Which Pistons Rb26

[sinistaGTR]

I know this could be a how long is a piece of string question.

But I am doing a basic build on my GTR. not looking for huge power

Will be 86.5mm pistons.

1.3mm head gasket,

-5 turbos,

tomei type poncams

Should I be getting 8:5:1 or 9.0:1 CP pistons

[XRATED]

which pistons??? round ones! ha ha.

Basically, I chose to go with slightly higher static cr because I planned on running e85.

If your planning to run pump fuel, then go 8.5:1

[Blackkers]

Go for the higher comp unless you plan to run stupid boost on 98 imo

it will improve off boost drive ability, but by how much? who knows

e85 + stupid boost still go the higher comp.

[Ben C34]

I would go at least 9:1

[sinistaGTR]

What would you call stupid boost? Im looking at possibly 20psi-24psi

[Ben C34]

No worries

[sinistaGTR]

Cool thanks guys

[XKLABA]

The other thing to look at is -5s on a 2.6 will come on later in the rev range so the motor will disapate the boost better meaning you can get away with a higher CR, also what cams are you planning on cause same goes there, the bigger duration the higher CR you can use

Round ones LOL!!!

These ones

[zebra]

Oval Piston Honda 500?

[XKLABA]

Yeah, Honda NR500

[zebra]

Nice,

Love that 8 valve head.

Sucks they outlawed them so quick.

[XKLABA]

Yeah shame, surprised some one has picked em up and run with em

A V4 with these things would be awesome

[sinistaGTR]

I have tomei type Bs already

[choyda]

Hi Dan. I was advised to go drop-in 9.something lift 272's with adjustable gears when I had them - stock pistons though. From memory, the cams made ~300rpm difference.

I only ever ran 18psi.

[XRATED]

The other thing to look at is -5s on a 2.6 will come on later in the rev range so the motor will disapate the boost better meaning you can get away with a higher CR, also what cams are you planning on cause same goes there, the bigger duration the higher CR you can use

Round ones LOL!!!

These ones

image.jpg

Square piston engine?

http://thekneeslider.com/the-hossack-engine-a-square-piston-two-stroke/

ba ha ha ha h///

[choyda]

If you consider the Mine's car, that ran 2.6L with 2530's (slightly more responsive to the -5's). Maybe look at what compression/specs it had. I know the videos were based on the fancy diff but still a hell of an engine.

[XRATED]

... that was ALOT of fine development, the kind of r$d that costs a lot for minimal results, but in that case the multiple of minimal results, resulted in a very cohesive package.

... static CR would only have been one small part of it.

- for my thought's on 98, I'd prefer the 'buffer' of 8.XXX:1 rather than 9.XXX:1 with -5's. Just for that bad batch of fuel, hot day etc variables. the few hundred rpm difference in boost threshold is worth the extra safety margin for me in a street-able car on 98 with low mounts.

- at the end of the day it's probably much the muchness depending on who and how hard it's tuned.

J.