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adrian jaye's Avatar
 
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s2 inlet manifold

Has anyone had there Inlet manifold opened out, reground etc,

I know that the better an engine breathes the better it works,

any HP gains, also any probs or work then needed on either the throttle body/cylinder head

ta

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Old 02-19-2007, 09:15 AM
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I'm sure it can be done, but the results would be minimal at best, if any at all.
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Old 02-19-2007, 09:36 AM
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had some more input,

said not to port out but to "polish" instead
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Old 02-19-2007, 10:11 AM
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How do they polish those things, anyway? It's obviously impossible to reach all the way inside by hand.
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Old 02-19-2007, 10:16 AM
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They can actually polish them but that's not how horsepower is achieved. I've been building high hp engines forever and you polish the exhaust ports but building hp is not just about getting more air. If only it were that easy, we would just build bigger intakes. Everything has to be matched....if you have an intake that produces a high cfm of air but you try and push it through a head that only allows a litte cfm, there would be no gain because the head would hold it back. But now let's assume the head can take a huge amount of air....now the cylinders can only suck in so much air and after that, they are full so having the large intake and head did you no good. Now you go to forced induction or make the cylinders bigger because the cylinders are the bottleneck....you get the point...it all has to be matched and with no type of forced induction, making the intake larger will do you no good. With each engine, you have to find the bottlenecks and work on those particular areas...just picking the intake and working on that will give you marginal results if any at all. Also after the fuel enters the intake chambers, you don't want them polished as that actually reduces horsepower. Liquid fuel doesn't burn only vapor. Bouncing fuel drops against a rough sharp surface is a great way to break the larger drops into smaller ones bringing it closer to atomization. Try getting an eye dropper full of water and drop one drop on the counter. Notice you still have one large drop of water on the counter. Now make that drop of water hit the side of a knife before it hits the counter...notice you have many smaller drops of water. Smaller molecules = more hp.

I would bet the Porsche engineers who know a little about performance themselves did a pretty good job of matching all those intake components and you would have to change all the components to see a real gain.
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Old 02-19-2007, 12:10 PM
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get in contact with customengineeredperformance.com

they deal with this kind of thing. The intake manifold and trottle body are the main restrictions on the 16V cars. The head can flow almost 2 times the amount the intake can.
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Old 02-19-2007, 12:36 PM
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this is what I heard

will look at the link
thankxs

Quote:
Originally posted by jgp0rsche
get in contact with customengineeredperformance.com

they deal with this kind of thing. The intake manifold and trottle body are the main restrictions on the 16V cars. The head can flow almost 2 times the amount the intake can.

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Old 02-20-2007, 03:57 AM
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