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Home > Help Needed / General Tech Chat > Question for wil_h (regarding head usage on 998)

spidfer

36 Posts
Member #: 84
Member

11th May, 2004 at 03:07:16pm

Can anyone tell me what head they are using on their 998 turbo projects and what work was carried out on it?

I've given bill richard's racing a call, and they seem to think im going to need sodium filled exhaust valves turned down to fit the head etc..

I've decided to get a bit of a move on with this or i'll never do it!

turbodave16v
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10980 Posts
Member #: 17
***16***

SouthPark, Colorado

11th May, 2004 at 03:31:04pm

Stay away from the sodium valves - the heads seem to be 'falling off' an alarming number of them!!!!

On 17th Nov, 2014 Tom Fenton said:
Sorry to say My Herpes are no better


Ready to feel Ancient ??? This is 26 years old as of 2022 https://youtu.be/YQQokcoOzeY



spidfer

36 Posts
Member #: 84
Member

11th May, 2004 at 03:38:13pm

falling off?

AlexF2003

5795 Posts
Member #: 80
AFRacing LTD

Newbury, Berks

11th May, 2004 at 04:11:13pm

the head and the steam are seperate bits of steel... machined up and then friction welded together!!!!

Std high quality valves with thick stems (no 6mm racing jobbies) should be fine.

Alex

AlexF

wil_h

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9258 Posts
Member #: 123
Post Whore

Betwix Harrogate and York

12th May, 2004 at 07:35:36am

I do use the sodium filled valves. But as has been pointed out I use a 12G940 head so it was no problem fitting them.

Otherwise the head is standard except for the chamber which has had the lobe ground out mainly to drop the CR.

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.

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