Rb25de Build.............

[CS_180]

Have been told that the crank out of the Rb30 when put in a 25 makes it out to a 2.8 L!!!

Is this correct???? and if so what else is required to make it work?

[GTS4WD]

The bore is the same for the Rb25, 26 and 30. The diff is the stroke between the three.

It is posible. The rb30 Crank is nitred. I remeber reading something about the rb25 geodgen pins sitting higher (hence lower CR) than on the rb30 pistons. You could use all the rb30 internals in the block. Not sure about this. But definately worth looking into.

There are stroker kits available.. but for stupid amounts of money! And for turbo applications..

Pretty much the easiest, cheapest and best is to just do an RB30DE conversion. Its not a bad NA conversion for all of ~$500 or ~$1200 if you want a good basis for a solid NA car..

http://www.skylinesaustralia.com/forums/t186051.html

Thats my plans.. Run down on pg 2

Can someone shed some light on if it is possible to put RB30 Internals into an RB25 block?.. Saves A SHITLOAD of work for me.. Its an interesting option. Saves me the legalities of swapping from a 2.5 to 3L, front diff adaptor, VCT piping, timing belt, relocation of pullies..

lol.. sorry for hijacking your thread.. but its an interesting prospect!

Edited October 29, 2007 by GTS4WD

[CS_180]

np u can hijack.........person i was speaking to wasnt sure if the 30 rods or 26 had to be used,

i have to get in contact with hioctaneracing andget actual details. As u said it saves the hassle of blue slips and stuff that would be required with the engine swap, was considering supercharging it so it would be an Rb28des..............food for thought!!!

[GTS4WD]

If you want to increase Capacity, as before, RB30DE is the easiest.

You can use the whole rb30 bottom end, crank, rods etc. etc.

There is a .pdf file floating around, I can send you it if needed. Its a clear and simple build of an RB30DET. Which can easily be used to make an RB30DE

Just a thought, If you use an RB30 crank, rb25 rods and pistons, and you get a 2.8L.. the other 200cc's must be atributed to the rb25 geodgen pin sits higher towards the top of the piston compaired to the rb30 which sits further away from the face of the piston?

I dunno.. just an idea.

[CS_180]

Spoke to hi octane today, as suggestedthe rb30 crank into a rb25 will not work.....pistons end up about an inch to high............so it looks like i will be doing a 30/25 conversion.

thannks for your imput!!!!