Date: Tue, 02 Feb 1999 01:48:10 -0800
From: Paul <rotaryeng@earthlink.net>
To: z <rotaryeng@earthlink.net>
Subject: Dynamic Chamber Intake manifolds

Archie Frangoudis wrote:

Just a quick note on velocity. (piston engines)
Lycoming 0-200 +AD0- By raising and radiusing the intake port, and
using a smaller exhaust valve, velocity increased on the flow bench, 

and

proved itself in formula racing.

Automotive racing +AD0- Bigger is not necessarily better. Ex: On the 

large port

390 - 427 type Fords,
we brazed the lower portion of the exhaust ports, and epoxied the 

Intakes,

reducing the cross-section and improving airflow.

Proving that no matter how large a funnel is placed over your nose and
mouth, the volume of air taken in is dictated by the size of one's 

lungs.

(barring a restricted throat)
+ACI-D+ACI- shaped exhaust ports are working better with a short turn 

radius

pipe.(normally aspirated).

I realize that this has nothing to do with rotaries........ or does 

it?

Would appreciate commentary and/or experiences.
Rotary neophyte Archie

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