messham11
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Registered: 15th Aug 04
Location: Berkshire
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Just wondering what power gais im lookin at on my 1.4 16v if i have the head skimmed and ported??
Cheers
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JJ
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Registered: 20th Apr 00
Location: Northern Ireland
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Not much to be honest... get an inlet manifold to go with it and match the ports up... also... a unichip would further improve things as well as an exhaust manifold  should be lookin 20bhp+
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James R
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Registered: 4th Feb 03
Location: 205GTi16/306GTi16
User status: Offline
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Courtney quotre 15% gains from there flowed head. But more realistic is roughly 10% power gain, the mathcing of inlet to head isn't what gives the gains it's the reprofiling of the ports shape around the valve throat and exhaust radius. If your thinking of not doing anythign else it's not really worth the £300-400 it will cost, but if you inted to tune things futher then it's a good base to go from, other wise a tubular manifold would improve things much more for you.
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ed
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Registered: 10th Sep 03
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It doesn't really increase power. It makes the engine rev freely, with less restriction, so will make any other mods you have done on the engine work to a higher standard.
A head skim doesn't increase power, it makes the head fit the block correctly if it has warped.
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miles
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Registered: 25th Mar 02
Location: plymouth Drives: Astra Sport
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Skim will increase power as it raises the compression. How much power would obviously depend on how much is skimmed.
We're not talking much but its extra power all the while.
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James R
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Registered: 4th Feb 03
Location: 205GTi16/306GTi16
User status: Offline
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quote:
Originally posted by 1800ed
It doesn't really increase power. It makes the engine rev freely, with less restriction, so will make any other mods you have done on the engine work to a higher standard.
A head skim doesn't increase power, it makes the head fit the block correctly if it has warped.
Porting will increase the VE of the engine, so will make it more power as more air can be sucked in and pushed out.
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Stu_22
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Registered: 25th Mar 02
Location: Luton
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VE-??
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luca2020
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Registered: 26th May 02
Location: Maidstone, Kent
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yer as miles said you can skim the head, this raises the compression ratio so will give a small gain
but if you get the head skimmed dont skim it too much, i think i had my nova skimmed about 3/4 thou (n/1000th of an inch)
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miles
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Registered: 25th Mar 02
Location: plymouth Drives: Astra Sport
User status: Offline
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My head was skimmed 25 thou.
VE = Volumetric efficiency.
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