X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from mail17.syd.optusnet.com.au ([211.29.132.198] verified) by logan.com (CommuniGate Pro SMTP 5.1.10) with ESMTPS id 2197745 for flyrotary@lancaironline.net; Wed, 25 Jul 2007 03:43:21 -0400 Received-SPF: none receiver=logan.com; client-ip=211.29.132.198; envelope-from=lendich@optusnet.com.au Received: from george (d211-31-107-198.dsl.nsw.optusnet.com.au [211.31.107.198]) by mail17.syd.optusnet.com.au (8.13.1/8.13.1) with SMTP id l6P7gZps010210 for ; Wed, 25 Jul 2007 17:42:36 +1000 Message-ID: <008201c7ce8f$5f2f5090$c66b1fd3@george> From: "George Lendich" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: carbs vs efi Date: Wed, 25 Jul 2007 17:42:36 +1000 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_007F_01C7CEE3.30349940" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.2180 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 X-Antivirus: avast! (VPS 0657-0, 12/12/2006), Outbound message X-Antivirus-Status: Clean This is a multi-part message in MIME format. ------=_NextPart_000_007F_01C7CEE3.30349940 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable 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.=20 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)=20 -------------------------------------------------------------------------= ----- Get a sneak peek of the all-new AOL.com. ------=_NextPart_000_007F_01C7CEE3.30349940 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Re your=20 analysis comparing side ports with p ports, I wonder if such an analysis = is even=20 possible as they are quite different.? Anyway, I doubt that a standard = port can=20 deliver 100 hp or a street port 130 hp. per rotor, certainly not when = limited to=20 7500 rpm.? Of course I am only guessing.? No real knowledge or=20 experience.??
From a Daryl Drummond dyno sheet for a 12A bridge ported running = 36MM=20 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=20 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=20 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=20 what I've heard and although the bridge port is bigger again than the = street=20 port, I figure the bridge ported 12A might equate to a street ported = 13B=20 41/44mm choke. Those figures with a 36mm choke is right up there at = the top I=20 would assume.
Good stuff!
George ( down under) 

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