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Post by coopdog on Feb 17, 2011 21:43:42 GMT 1
i have an 12G1805 head which is apparently is a mk3 S head  i was thinking about putting it on my 988 would that be over kill or alright? they details i have from it are thats it large valve and was on mk3 cooper s |
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Post by dai9fxey on Feb 17, 2011 23:09:56 GMT 1
Overkill with a capital O I'm afraid. Your compression ratios will be far too high because the chamber volume on that head is 21.4cc while the 998 head volume is 25.5cc. Not a practical head to have on a 998 sadly.  |
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Post by coopdog on Feb 17, 2011 23:35:18 GMT 1
awww o well :L
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ljonez
turbo
Built not bought
Posts: 3,734
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Post by ljonez on Feb 17, 2011 23:56:32 GMT 1
The 12g940 head ( standard 1275) also has a chamber size of 21.4cc and plenty of people use it with no problem, the higher compression ratio adds a bit of power but you might have to run shell optimax etc to avoid pinking and the engine killing itself. The standard 1275 valves are as big as you need on a 998
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Huntyfm
1440cc
If you cant fix it with a hammer its electrical.[F4:Huntyfm]
Posts: 2,633
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Post by Huntyfm on Feb 18, 2011 1:30:27 GMT 1
I assume a 1275 head on a 998 is like a Stage 2/3?
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ljonez
turbo
Built not bought
Posts: 3,734
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Post by ljonez on Feb 18, 2011 1:44:24 GMT 1
Pretty much yeah,
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Huntyfm
1440cc
If you cant fix it with a hammer its electrical.[F4:Huntyfm]
Posts: 2,633
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Post by Huntyfm on Feb 18, 2011 1:51:06 GMT 1
Two words for you. Bed. Work.
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