X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from mail05.syd.optusnet.com.au ([211.29.132.186] verified) by logan.com (CommuniGate Pro SMTP 5.1.10) with ESMTPS id 2199827 for flyrotary@lancaironline.net; Thu, 26 Jul 2007 03:27:11 -0400 Received-SPF: none receiver=logan.com; client-ip=211.29.132.186; envelope-from=lendich@optusnet.com.au Received: from george (d58-105-136-4.dsl.nsw.optusnet.com.au [58.105.136.4]) by mail05.syd.optusnet.com.au (8.13.1/8.13.1) with SMTP id l6Q7QQPd025417 for ; Thu, 26 Jul 2007 17:26:27 +1000 Message-ID: <001501c7cf56$48cd4e20$0488693a@george> From: "George Lendich" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: carbs vs efi Date: Thu, 26 Jul 2007 17:26:28 +1000 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0012_01C7CFAA.19A54540" 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_0012_01C7CFAA.19A54540 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable The Factory PP is large enough with an opening of 50mm x 43mm, about = 3sq" ( 50mm dia), which is fed by a 43mm inlet tube, about a 16% = reduction in diameter. I can't for the life of me figure out why the port opening has to be = so much larger than the inlet tube. It may be the duration of the open = inlet they are looking for. Do you know what sort of power they found with the 13B stock PP? Any how for those interested, I've settled on a 44mm inlet straight = tube with a late opening and late closing - same a stock PP IO 86 BTDC = and 75 BBDC. I can buy 41mm and 44mm tube and have opted for the 44mm ID inlet = tube, only 2.35sq" area. George ( down under) I have heard that the 13B Pport has over 330 HP around 10,500 RPM. The = port size at the rotor is just a result of late closing for operation at = the high RPM. It reduces velocity and hurts lower RPM power. Same with = the side port. Increasing bowl volume slows velocity and move peak power = up the RPM band. Where rules allow, side port people fill in part of the = bowl with epoxy to keep velocity high after extending the closing line. = We are not allowed to add material at all. Lynn E. Hanover Ah Ha - now you tell me Lynn, adding material sounds like something = I've heard before with people playing with metering the flow of the side = ports. I don't however think I will achieve 165hp, 125 would be nice. My motto "Aim High - Accept Less" George (down under) -------------------------------------------------------------------------= ----- Get a sneak peek of the all-new AOL.com. ------=_NextPart_000_0012_01C7CFAA.19A54540 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
The=20 Factory PP is large enough with an opening of 50mm x 43mm,  about=20 3sq"  ( 50mm dia), which is fed by a 43mm inlet tube, about a 16% = reduction=20 in diameter.
 
I can't for the life of me figure out why the port opening has = to be so=20 much larger than the inlet tube. It may be the duration of the open = inlet=20 they are looking for.
 
Do you know what sort of power they found with the 13B stock = PP?
 
Any how for those interested, I've settled on a 44mm inlet = straight=20 tube with a late opening and late closing - same a stock PP IO 86 = BTDC and=20 75 BBDC.
 
I can buy 41mm and 44mm tube and have opted for the 44mm ID = inlet tube,=20 only 2.35sq" area.
 
George ( down under)

I have heard that the 13B Pport has over 330 HP around 10,500 = RPM. The=20 port size at the rotor is just a result of late closing for operation = at the=20 high RPM. It reduces velocity and hurts lower RPM power. Same with the = side=20 port. Increasing bowl volume slows velocity and move peak power up the = RPM=20 band. Where rules allow, side port people fill in part of the bowl = with epoxy=20 to keep velocity high after extending the closing line.  We are = not=20 allowed to add material at all.
 
Lynn E. Hanover

Ah Ha - now you tell me Lynn, adding material sounds like = something=20 I've heard before with people playing with metering the flow of the = side=20 ports. I don't however think I will achieve 165hp, 125 would be=20 nice.
 
My motto "Aim High - Accept Less"
George (down under)

Get a sneak peek of the all-new AOL.com.
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