Dan295
Member
Registered: 9th Oct 06
Location: London
User status: Offline
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Im doing some research on cylinder head porting ie, size shape path of ports and the finish of the port, and how it can affect the performance of an engine, I know a few people on here have motorsport contacts, if anyone has any information could you e-mail it to me please (im doing research as it is but i need some from the motorsport world):
dcomber.110100@students.smu.ac.uk
it has to be from a reputable source even better if you work for a tuning company like jamsport perhaps 
Thanks.
Dan
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philip2
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Registered: 1st Oct 06
Location: n.wales/chester
User status: Offline
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what are you after essentially? just most of port work is in the throats. but then depending on if take material from top, lower or both side of port depends whther want torque or peak power screaming type motors.
there was a book when i was in uni a few years back about head porting. may be worth trying to look in local uni or similar for it. but one thing that stuck out was fact ford had so many cosworth heads ported with different finishes and they kept the kept with mirror ports in/ex where as the rougher heads were being sold to privateers and with the rougher finish on the inlets, making some more power.
all depends too of working long/short side/radius, which ever you prefer to call it to where you want the power
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Dan295
Member
Registered: 9th Oct 06
Location: London
User status: Offline
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yeah cheers for that philip, im going down there later as I reserved them earlier, I need a variety of references though and im just after some people from motorsport industry 
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RCS
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Registered: 26th Jan 05
Location: Lichfield/Dundee
User status: Offline
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David Vizard has a good book about modifications to A series engines which can be applied to any engine.
Also look for SAE papers on flow coefficients and discharge coefficients - thats the real science behind it. A good book on that is Design and Simulation of Four Stroke Racing Engines by Gordon Blair.
There isnt really a rule on what modifications give you what performance though (torque/power) - the performance is defined by the flow coefficient past the valve which is in turn dependent on the pressure ratio which is then defined by intake and exhaust tuning.
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