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What Is The Difference...?

POWR34

By POWR34,
in Engines & Forced Induction

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Simon-S14 Grand Master

Simon-S14

Posted
Posted

a lot of missinformation in that thread.

the compression ratio is the same between the neo and older rb25's.

turbo is different. head has solid lifters and different cams. intake manifold is a better design.

rods are suppose to be GTR rods.. but ive never yet had that confirmed. pistons are the same as is the block.

lachlanw Veteran

lachlanw

Posted
Posted

one has 206 kw . one has 184 . nuff said .

what exactly do you want to know ?

lots of random stuff

neo head has bigger exhaust valves than gtr, combustion chamber is a lot smaller , top feed injectors , new cas . no coil bracket . coils bolt straight to head . takes gay lil oil filter . has bigger exhaust housing on turbo .

bubba Grand Master

bubba

Posted
Posted
RB25DET NEO runs hot burn technology, basically the gases burn at a higher temp which causes less emissions-not sure how that works but it does-closer to EU standards

Which is why the Neos seem to have an 80-82deg thermostat as opposed to the earlier 76.5deg ones.

GTScotT Grand Master

GTScotT

Posted
Posted
one has 206 kw . one has 184 . nuff said .

You do realize that the above information is irrelevant dont you? That 22kw would be like pissing in the wind for the R33 motor to make with the most minor of changes to the ecu.

As per OP, major differences with the neo is the head and intake. The neo head has a smaller dome in the and will not work with such things as RB26 pistons etc. The intake manifold is said to be more efficient and uses top feed injectors which are cheaper to outsource.

End result of similarly modified motors is relatively similar :cool:

aleks Community Regular

aleks

Posted
Posted
a lot of missinformation in that thread.

the compression ratio is the same between the neo and older rb25's.

turbo is different. head has solid lifters and different cams. intake manifold is a better design.

rods are suppose to be GTR rods.. but ive never yet had that confirmed. pistons are the same as is the block.

Pistons are definately N1 so they are not the same. Oil pump is a N1 with a small crank collar.... can't remember rods.

wasnt me Collaborator

wasnt me

Posted
Posted

bit off topic. but i didnt realise the r33 and r34 gear boxes were a bit different. i got this from a nissan review of thr r34

quote.

Shot peening is applied to the first, second, third and fifth gears of the manual transmission for improved strength and durability to accommodate the higher engine torque. A double cone synchronizer is also provided in the first gear position, in addition to those previously used in the second and third gear positions, for smoother, easier shifting. Moreover, a pull-type clutch for easier operation has been adopted in the manual transmission on turbocharged models.

aleks Community Regular

aleks

Posted
Posted (edited)

I don't know the full history of my engine, it has about 120 000kms on it. It had a genuine head gasket, bearings and timming belt in it So it doesn't look like the engine has been pulled apart.

I realise the difference between the pistons, my pistons have the thinker top ringland. (should of said N1 type pistons)

Also is "n" with a single dot above it are the markings for N1?Because my oil pump also has this marking.

I could be wrong.... would be keen to hear from someone who has actually pulled a Neo apart.

I'll be able to throw up a few pictures on here in a week.....

Edited by aleks

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