X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from fed1rmmtao102.cox.net ([68.230.241.44] verified) by logan.com (CommuniGate Pro SMTP 5.2.5) with ESMTP id 3041179 for flyrotary@lancaironline.net; Thu, 24 Jul 2008 20:29:49 -0400 Received-SPF: none receiver=logan.com; client-ip=68.230.241.44; envelope-from=alventures@cox.net Received: from fed1rmimpo02.cox.net ([70.169.32.72]) by fed1rmmtao102.cox.net (InterMail vM.7.08.02.01 201-2186-121-102-20070209) with ESMTP id <20080725002910.BZJS6684.fed1rmmtao102.cox.net@fed1rmimpo02.cox.net> for ; Thu, 24 Jul 2008 20:29:10 -0400 Received: from BigAl ([72.192.137.74]) by fed1rmimpo02.cox.net with bizsmtp id u0VA1Z00B1cVYgg040VAmj; Thu, 24 Jul 2008 20:29:10 -0400 From: "Al Gietzen" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: 13B--- N/A vs. Turbo engine buildup? Date: Thu, 24 Jul 2008 17:30:46 -0800 Message-ID: <000401c8edf6$0fed3240$6401a8c0@BigAl> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0005_01C8EDB3.01C9F240" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6626 Importance: Normal In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3198 This is a multi-part message in MIME format. ------=_NextPart_000_0005_01C8EDB3.01C9F240 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Would there be a compression problem running it sans turbo? (Hearsay has = it that it would be a "dog".) =20 Definitely would not be a "dog". Best I could figure based on data that Mazda generated, at 5500-6000 rpm the 9.0 compression could be about 4% penalty vs 9.7. More at lower rpm. And that would be for WOT. If you = run a 2.85 : 1 re-drive ratio and run 6500 -7000 it's likely there is not a measurable difference. Al G ------=_NextPart_000_0005_01C8EDB3.01C9F240 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Would there be a compression problem running = it sans turbo? (Hearsay has it that it would be a "dog".) =

Definitely would not be a = “dog”. Best I could figure based on data that Mazda generated, at 5500-6000 rpm = the 9.0 compression could be about 4% penalty vs 9.7. More at lower = rpm. And that would be for WOT. If you run a 2.85 : 1 re-drive ratio and run 6500 = -7000 it’s likely there is not a measurable difference.

Al G

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