stock bore size?...rb26

[TennesseeR33GT-R]

the stock bore size for the rb26 is 86mm?...
what is the safest bore i can go on the stock motor?..

[mcfly]

stock is
86.0 x 73.7

most do not go more then 1-2mm

but hks makes a 89mm bore head gasket

[CanadianGTR]

Moved to GTR Tech.

[tyndago]

Re: stock bore size?...rb26

the stock bore size for the rb26 is 86mm?...
what is the safest bore i can go on the stock motor?..

Stock is 86mm.

The safest is 86mm.

[Marke]

^^^LOL.

"What is the largest an RB26 can be bored to and still be safe?"

[TennesseeR33GT-R]

so...if i had alittle scar in it i cant bore it to like a 87mm or a 88mm??...

[tyndago]

so...if i had alittle scar in it i cant bore it to like a 87mm or a 88mm??...

You asked whats safest. Safest are the thickest bores possible. Even though if you go 1mm over, thats 1mm all the way around the bore. You remove a lot of material.

If the car stays around stock HP you are ok. As you bore it more and more, the walls of the bores get thinner and thinner. Not saying they will crack, but I have seen a bore split right down the middle of it.

There are some other things, but its not a conspiracy theory that the RB and 2J, new Ecotec motors have a stock 86mm bore.

[GTR-Dad]

Re: stock bore size?...rb26

the stock bore size for the rb26 is 86mm?...
what is the safest bore i can go on the stock motor?..

Looks like 0.5 mm to 1.0 mm depending on how much boost you want to run.

These guys say don't go over .5 mm with 2.4 bar of boost.

http://www.nissanforums.com/skyline/4493-je-pistons-rb26dett.html

These guys sell 1 mm over pistons.

http://www.modyourcar.com.au/product...oducts_id=2663 (0.040" = 1 mm)

At least one guy on SkylinesAustralia figures you can support up to 500 - 550 hp with 1 mm overbore.

Second hand info, but I'll bet it's pretty good.

Dan