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what mods for a turbo head
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Author:  minimarc [ Fri Nov 05, 2004 8:42 pm ]
Post subject:  what mods for a turbo head
what needs to be done to take a say 12G940 head to being a head able to be used on a turbod engine
sodium valves etc are these needed
Author:  drmini in aust [ Fri Nov 05, 2004 9:38 pm ]
Post subject:  Re: what mods for a turbo head
minimarc wrote:
what needs to be done to take a say 12G940 head to being a head able to be used on a turbod engine
sodium valves etc are these needed


Current thinking is no, not needed- there have been cases in UK lately of the heads coming off sodium filled ones.. :shock:
Good race quality S/S ones are the go, according to most turbo jocks.
Main mod to a head for turbo use (apart from porting & valves) is get some volume into the chambers. Around 28cc is usually needed (stock is 21.4cc) to get the C/R down to around 8.0:1.
Author:  gafmo [ Fri Nov 05, 2004 9:55 pm ]
Post subject: 
That's a bog amount of Air :?:
Author:  minimarc [ Fri Nov 05, 2004 10:20 pm ]
Post subject: 
s/s stanless steel valves you mean
Author:  kazjim [ Fri Nov 05, 2004 10:28 pm ]
Post subject: 
Stainless here my friend......

I've got a 12G202 on a 998 Turbo, and I've still got a fair amount to take out of my chambers.... i'm developing it as i go.....

The main aim is to minimise detonation, while maximising chamber filling....
I'm going to remove the "beak" next time, i still feel that its a "hot-spot" .....

Good Luck!!
J
Author:  gafmo [ Fri Nov 05, 2004 10:34 pm ]
Post subject: 
kazjim wrote:
Stainless here my friend......

I've got a 12G202 on a 998 Turbo, and I've still got a fair amount to take out of my chambers.... i'm developing it as i go.....

The main aim is to minimise detonation, while maximising chamber filling....
I'm going to remove the "beak" next time, i still feel that its a "hot-spot" .....

Good Luck!!
J

A turdo on a standed head 202head :shock:
The beak must go, even, the beak is removed from Sue' s standed 202 non turbo :?: :idea:
Author:  minimarc [ Fri Nov 05, 2004 10:39 pm ]
Post subject: 
mnmn interesting stainless steel valves
double valve springs im quessing
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