help engine convversion

[Ed]

I still have my doubts about 175 rwkw without a huffer.



courtesy of wikipedia....

RB30DET - R31 RB30E block, R32 RB25DE head.
Nissan did not produce this engine, but it refers to a turbocharged engine featuring an RB30E block with a twin-cam head conversion. Common hybrid in Australasia using a RB30E bottom end mated to a RB25DE or RB26DETT cylinder head and turbo (RB20DE and DET heads are generally not used as there's little or no flow improvement). The RB25DE cylinder head from the R32 Skyline, A31 Cefiro or C33 Laurel can be used, and fits almost directly on. The RB25DET (from the R33 Skyline or C34 Laurel or Stagea) head is also used, however an external oil feed must be fabricated for the variable cam timing on the RB25DET, and the galleries at the front of the engine do not line up. The variable cam timing may be disconnected altogether.
The fitment of a twin cam head from any of these engines onto a standard compression RB30E bottom end gives an ideal compression ratio for a mild to moderately modified street turbo engine, making the conversion popular amongst those who would otherwise convert their RB30E to a high compression RB30ET using original ET bolt on externals.
Although it has a larger displacement than the RB26DETT, maximum possible horsepower is less, as the RB30 block lacks the RB26 block's internal cast-in bracing, and consequently cannot rev as high due to harmonic issues at ~7500 rpm. To compensate, the RB30DET produces more torque at lower revs. There is also an 'RB30DETT' kit manufactured by OS Giken of Japan, which bolts an extension on top of the RB26 engine block, and fits liners, to give an 86 mm bore x 86 mm stroke. It is available as an assembled short block, containing billet chrome-molybdenum crank, billet chrome-molybdenum H-beam connecting rods, forged pistons, and costs ¥1,500,000.[8]


courtesy of wikipedia.

RB30DET



RB30DET - R31 RB30E block, R32 RB25DE head.
Nissan did not produce this engine, but it refers to a turbocharged engine featuring an RB30E block with a twin-cam head conversion. Common hybrid in Australasia using a RB30E bottom end mated to a RB25DE or RB26DETT cylinder head and turbo (RB20DE and DET heads are generally not used as there's little or no flow improvement). The RB25DE cylinder head from the R32 Skyline, A31 Cefiro or C33 Laurel can be used, and fits almost directly on. The RB25DET (from the R33 Skyline or C34 Laurel or Stagea) head is also used, however an external oil feed must be fabricated for the variable cam timing on the RB25DET, and the galleries at the front of the engine do not line up. The variable cam timing may be disconnected altogether.
The fitment of a twin cam head from any of these engines onto a standard compression RB30E bottom end gives an ideal compression ratio for a mild to moderately modified street turbo engine, making the conversion popular amongst those who would otherwise convert their RB30E to a high compression RB30ET using original ET bolt on externals.
Although it has a larger displacement than the RB26DETT, maximum possible horsepower is less, as the RB30 block lacks the RB26 block's internal cast-in bracing, and consequently cannot rev as high due to harmonic issues at ~7500 rpm. To compensate, the RB30DET produces more torque at lower revs. There is also an 'RB30DETT' kit manufactured by OS Giken of Japan, which bolts an extension on top of the RB26 engine block, and fits liners, to give an 86 mm bore x 86 mm stroke. It is available as an assembled short block, containing billet chrome-molybdenum crank, billet chrome-molybdenum H-beam connecting rods, forged pistons, and costs ¥1,500,000.[8]

[Spinner]

Australian Muscle Car Magazine, Issue No 1 features an FC with an RB30.

Spinner

[Johns]

Ed,

too much information


too much information

Cheers
John ;D

[Ed]

you not seen Goodfellas?

Johnny "two times" says everything two times.

"gonna get the paper... get the paper"

Cheers

Ed

 ;D

[JB]

Sounds like the Aviator...

[Ed]

Sounds like the Aviator...

hey you're an Aviator  :P

cool avatar Jas.

Cheers

Ed

[ekspecial]

he said it would run forged pistons h rods tommi cams thanks again rod

Lol, how much money do you have to spend that is sounding VERY expensive.

IMHO anyone talking about running any kind of RB20/25/30 motor N/A is nuts. The beauty of the RB motors has always been the copious amount of power you can get out of them reliably with boost.

How much $$$ do you have to spend on this conversion?

I think the RB swap and the V8 can cost about the same, it all depends on how you source your parts, how knowledgeable you are, and how much work you can do yourself. A conversion that costs under $10K for someone can cost $20K+ for someone else.

But as a general rule of thumb that has been told to me, and I have found true almost every time, whatever you think a project is going to cost double it and you will have a reasonable estimate.  :) No kidding!

But may I ask what you want from this conversion?, do you just want a reliable and fun driver, if this is the case I would just go V6, plenty of torque from 3.8l, the conversion has been done plenty of times and parts are so easy to get. A V6 can easily make more power than a tired old badly tuned 253/308.