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| Home > 998cc > Skimmed 12g295 turbo ok? | |||||||
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5 Posts Member #: 9626 Junior Member |
18th Jul, 2013 at 04:21:08pm
Hi, I've got a 12g295 head, but it's been skimmed to 25cc... Will this be ok to use in a turbo project on a 998 engine? |
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 4629 Posts Member #: 20 My sister is so fit I won't show anyone her picture Lake District |
18th Jul, 2013 at 04:24:04pm
It depends what compression ratio you're trying to achieve. If there is enough volume in the chambers at 25cc to give you what you want, then yes.
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5 Posts Member #: 9626 Junior Member |
18th Jul, 2013 at 04:26:56pm
Would I be better off getting my standard head modded? or a 12g202? |
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4629 Posts Member #: 20 My sister is so fit I won't show anyone her picture Lake District |
18th Jul, 2013 at 04:33:17pm
The 295 flows better than both those heads in standard form. The 202 can be made to work well but requires considerable work.
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5 Posts Member #: 9626 Junior Member |
18th Jul, 2013 at 04:39:19pm
Basically I want a daily driver that goes like stink... I dunno if this is a stupid question, but if I had the 12g295 ported, would that lower the comp. ratio? |
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 361 Posts Member #: 114 Senior Member Porto/Portugal |
18th Jul, 2013 at 04:42:28pm
No Pedro Silva
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4629 Posts Member #: 20 My sister is so fit I won't show anyone her picture Lake District |
18th Jul, 2013 at 04:51:27pm
Porting the head has no effect on the compression ratio. Do you have the big yellow book "Tuning the A-Series engine" ? There's a good section on there explaining how to calculate the compression ratio.
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5 Posts Member #: 9626 Junior Member |
18th Jul, 2013 at 04:51:58pm
lol didn't know really... but the line of thinking was that there would be less metal on the cylinder head, and more space... It was a long shot lol |
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 7265 Posts Member #: 1268 The Boom Boom speaker Police! Essex |
18th Jul, 2013 at 05:10:20pm
Porting is done to the ports. To reduce the CR material needs to be removed from the chambers.
In the 13's at last!.. Just |
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 9258 Posts Member #: 123 Post Whore Betwix Harrogate and York |
18th Jul, 2013 at 05:46:45pm
25cc will be fine as long as you use 6cc dished pistons. 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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