---------------------------------------------------------- TeamGrumman-List Digest Archive --- Total Messages Posted Wed 09/08/04: 1 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 10:49 PM - AA-1 O-320 upgrade Air Box/Intake Geometry (Steven Jackson) ________________________________ Message 1 _____________________________________ Time: 10:49:56 PM PST US From: "Steven Jackson" Subject: TeamGrumman-List: AA-1 O-320 upgrade Air Box/Intake Geometry --> TeamGrumman-List message posted by: "Steven Jackson" TG, Can someone explain to me how the size of the intake, air box, etc affects the way the engine performs--i.e.. is there some type of equation that gives you the ideal volume or dimensions of the air intake/air box for a given engine? The theory on the table is that the stock AA-1 air box is too small for an O-320 conversion. If so, what would be the ideal size? If a bigger air box is placed on the plane, would the actual intake on the nose bowl need to be bigger as well? Would there be an increased drag penalty if the intake was bigger? My mechanic says there's not much of a ram air effect with a simple piston plane via the intake on the nose bowl. He says that the engine sucks in as much as it needs and doesn't get "forced" air. I'm assuming that there would be a point where the hole that the engine is "sucking" through would be too small for the engine? Just looking for some theory and practical application, Steven Jackson N1434R L22 Yucca Valley, CA