Cams For Rb25de Neo Head

[Cartman]

Assuming these are similar to rb26 being solid lifter... however as it also has vct should i assume that it has different length springs on the inlet compared to the exhaust like the r33 rb25 heads?

anyone done cams before on a non turbo r34 neo head before?

[R31Nismoid]

Aren't the N/A NEO heads super nasty in terms of flow?

I remember seeing pics of a NEO-N/A & a NEO-T and if my memory is correct there was a fairly big difference which would make a non neo a bit nasty

[Cartman]

Aren't the N/A NEO heads super nasty in terms of flow?

I remember seeing pics of a NEO-N/A & a NEO-T and if my memory is correct there was a fairly big difference which would make a non neo a bit nasty

yeah.. but its on there already. might just leave it stock for now.. and change to one of my spare 26 heads later down the track

big difference intake side.. ALOT of meat could be taken out easily. but.. its all assembled and ready to be started.. but was looking at dropping some cams in just for time being.

[Cartman]

Aren't the N/A NEO heads super nasty in terms of flow?

I remember seeing pics of a NEO-N/A & a NEO-T and if my memory is correct there was a fairly big difference which would make a non neo a bit nasty

and wow.. just round the standard cam specs on the non turbo neo head in comparison to the others

R32 Skyline RB25DE Camshaft duration 240°in, 232°ex lift: 7.8mm in, 7.3mm ex

R33 Skyline RB25DE Camshaft duration 240°in, 240°ex lift: 7.8mm in, 7.8mm ex

R33 Skyline RB25DET Camshaft duration 240°in, 240°ex lift: 7.8mm in, 7.8mm ex

R34 Skyline RB25DE Neo Camshaft duration 236°in, 232°ex lift: 8.4mm in, 6.9mm ex

R34 Skyline RB25DET Neo Camshaft duration 236°in, 232°ex lift: 8.4mm in, 8.7mm ex

Stock neo turbo cams are ok, but f**king shit on the exhaust side of non turbo :S ! definately goin to run it how it is and throw an rb26 head on it later down the track

[Adriano]

I put an rb26 exhaust cam in the neo 25/30 i built, just shim it and your done

[Cartman]

I put an rb26 exhaust cam in the neo 25/30 i built, just shim it and your done

was that a turbo or non turbo neo head tho?? i'm not sure if the non turbo head's valve springs will handle the lift of a 26 cam

[Sarumatix]

Thread Necro but I am in exactly the same position now.

I only really need to change the exhaust camshaft (so no worries about CVT), is there any problem with dropping a 26 exhaust camshaft in? I presume I just need to make sure the CAS has the same spline (ie use the 26 CAS instead of 25).

I can't find any information about the springs or valves being different between rb25de and rb25det neos, although the intake runners are definitely narrower on the DE.

Edited February 11, 2013 by Sarumatix

[dori33]

thread revival, does any one have any info ^ mentioned above

Thread Necro but I am in exactly the same position now.
I only really need to change the exhaust camshaft (so no worries about CVT), is there any problem with dropping a 26 exhaust camshaft in? I presume I just need to make sure the CAS has the same spline (ie use the 26 CAS instead of 25).

I can't find any information about the springs or valves being different between rb25de and rb25det neos, although the intake runners are definitely narrower on the DE.

Edited July 6, 2013 by dori33