Return-Path: <13brv3@bellsouth.net> Received: from imf22aec.mail.bellsouth.net ([205.152.59.70] verified) by logan.com (CommuniGate Pro SMTP 4.2.4) with ESMTP id 453192 for flyrotary@lancaironline.net; Tue, 05 Oct 2004 08:28:58 -0400 Received-SPF: pass receiver=logan.com; client-ip=205.152.59.70; envelope-from=13brv3@bellsouth.net Received: from rd ([65.6.194.9]) by imf22aec.mail.bellsouth.net (InterMail vM.5.01.06.11 201-253-122-130-111-20040605) with ESMTP id <20041005122827.POPP1792.imf22aec.mail.bellsouth.net@rd> for ; Tue, 5 Oct 2004 08:28:27 -0400 From: "Russell Duffy" <13brv3@bellsouth.net> To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: Street Porting question Date: Tue, 5 Oct 2004 07:28:28 -0500 Message-ID: <00f201c4aad6$d197db50$6101a8c0@rd> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_00F3_01C4AAAC.E8C1D350" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6626 Importance: Normal X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 In-Reply-To: This is a multi-part message in MIME format. ------=_NextPart_000_00F3_01C4AAAC.E8C1D350 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Is there info in the archives, or another site that would provide diagrams or photos of what is done to the ports to improve breathing?=20 =20 Here's a page that shows various ports, and describes what to expect. = Most folks with ported engines have something along the lines of a "street = port", generally using the Racing Beat template. I believe that's what Bruce T = did to mine, and Tracy's (now removed) 13B. . =20 =20 http://www.fortunecity.com/silverstone/cowley/51/rx7facts.html=20 =20 I am rebuilding my 20B as a normally aspirated engine to install in the RV-10 I am building, and the 240 HP from stock is a little less than I = would like. Any input would be greatly appreciated. =20 =20 Phil in Willowbrook, RV-10 #40220=20 =20 As Al mentioned, you should be able to do much better than that, particularly if you're willing to run a C drive, and the RPM's necessary = to make power. Tracy documented over 200 HP from his 13B in the very low = 7000 rpm range, and I expect to do the same. That would give you 300 HP for = a 20B if you could duplicate that level of development. I would consider = that about the limit of what you could expect from a NA engine though, and it will require porting, high compression rotors, a good intake, exhaust, = etc. =20 Cheers, Rusty (ordering parts to rebuild the Kolb SlingShot) =20 =20 =20 ------=_NextPart_000_00F3_01C4AAAC.E8C1D350 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message
    Is = there info in=20 the archives, or another site that would provide diagrams or photos of = what is=20 done to the ports to improve breathing? 
 
Here's a = page that=20 shows various ports, and describes what to expect.   Most = folks with=20 ported engines have something along the lines of a "street port", = generally=20 using the Racing Beat template.  I believe that's what Bruce T = did to=20 mine, and Tracy's (now removed) 13B. =20 .    
 
h= ttp://www.fortunecity.com/silverstone/cowley/51/rx7facts.html&= nbsp;
 
I am=20 rebuilding my 20B as a normally aspirated engine to install in the RV-10 = I am=20 building, and the 240 HP from stock is a little less than I would = like. =20 Any input would be greatly appreciated.  
 
Phil in=20 Willowbrook, RV-10 #40220 
 
As Al=20 mentioned, you should be able to do much better than that, = particularly if=20 you're willing to run a C drive, and the RPM's necessary to make=20 power.  Tracy documented over 200 HP from his 13B in the = very low=20 7000 rpm range, and I expect to do the same.  That would give = you 300=20 HP for a 20B if you could duplicate that level of=20 development.  I would consider that about the limit = of what=20 you could expect from a NA engine though, and it will require = porting, high=20 compression rotors, a good intake, exhaust,=20 etc.  
 
Cheers,
Rusty = (ordering parts=20 to rebuild the Kolb SlingShot)   

 

 

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