Neo Internals In 33 Block

[Blackkers]

that depends. How much power and what boost level are you running? The factory spec motor is VERY strong. There's a guy on here making 680 HP at the wheels on a factory RB25neo bottom end.

Personally I wouldn't drop the cash on a rebuild until it's necessary

[75coupe]

^^^^ this plus, why do you want that power, seriously from a person that keeps modifying, get it solid and drive it...

So man times i have been to track days or a texi and i guy that does better times is std r33 with more seat time...

[sleptema]

Cheers for all the info guys. Will take all of that into consideration.

[dangerous dave]

If it aint broken dont fix it

[discopotato03]

Yes the economics is fix when it needs to be fixed . The only reason to build a Neo in an R33 block is to keep the original number , if that wasn't an issue I'd look for a Neo engine in good condition and run that - after the 33 engine expired .

Economics should take precedence over ideal unless people like being poor or have too much money to spend .

A .

[GTSBoy]

Missing the point much?

OP has a Neo with damaged crank. Also has a free R33 bottom end. Wants to Frankenstein them together. Has nothing to with ideals. Only to do with making do with what he has lying around.

[zebra]

Has anyone else stopped to think about the piston to bore clearance?

They are matched from the factory yes?

[GTSBoy]

I think we're either assuming that he would check the clearances and decide on whether he could/would use them together or ignoring the question based on the apparent budgetness of the situation.

[Piggaz]

Engine number?

It's a $28 blue slip or whatever they cost now. I had to do it when I changed over to my RRR block, that was 5 years ago.

Done and dusted.

[dangerous dave]

This is why im asking if this combo will work for clearance etc..

From someone on this forum with actually experience not theories..

[zebra]

Really?

You're asking people over the internet whether the piston to bore clearance is ok

without telling us the measurements

[dangerous dave]

Correct.. im asking on a site specialising in skylines if somebody knows if the dimensions of r33 and r34 bare blocks are the same..

[GTSBoy]

I think you're missing the point too. No 2 R33 blocks would be expected to have the same sized bores and the same sized pistons, such that you can wantonly swap pistons from one to the other without checking to see if they match. Ever heard of manufacturing tolerances? How about piston grades? F'rigzample.....Nissan would receive thousands of pistons a week into the RB engine assembly plant. These would have all been made to the same spec at the same factory, yet nevertheless, they would have come in a variety of sizes. So they would have been sorted into various size bins, and the smallest ones would have been put into the smallest bores and the largest ones would have been put into the largest bores. There might have been only two bins, there might have been 6, it all depends on how good the manufacturing was and how anally retentive the famously anally retentive Japanese automotive engineers at Nissan were feeling.