Return-Path: Received: from [24.25.9.103] (HELO ms-smtp-04-eri0.southeast.rr.com) by logan.com (CommuniGate Pro SMTP 4.2.8) with ESMTP id 618273 for flyrotary@lancaironline.net; Sun, 23 Jan 2005 10:30:37 -0500 Received-SPF: none receiver=logan.com; client-ip=24.25.9.103; envelope-from=eanderson@carolina.rr.com Received: from edward2 (cpe-024-074-185-127.carolina.rr.com [24.74.185.127]) by ms-smtp-04-eri0.southeast.rr.com (8.12.10/8.12.7) with SMTP id j0NFU1Ci010793 for ; Sun, 23 Jan 2005 10:30:03 -0500 (EST) Message-ID: <002101c50160$b6690030$2402a8c0@edward2> From: "Ed Anderson" To: "Rotary motors in aircraft" Subject: 12:1 vs 1:1 Pressure Regulation Date: Sun, 23 Jan 2005 10:32:13 -0500 MIME-Version: 1.0 Content-Type: multipart/related; type="multipart/alternative"; boundary="----=_NextPart_000_001D_01C50136.CD5293D0" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1106 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 X-Virus-Scanned: Symantec AntiVirus Scan Engine This is a multi-part message in MIME format. ------=_NextPart_000_001D_01C50136.CD5293D0 Content-Type: multipart/alternative; boundary="----=_NextPart_001_001E_01C50136.CD5293D0" ------=_NextPart_001_001E_01C50136.CD5293D0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Here is some food for thought for you turbo folks. Most of the pressure = referenced fuel regulators regulate the fuel rail pressure on a 1:1 = ratio with the manifold pressure change. In other words if the manifold = pressure changes 1psi (2" HG) the fuel pressure changes 1 psi. This = increase does of course increase the rate at which the fuel will flow = through the injector. However, the flow rate changes on the order of = the square root of the pressure increase (as best I recall). This = means if you double your fuel pressure you Do NOT double your fuel flow. = =20 With higher boost pressures the preferred regulation ratio is like 12:1 = or 12 psi for each psi of manifold pressure. Not certain that for the = lower boost levels being used in aircraft whether this is really = significant - but, just though I would pass this on in case anyone wants = to investigate it further or comment. =20 BLOX FMUs=20 The Blox fuel management unit is designed to increase the fuel pressure = as the pressure in the intake manifold increases. The Blox FMU is a = universally design product with a 12:1 fixed ratio. The FMU is used on = fuel injected vehicles, either supercharged or turbocharged, using the = factory electronic engine management system. Blox FMU's are available in = blue, red, gold and gun metal Ed=20 Ed Anderson Rv-6A N494BW Rotary Powered Matthews, NC eanderson@carolina.rr.com ------=_NextPart_001_001E_01C50136.CD5293D0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Here is some food for thought for you = turbo=20 folks. Most of the pressure referenced fuel regulators regulate = the fuel=20 rail pressure on a 1:1 ratio with the manifold pressure change. In = other=20 words if the manifold pressure changes 1psi (2" HG) the fuel pressure = changes 1=20 psi. This increase does of course increase the rate at which the = fuel will=20 flow through the injector. However, the flow rate changes on the = order of=20 the square root of the pressure increase (as best I = recall). =20 This means if you double your fuel pressure you Do NOT double your fuel=20 flow.

With higher boost pressures the = preferred=20 regulation ratio is like 12:1 or 12 psi for each psi of manifold=20 pressure. Not certain that for the lower boost levels being = used in=20 aircraft whether this is really significant - but, just though I = would pass=20 this on in case anyone wants to investigate it further or=20 comment.

BLOX=20 FMUs
The Blox fuel management unit is designed to increase = the fuel=20 pressure as the pressure in the intake manifold increases. The Blox FMU = is a=20 universally design product with a 12:1 fixed ratio. The FMU is used on = fuel=20 injected vehicles, either supercharged or turbocharged, using the = factory=20 electronic engine management system. Blox FMU=92s are available in blue, = red, gold=20 and gun metal

Ed Anderson
Rv-6A N494BW Rotary=20 Powered
Matthews, NC
eanderson@carolina.rr.com

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