested in the rev limit....any rough ideas brad?

[Spoolup]

It will be less than the std RB30 crank, as it will now be an under square bore / stroke ratio.

[N1GTR]

I rev mine to 7000rpm, so id guess 6000rpm?

[r33_racer]

I guess it would be more a when you stop making power...or piston speeds....or when it blows up, build another and dont rev it so far

[Adriano]

People are revving stroked 3.4L 2jz's to 8000 rpm. I suspect it will rev as hard as the turbo, head, cams will allow, or the block will snap in half along the welsh plug holes!

[N1GTR]

Thats a good point

Also you've raised the block strength. What can be done to help the blocks survive?

[shanef]

Thats a good point

Also you've raised the block strength. What can be done to help the blocks survive?

grout fill the bitch!

[N1GTR]

For a street car thrashed at the track, half fill or quarter? Dont know much about block prep and grout filling

[shanef]

It will be less than the std RB30 crank, as it will now be an under square bore / stroke ratio.

why so? same bore/stroke as the 2j (even compared to the 3.4l 2j stroker at 94/87)

[Spoolup]

Because under square engines dont like to rev as hard due to piston speed, ie longer stroke but its relative to set up where power is made etc.

My rb30 stops making power at 7500 and is limited to 8000 rpm.

I have a customer making 706 rwhp in BA XR6 - that big 4 litre only turns to 6000 rpm and makes peak power at 5400 rpm :-)

Edited November 13, 2008 by Spoolup

[2rismo]

For a street car thrashed at the track, half fill or quarter? Dont know much about block prep and grout filling

All bar an inch, inch and a half from the top. That's where all the heat is made anyway.

[Rolls]

Remember people you won't need to spin it as hard as an rb30 to make big power though, so even if its 1-2k lower it will still crush the rb30.

[R TUNE]

i wonder how long we have to wait.

well at least i havn't started on the race car eng yet. RB34DE .

camshaft profile will be intresting to considering the diffrent displacement.

[N1GTR]

All bar an inch, inch and a half from the top. That's where all the heat is made anyway.

Ok cool! Cheers