Return-Path: Sender: (Marvin Kaye) To: flyrotary@lancaironline.net Date: Wed, 19 Nov 2003 13:52:11 -0500 Message-ID: X-Original-Return-Path: Received: from wb1-a.mail.utexas.edu ([128.83.126.134] verified) by logan.com (CommuniGate Pro SMTP 4.1.8) with ESMTP-TLS id 2751769 for flyrotary@lancaironline.net; Wed, 19 Nov 2003 13:48:17 -0500 Received: (qmail 30867 invoked from network); 19 Nov 2003 18:48:16 -0000 Received: from dhcp-191-101.per.utexas.edu (HELO benefits3.mail.utexas.edu) (146.6.191.101) by wb1.mail.utexas.edu with RC4-SHA encrypted SMTP; 19 Nov 2003 18:48:16 -0000 X-Original-Message-Id: <5.1.1.5.2.20031119123100.02349da8@localhost> X-Sender: msteitle@mail.utexas.edu@localhost X-Mailer: QUALCOMM Windows Eudora Version 5.1.1 X-Original-Date: Wed, 19 Nov 2003 12:48:09 -0600 X-Original-To: "Rotary motors in aircraft" From: Mark Steitle Subject: Re: [FlyRotary] Re: Renisis In-Reply-To: Mime-Version: 1.0 Content-Type: multipart/alternative; boundary="=====================_1539851829==.ALT" --=====================_1539851829==.ALT Content-Type: text/plain; charset="us-ascii"; format=flowed > >Every engine will be different, even from the same builder, so, in >general, I think the stock porting is adequate for this RPM range, and the >average installation should produce between 165 and 175 HP. Matching up >the ports would help, and street porting would be a big help. Then later, >if you want to go nuts, or put the Sun&Fun record away for good, you could >bridgeport the streetported engine, and go up to maybe 185 HP. Lynn, Thanks for the very informative posting. Since we don't have to comply with SCCA rules & regs (i.e. restrictors in the intakes), my question is how does peripheral porting compare with the above in regards to hp & longevity. How fast do you have to spin the rotary to get good benefit from peripheral porting? (Powersport Aviation claims 215 hp from their pp engines.) Thanks, Mark S. --=====================_1539851829==.ALT Content-Type: text/html; charset="us-ascii"

Every engine will be different, even from the same builder, so, in general, I think the stock porting is adequate for this RPM range, and the average installation should produce between 165 and 175 HP.  Matching up the ports would help, and street porting would be a big help. Then later, if you want to go nuts, or put the Sun&Fun record away for good, you could bridgeport the streetported engine, and go up to maybe 185 HP.
Lynn,
Thanks for the very informative posting.  Since we don't have to comply with SCCA rules & regs (i.e. restrictors in the intakes), my question is how does peripheral porting compare with the above in regards to hp & longevity.  How fast do you have to spin the rotary to get good benefit from peripheral porting?  (Powersport Aviation claims 215 hp from their pp engines.) 

Thanks,
Mark S. --=====================_1539851829==.ALT--