Will Gtr Valve Buckets Fit Rb25 Neo

[BlackBox]

Hi,

EDIT:

Found my answer that they wont fit,

so what is the easiest way to get away from shim ontop of the bucket?

i will be running tomei Poncams, supertech duel valve springs and standard Valves.

Edited June 12, 2014 by BlackBox

[Joshbigt62r]

Leave the neo head as is. No need to muck with it.

[BlackBox]

I have heard the shim ontop of bucket is susceptible to spitting shins out above 7.5k Tom especially when using a more aggressive camshaft

[GTSBoy]

Here's a guy who did some of your research for you last year.

http://www.skylinesaustralia.com/forums/topic/430208-anybody-have-serious-experience-with-neo-valvetrains/

[BlackBox]

unfortunately there is no replies in that thread so it just adds to my confusion.

I have spent hours trying to find information but still dont know what to do.

is the rb Neo spitting shims even a real problem? i have only 'heard of people hearing about it'.. no first hand experiences .

[Ben C34]

I would imagine the correct valve springs would make shim spitting far less likely.

I haven't come across any threads from guys who have spat shims.

[GTSBoy]

It's just a risk in general with shim over engines. Some engines have a serious reputation for it. But I must also admit to never hearing anyone complain that their Neo has actually done it.

And that thread I linked gives actual solid info on what buckets and shims could be used, so it's not useless.

[r33_racer]

If you are worried that much, loctite the shim to the bucket.

Edited June 14, 2014 by r33_racer

[MJTru]

Lol. I was thinking. Can he just use the neo head on a r33 rb25 skyline. Ive always wanted to do that cause it would be way easier than to convert a r33 rb25 head to solid lifters. IIRC. Only the intake would be different. And I think it as dual VTC. One of them would have to go.

Edited June 14, 2014 by MJTru

[Ben C34]

Lol. I was thinking. Can he just use the neo head on a r33 rb25 skyline. Ive always wanted to do that cause it would be way easier than to convert a r33 rb25 head to solid lifters. IIRC. Only the intake would be different. And I think it as dual VTC. One of them would have to go.

It's not dual vct. Still only on intake

There some slight wiring differences but no worries.

Will result in a big compression increase due to the smaller chamber of the neo head.

Would be really good on e85 and totally shit on petrol!

[MJTru]

Interesting. Ive always wanted to do a build like that. I would use lower compression pistons if the head is that much smaller in the chamber.

[GTSBoy]

These last few posts are not to the point of the thread - I think the OP already has the Neo and would like to make it more like RB26 or like a solid lifter converted 25. Putting a Neo head onto another RB25, whilst a good idea and subject to the questions and points in those last posts, does not address the potential problem of shim spitting.

[BlackBox]

I did consider using some retaining compound on the shims to hold them in place,

[r33_racer]

Aside from maybe getting some aftermarket shims that might be a tighter fit in the seat, chemically retaining them is probably the best/easiest fix you can try.