Neo Head Or Not?

[StevenCJR31]

will the neo manifold fit the 33 head? i have my doubts

can someone confirm/deny?

[Ben C34]

will the neo manifold fit the 33 head? i have my doubts

can someone confirm/deny?

from what I have found the gasket is the same part number, which would suggest it will fit.

[Ben C34]

Since were Ozzy's, please use km/h

Drag racing uses mph, and as far as that goes i'm not ready to change. Psi in tyres, and mph for drag racing.

[discoPumpkin]

Psi in tyres? go home Ben your drunk

[HR32GTS 4DOOR]

Psi in tyres? go home Ben your drunk

I thought school holidays weren't for a few weeks.

[discoPumpkin]

dunno but you've got the big ass 4 door, so plenty of room in that boat to drive around the kids in the holidays

Edited June 15, 2013 by discoPumpkin

[jet_r31]

not banned yet huh

[HR32GTS 4DOOR]

dunno but you've got the big ass 4 door, so plenty of room in that boat to drive around the kids in the holidays

Nah during school time is better cause they all congregate in one place. nd 14 yeah old grlz luv the sutututu

Sorry OP you can have your thread back now.

[WMDC35]

will the neo manifold fit the 33 head? i have my doubts

can someone confirm/deny?

intake does bolt on

[StevenCJR31]

^^ okay cool, thought the r33 25de head the OP wants to use might be different to the neo intake stud pattern

i know the 32 25de is different to 33 de

and 33 det

[MRHD66]

http://www.lewisengines.com.au/category15_1.htm rb25neo head will flow more the a RB26 or RB25 and neo is $5000 cheaper

Edited June 16, 2013 by MRHD66

[Super Drager]

Since were Ozzy's, please use km/h

He's talking about trap speed for drag racing. MPH is the norm, not KMH.

[steve200b]

Neo head VCT helps with limiting the oil in the head at revs, solid lifters+vct= better option in the long run just need different pistons.

[Ben C34]

Yep, I'm convinced. Obviously its a combination of a few things that make the neo head far superior, so going away from that head would be retarded!

Looking at piston choices, and comparing chamber volume of a RB30e/t to NEO it seems if I gett the RB30ET pistons with a 4.5cc dish i will end up slighlty higer than the claimed 8.5:1 , which would be spot on.

http://www.aclperformance.com.au/NissanRB30ETForgedPistons.htm

and from webbers guide

As listed in a previous section The head combustion CC's are as follow:

RB30E/T 55CC

R32 RB25DE 62CC

R33 RB25DE/T 63-64CC

R34 RB25DE/T 50-53CC
R32/R33/R34 Rb26DETT 64CC

Deck height to be machined to set compression ratio.

So my question is, have people used them? I have searched like mad and havent found concrete evidence of success, just some people that were planning on using them.

My concern is piston to valve clearance.

Any thoughts are appreciated.

[Ben C34]

** Just found out acl dont make pistons anymore?? **

[Ben C34]

Mahle Pistons Nissan RB30DET(Skyline) 86.5mm Bore NIS264405I05

available on ebay for around 800 delivered, will check local prices.
These seem to be the go. Its so good when a piston manufacturer gives the head cc's when stating comp ratio!

**edit, bit concerned by tiny skirt for daily use, don't really want loud pistons.

Edited June 18, 2013 by superben

[WMDC35]

is the neo a det?

[Ben C34]

yep.

[WMDC35]

If someone can show me a NEO head out perform a non NEO head for power and response on the same motor ill eat my shirt.

The only advantage I see with a NEO head is the ability to use bigger cams while retaining VCT, all other differences would be hard pressed to see a change on a dyno.

Use what you have and save your $$$.

have to agree, while the neo head is better, far superior is a bit steep, both motors in good condition with same mods produce a very similar result

any proof otherwise?

did hear of a neo flicking a shim out recently but didn't hear back why

[jet_r31]

** Just found out acl dont make pistons anymore?? **

ACL never made them thats why..they are mahle pistons....repackaged..lol

and yes they are a good piston

cheers

darren