X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from mail-pw0-f52.google.com ([209.85.160.52] verified) by logan.com (CommuniGate Pro SMTP 5.3.6) with ESMTP id 4249468 for flyrotary@lancaironline.net; Thu, 06 May 2010 01:11:07 -0400 Received-SPF: pass receiver=logan.com; client-ip=209.85.160.52; envelope-from=archerwt@gmail.com Received: by pwi1 with SMTP id 1so2777406pwi.25 for ; Wed, 05 May 2010 22:10:31 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:from:to:in-reply-to:subject :date:message-id:mime-version:content-type:x-priority :x-msmail-priority:x-mailer:thread-index:importance:x-mimeole; bh=2JRzzuO46nsT8hv3YsxABPtxIAIwaeehEr8wIP84/Iw=; b=OTzLJ5kiiJE+T7mTtFRbuJRFaA9tHBan4BXbXhHSG+tY80xPqEB3Q/nxW+soPs4urD Frt3/3CR+uAd+HKczJtK7cUJiqU/frAd3OdasaGhlhIp0323c6VKoy1x3u6/Rmkcdhei CE/qU62ucLN0UgkjfskKgfLoKnX4aB9UdVmSk= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=from:to:in-reply-to:subject:date:message-id:mime-version :content-type:x-priority:x-msmail-priority:x-mailer:thread-index :importance:x-mimeole; b=rjLppQBmjhtvMR9poYQ767egIhOSPNJmGrePYAnG+WR9fU1+oBrxfqHlxPTco68PFn 6ecBY122HacDEqMH42OtBz4GmCZZdhGDjEZVa8wM7De9heepPwiA4tO5emFxgZRg1IaZ xCCa60d7fsv19SFc5AWGiLMjYPsc3dPucXxQs= Received: by 10.140.58.7 with SMTP id g7mr6384340rva.37.1273122631294; Wed, 05 May 2010 22:10:31 -0700 (PDT) Return-Path: Received: from kitchen (ppp-71-128-204-98.dsl.sndg02.pacbell.net [71.128.204.98]) by mx.google.com with ESMTPS id h11sm287043rvm.21.2010.05.05.22.10.29 (version=SSLv3 cipher=RC4-MD5); Wed, 05 May 2010 22:10:30 -0700 (PDT) From: "Todd Archer" To: "'Rotary motors in aircraft'" In-Reply-To: Subject: RE: [FlyRotary] Re: Gravity Feed Date: Wed, 5 May 2010 22:10:26 -0700 Message-ID: <851666FBE97E4D5D8C99C9231C0499EE@kitchen> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_003C_01CAEC9F.C4818C20" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6856 thread-index: Acrsw9wqvUv/IaWeSSyEDww+9/UwwQAFm5sg Importance: Normal X-MimeOLE: Produced By Microsoft MimeOLE V6.0.6002.18005 This is a multi-part message in MIME format. ------=_NextPart_000_003C_01CAEC9F.C4818C20 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit There are a lot of O-470s that are gravity, right? Todd I don't thing there was ever a 300hp motor that ran a carb. Those high HP motors had fuel injection.. IIRC there was some 240 -260 hp ones but they had a mech fuel pump on the motor to boost the flow.. Ben Haas www.haaspowerair.com Anyone who knows feel free to explain to me why a Marvel-Schebler updraft can feed 300 hp with gravity but pumps are needed for Webers or Holleys. I understand the updraft gets another 18" of pressure but am assuming it is simply by design that the response is improved with a few lbs of pressure. Since we aren't too worried about throttle response as long as it doesn't stumble, would a gravity-fed Holley be a waste of time? Todd ------=_NextPart_000_003C_01CAEC9F.C4818C20 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

There are a lot of O-470s that are gravity, = right?

Todd

I don't thing there was ever a 300hp motor that ran a carb. Those high HP = motors had fuel injection.. IIRC there was some 240 -260 hp ones but they had = a mech fuel pump on the motor to boost the flow..

Ben = Haas
www.haaspowerair.com

Anyone who = knows feel free to explain to me why a Marvel-Schebler updraft can feed 300 hp with gravity but pumps are needed for Webers or Holleys. I understand = the updraft gets another 18” of pressure but am assuming it is simply = by design that the response is improved with a few lbs of pressure. Since we = aren’t too worried about throttle response as long as it doesn’t stumble, = would a gravity-fed Holley be a waste of time?

Todd

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