Rb31det

[RB30Z32]

Hello all.

I've have a question about RB31DET's.

What makes them 31's, different from the 30's?

I have a series 2 N/A RB30 that I'm bolting a RB26 head to & putting it in my Z32. I'm going to be using forged pistons antway & was wondering if the RB31 is just a overbored RB30. I've been searching around on here & the interweb but can't find the info on what makes a RB31 a RB31.

Any replys would be graetfully received.

Thanks

Stu.

[R31Nismoid]

Boring the cylinder and using oversize pistons.

[RB30Z32]

What is the bore diameter?

[N1GTR]

In a standard block it is 86mm (width of the chamber where the piston slides up and down)

[R34GTFOUR]

drop 87mm pistons in there and you have a rb31:D

Edited December 27, 2008 by R34GTFOUR

[RB30Z32]

Thanks for the info guys.

[R.I.P.S NZ]

Thanks for the info guys.

87mm bore with stock stroke is only 3032cc, your far better to keep the bore as thick as possible and if you want a RB31 or bigger go with a stroker crank with custom pistons and rods etc.

Not worth the trouble/expense unless your after something different and even more torque than a 30.

A well built 30 is usually plenty in any case.

Rob

[Spoolup]

Hi Rob

Since no one has asked the question I will.

What does one of your RB33 stroker kits cost ? and what does it consist of ?

I am just curious as are a few on these forums.

Cheers

87mm bore with stock stroke is only 3032cc, your far better to keep the bore as thick as possible and if you want a RB31 or bigger go with a stroker crank with custom pistons and rods etc.

Not worth the trouble/expense unless your after something different and even more torque than a 30.

A well built 30 is usually plenty in any case.

Rob

Edited December 30, 2008 by Spoolup