Mailing List flyrotary@lancaironline.net Message #38715
From: George Lendich <lendich@optusnet.com.au>
Subject: Re: [FlyRotary] Re: carbs vs efi
Date: Wed, 25 Jul 2007 17:42:36 +1000
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Re your analysis comparing side ports with p ports, I wonder if such an analysis is even possible as they are quite different.? Anyway, I doubt that a standard port can deliver 100 hp or a street port 130 hp. per rotor, certainly not when limited to 7500 rpm.? Of course I am only guessing.? No real knowledge or experience.??
From a Daryl Drummond dyno sheet for a 12A bridge ported running 36MM chokes. One per housing.
 
6,500 RPM 139.6 Torque 173.3 HP
7,000 RPM 147.6 Torque  196.9 HP
7,500 RPM 152.6  Torque  218.2 HP Front EGT 1518/ Rear EGT 1492/ BSFC .671 oil 164/ pressure 100.1
 
F/A 12.1
 
Main 210/ air .80. A Pport with a slightly larger choke would better. A 13B Pport would do still better.
 
A 13B Pport injected would do much better.
 
Lynn E. Hanover

Lynn,
I was going to suggest we hear from you, those figures fit nicely with what I've heard and although the bridge port is bigger again than the street port, I figure the bridge ported 12A might equate to a street ported 13B 41/44mm choke. Those figures with a 36mm choke is right up there at the top I would assume.
Good stuff!
George ( down under) 


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