R33Det & R34 Gtt Crankshaft And Engine Block

[zoom]

can someone please comfirm taht r33det & r34 gtt crankshaft and engine block are interchagneable?

Thanks in advance.

[HR32GTS 4DOOR]

Not sure about the crank but I would assume they are. The block may be different depending if it is a series 2 or 1 r33 block since the 33 S1 didn't have vct the oil galley will be different to the 34 head

[Simon-S14]

Cranks are the same as is block

[Simon-S14]

Not sure about the crank but I would assume they are. The block may be different depending if it is a series 2 or 1 r33 block since the 33 S1 didn't have vct the oil galley will be different to the 34 head

All Rb25's have vct

[dori34]

used a r33 block with my r34 rebuild, as confirmed by Simon, its the same.

[HR32GTS 4DOOR]

All Rb25's have vct

sorry was thinking of r32 rb25 head which didn't have vct

[zoom]

piston number 1 was fitted to the r34 crank and block, the piston (for r33 with Cp piston 9:1CP and Manley rod) is sitting about 1mm above the deck. is it because the CP piston with 9:1CP?

[JonnoHR31]

Edit: nevermind, misread your post

Edited March 27, 2012 by JonnoHR31

[discopotato03]

The way to find out would be to compare a standard piston with your CP ones . I think the chamber sizes are different R33 R34 DET heads so you would need to buy R34GTt specific pistons to get the static CR right .

Should always measure anyway , cheers A .

[dori34]

thats correct, with the CC being different between r33 and r34 heads.

however i used off the shelf CP RB25 pistons for my R34 rebuild and ABO BOB did the same, no issuess.

[GTSBoy]

zoom,

What rods were used? The Neo rods are the same as RB26, and hence different to the R33 RB25 rods. That's why you need different pistons.

[zebra]

Rb25 and rb26 rods are the same length though

[kitto]

All Rb25s including NEO and RB26 rods are interchangeable. The NEO and RB26 share a meatier rod though.

[GTSBoy]

Yeah.....ah.....ignore me.

[zoom]

all parts are for r33det, only the block and crankshaft is from r34. The CP piston used is SC7305 (which has 9:1CR 86.5mm). The compression height for for the 9:1CR and 8.5:1CR is the same.

"CP Pistons said that the valve reliefs are the same for both the 8.5 and 9.0 pistons. They say they design the pistons to accept high lift and +1.0mm oversized valves."

If the above is true, than r34 block or crankshaft is different to r33. Has anyone done this before (ie using r34 block/crankshaft and everything else are to suit r33)?

Will measure the stock piston.

I know for sure that r34 and r33 pistons are different (different in compression height.

[JonnoHR31]

yer but thats to allow for the smaller combustion chambers. the blocks, cranks and rods (apart from thickness) should all be the same.

[scotty nm35]

Has the block been decked?

[JustinP]

Can you take a picture of how far it protrudes above the deck and post it on here?

all parts are for r33det, only the block and crankshaft is from r34. The CP piston used is SC7305 (which has 9:1CR 86.5mm). The compression height for for the 9:1CR and 8.5:1CR is the same.

"CP Pistons said that the valve reliefs are the same for both the 8.5 and 9.0 pistons. They say they design the pistons to accept high lift and +1.0mm oversized valves."

If the above is true, than r34 block or crankshaft is different to r33. Has anyone done this before (ie using r34 block/crankshaft and everything else are to suit r33)?

Will measure the stock piston.

I know for sure that r34 and r33 pistons are different (different in compression height.

[Simon-S14]

rods same, pin height varys depending on the engine.. eg 25 or 26

[dori34]

i used a R34 crank in R33 block in my build

i compared the cranks side by side and they are exactly the same!