Difference by looking neo to non neo rb25

[Adz2332]

How can you tell the difference by looking at the engine between a neo and non neo 25?

 

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[GTSBoy]

Well, in the specific case of that car, because it is a DET Neo, the bloody great traction control motor & throttle on the crossover pipe is the main giveaway.

In general;

The plenums are different shapes. Neo is more "square". Little detail differences like location of coolant bleeders, type of IACV, etc.

There's an ECU boost sensor on the top/rear of the motor on Neos.

Injectors are top feed.

Turbos have OP6 housings, but of course this is easily changed.

The ECU is a bloody big giveaway if it is still in the car too. Part numbers don't really lie.

Edited July 31, 2019 by GTSBoy

[Kinkstaah]

In this scenario it's clearly a Neo. I would love to see how this is done in a scenario where all you get is the block and head bolted together with no peripherals at all which is obviously a bit of a bigger concern when buying a 2nd hand motor...

[GTSBoy]

Neos are solid lifter. Injectors are top feed. IACV is different, etc.

[Adz2332]

excellent cheers guys!

[Dil-Dog]

i can help you identify by seeing a picture  but a very easy way is that the neo's timing belt cover is plastic. people often say if the CAS is plastic its a neo BUT its not true because very late model series 2  and the ultra rare series 3's  cam with plastic CAS hitachi ones too 

[GTSBoy]

It's worse than that. There's a whole niche of late Stageas with engines that are about half-half vanilla and neo and I don't know what's inside them (ie, do they have the RB26 rods and N1 oil pump? Do they have the solid lifter head?).

[Kinkstaah]

23 hours ago, GTSBoy said:

Neos are solid lifter. Injectors are top feed. IACV is different, etc.

I get this, but what if you only have the motor? I.e there is no IACV, no manifolds, no coilpacks, no coilpack cover, and you can't pull a rocker cover off to confirm (i.e buying online or something).

I do not have a RB anymore but I always was curious about this, if the timing cover is plastic on a Neo, is it metal on a RB25 from a R33 then?

[Ben C34]

17 minutes ago, Kinkstaah said:

I get this, but what if you only have the motor? I.e there is no IACV, no manifolds, no coilpacks, no coilpack cover, and you can't pull a rocker cover off to confirm (i.e buying online or something).

I do not have a RB anymore but I always was curious about this, if the timing cover is plastic on a Neo, is it metal on a RB25 from a R33 then?

Neo doesn't have the front head oil return from vct and vct solenoid is different.

[GTSBoy]

33 minutes ago, Kinkstaah said:

I get this, but what if you only have the motor?

 

23 hours ago, GTSBoy said:

Neos are solid lifter

Worst case you take off cam covers. Plus what Ben said.