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what mods for a turbo head

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minimarc

Post subject: what mods for a turbo head

Posted: Fri Nov 05, 2004 8:42 pm

848cc

Joined: Mon Jul 05, 2004 12:09 pm
Posts: 155
Location: Brisbane

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

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drmini in aust

Post subject: Re: what mods for a turbo head

Posted: Fri Nov 05, 2004 9:38 pm

religious status

Joined: Fri Mar 19, 2004 6:19 pm
Posts: 39754
Location: near Baulkham Hills, NSW

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.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R. :mrgreen:

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gafmo

Post subject:

Posted: Fri Nov 05, 2004 9:55 pm

the King of Bling

Joined: Thu Jun 03, 2004 11:11 pm
Posts: 19858
Location: Baulkham Hills

That's a bog amount of Air :?:

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minimarc

Post subject:

Posted: Fri Nov 05, 2004 10:20 pm

848cc

Joined: Mon Jul 05, 2004 12:09 pm
Posts: 155
Location: Brisbane

s/s stanless steel valves you mean

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kazjim

Post subject:

Posted: Fri Nov 05, 2004 10:28 pm

1098cc

Joined: Tue Apr 06, 2004 2:49 pm
Posts: 1556
Location: Central Coast, NSW

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

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gafmo

Post subject:

Posted: Fri Nov 05, 2004 10:34 pm

the King of Bling

Joined: Thu Jun 03, 2004 11:11 pm
Posts: 19858
Location: Baulkham Hills

kazjim wrote:

A turdo on a standed head 202head :shock:

The beak must go, even, the beak is removed from Sue' s standed 202 non turbo :?:

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minimarc

Post subject:

Posted: Fri Nov 05, 2004 10:39 pm

848cc

Joined: Mon Jul 05, 2004 12:09 pm
Posts: 155
Location: Brisbane

mnmn interesting stainless steel valves
double valve springs im quessing

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