03-29-2007, 09:58 AM
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Senior Member
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Join Date: Nov 2003
Location: Southern California
Posts: 3,589
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 Quote:
Originally Posted by GTV6PASSION
Jes why did you go with the 90 degree bend and not in the middle of the plenum like JJ has. An engineer told me that if you are forcing the air at one end like on the 90 degree the cylinders at the other end are getting a bit less air vs in the middle so all cylinders get the forced air more evenly.
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90  You mean the 180?
It makes another 25 HP this way, certified, dynoed, and approved    Don't tell me you went with the inferior design  Just kidding.
On a serious note:
1. Right now the air enters the plenum at an angle as designed by Alfa. I'm not saying this is better, but it cannot be all that bad. Besides, the 180* bend is a smooth bend and should not create any turbulence (if that is a concern).
2. I wanted factory reliability and wanted the 164S engine as close as possible to the way it was designed by Alfa in order not to jeopadarize performance with ill designs (although in good intention). Lets face it: no matter how clever and educated we believe we are, we are still amateurs (at least nost of us are) and don't have the knowledge and experience of the engineers who designed these things. So, as you may, or may not know, the 164S has the idle stabilizer and oil vapor separator on the side of the plenum. The oil vapor separator can be relocated fairly easily, but relocating the idle stabilizer is more complicated since it has a unique fitting on the plenum. I'm sure it can be done, but there really wasn't any point.
Jes
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87 Milano Verde - daily driver - Juliet
87 Milano 3.0 Motronic - budget race car - Roxanne
87 Milano 3.7 24v - race car
(Repeating what I suggest or do is at your own risk - be critical)
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