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Old 12-04-2006, 12:21 PM   #11
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Quote:
Originally Posted by BillBoost37
Quote:
Originally Posted by driverjohn2005
I don't care about the intake as much as wtf is up with the turbo looking indentation on the top of the engine
If it'* not just a cover, then it'* most likely a tuned intake as mentioned.
Well, it'* obvious it'* not the cover, otherwise it would be plastic as well.

If the "tuned Intake" one of the major differences between the S3 and the 3.9 V6 (Other than the .1 liters bigger)
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Old 12-04-2006, 12:21 PM   #12
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Quote:
Originally Posted by J Wikoff
If you have a certain length and diameter of an intake runner (on an NA engine), the speed attained by the air on the intake stroke can help pull in more air by using the air'* momentum. Done properly, you can acheive slight positive pressure right before the intake valve closes. It will work best at one RPM, so any fixed runner length is a compromise.
And with the long length of that tube it'* obviously for low RPM, hence keeping the image of the V6 stump puller.
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Old 12-04-2006, 12:21 PM   #13
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One marketing person probably asked to get rid of it. One engineer said he needed it for his intake runner length. Another marketer said it looks cool so lets make it a cutout through the engine cover.
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Old 12-04-2006, 12:23 PM   #14
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Quote:
Originally Posted by J Wikoff
If you have a certain length and diameter of an intake runner (on an NA engine), the speed attained by the air on the intake stroke can help pull in more air by using the air'* momentum. Done properly, you can acheive slight positive pressure right before the intake valve closes. It will work best at one RPM, so any fixed runner length is a compromise.
INTERESTING....
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Old 12-04-2006, 12:23 PM   #15
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Quote:
Originally Posted by J Wikoff
If you have a certain length and diameter of an intake runner (on an NA engine), the speed attained by the air on the intake stroke can help pull in more air by using the air'* momentum. Done properly, you can acheive slight positive pressure right before the intake valve closes. It will work best at one RPM, so any fixed runner length is a compromise.
but if they would have designed it to have either variable length runners or a variable diameter, then that tuned port could bennifit a much larger rpm range.

95nasta knows a lot about the tuned /variable port stuff.
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Old 12-04-2006, 12:23 PM   #16
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Sorry, too much info?
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Old 12-04-2006, 12:24 PM   #17
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Quote:
Originally Posted by J Wikoff
Sorry, too much info?
nope, keep going
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Old 12-04-2006, 12:26 PM   #18
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Quote:
Originally Posted by driverjohn2005
Well, it'* obvious it'* not the cover, otherwise it would be plastic as well.
Well..that single bolt in the center give the impression it may be a cover. Typically an intake isn't held on in such a fashion. Although it can be part of the bolting pattern.

A turbo would be part of the exhaust stream and too hot to be mounted under a plastic shield as seen in the pic.
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Old 12-04-2006, 12:28 PM   #19
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Quote:
Originally Posted by BillBoost37
Quote:
Originally Posted by driverjohn2005
Well, it'* obvious it'* not the cover, otherwise it would be plastic as well.
Well..that single bolt in the center give the impression it may be a cover. Typically an intake isn't held on in such a fashion. Although it can be part of the bolting pattern.

A turbo would be part of the exhaust stream and too hot to be mounted under a plastic shield as seen in the pic.
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Old 12-04-2006, 12:29 PM   #20
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Man it would pretty much suck to work on that engine.
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