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Home > Help Needed / General Tech Chat > 12G295 head for 998

snowfruit

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321 Posts
Member #: 557
Senior Member

Ireland

26th May, 2005 at 12:39:42pm

Do you need the valves and springs when buying this head? or will the ones out of the original engine do?

http://mini.twisted-design.net/blog/

BENROSS

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Resident Cylinder Head Modifier

Mitsi Evo 7, 911, Cossie. & all the chavs ...... won no problem

26th May, 2005 at 04:57:29pm

better with the valves and springs as the inlets i think! are slightley larger than a standard 998 head

also this head 12g295 sports double valve springs and you need the btm and top retainers and the collets.

you could get a bear head and go for it with race valves etc etc but it will cost you more its which way do you want to go ??

your old springs would do at a pinch but you would at least require new inlet valves






wil_h

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9258 Posts
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Post Whore

Betwix Harrogate and York

26th May, 2005 at 10:01:34pm

The exhausts on the 12G295 are the same size as the standard 998 heads, but the inlets are much bigger.

If you're using this for a turbo, then you'll want better exhaust valves in any case.

As for the inlets, you could always buy a new set with the right type stem for a set of collets that you have.

So basically, the valves aren't that important when buying as you'll have to get new exhausts.

Wil

Fastest 998 mini in the world? 13.05 1/4 mile 106mph



On 2nd Jan, 2013 fastcarl said:
the design shows a distinct lack of imagination,
talk about starting off with a clean sheet of paper, then not bothering to fucking draw on it,lol

On 20th Apr, 2012 Paul S said:
I'm mainly concerned about swirl in the runners caused by the tangential entry.


Vegard

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I pick holes in everything..

Chief ancient post excavator

Norway

27th May, 2005 at 08:54:26am

Inlets are VERY hard to find to be honest. I had to machine down some AEG163 35,6mm valve for my head. If the inlet valve seats are fine, you're OK, but if you need an oversize, beware.

On 13th Jul, 2012 Ben H said:
Mine gets in the way a bit, but only when it is up. If it is down it does not cause a problem.
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