Charlie12345
Member
Registered: 14th Apr 08
Location: Cambridgeshire
User status: Offline
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Whats The Difference?
Whats Better?
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Craig P
Member
Registered: 9th Mar 08
Location: Carlisle,Cumbria
User status: Offline
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Awaits Philip2 to come along and tell you what you want to know,Then he will try and get some Buisness
Top Bloke though
P.s Sorry i cant Help.
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philip2
Member
Registered: 1st Oct 06
Location: n.wales/chester
User status: Offline
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ha, ive not got a pic of a none ported head. but if you have one to look at here are a couple of pics of heads that ive ported:
none ported exhaust port 20xe(coscast head) not got a better pic of a unported exhaust port sorry
ported exhaust on a 20xe
match ported x16xe head(gaskets not quite fluch to face in that pic)
stock inlet port:
ported inlet on my tb'd XE:
should be able to see the differance. ported/polished head will always be better than a stock cast head. you open up the ports to let more air/fuel in and to let the spent gases get out quicker, helping make more power. obv gains depends on what induction you have i.e single throttle body, throttle bodies, or forced induction. exhaust manifold, cams, etc etc.
best thing is to search for porting.polishing on google and have a read. easier than me trying to put what i know into words
[Edited on 23-05-2009 by philip2]
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Craig P
Member
Registered: 9th Mar 08
Location: Carlisle,Cumbria
User status: Offline
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Hey he's here
I knew it wouldnt be long.Looks like you do a good job Mate.
Im still waiting to get my Head back and some Money together then i will be dropping you some Messages
I now know what you mean about matching the Gasket after seeing the above Pic.
Have you got anymore Pics of X16XE Heads?If so please U2U Me some?
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Sean-B
Member
Registered: 1st May 07
Location: Wolverhampton Drives: 200SX S14a
User status: Offline
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why dont the manufactures port the heads like you do as standard? what are the downsides to it?
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andyc1234
Member
Registered: 7th Nov 06
Location: Lancashire
User status: Offline
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its just the way they are made its not on purpose theres nothin wrong with a standard head but like with any thing it can be made better 
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philip2
Member
Registered: 1st Oct 06
Location: n.wales/chester
User status: Offline
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stock heads are good...coscast fair enough dont 'tend' to go porous, but the inlets on them are tiny compared to stock gm head. but it looks goodf on the spec sheet
also its not cost effective. it can take me about 3 days to do a 20xe head if i didnt have to take my mates to skim, cut seats could do one in a day(if had own seat cutter/skimmer) but, you cannot stand by a compressor for hours on end, it pisses you and others off.
so you can imagine how many heads they've produced so imagine if cost the company £400 a head to port....big unneeded expense as not everyone would want a ported head + you need to know what your doing,
craig will send some over
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Craig P
Member
Registered: 9th Mar 08
Location: Carlisle,Cumbria
User status: Offline
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Yeah i have Pics if anyone wants them?
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harrisp
Member
Registered: 15th Dec 07
Location: Derbyshire
User status: Offline
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Isnt the original poster on about subs?
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philip2
Member
Registered: 1st Oct 06
Location: n.wales/chester
User status: Offline
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dont know
either way he aint been very clear!
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Ian
Site Administrator
Registered: 28th Aug 99
Location: Liverpool
User status: Online
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Well it's been interesting discussing engines.
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