Return-Path: Received: from [65.54.169.102] (HELO hotmail.com) by logan.com (CommuniGate Pro SMTP 4.2b3) with ESMTP id 3221436 for flyrotary@lancaironline.net; Sat, 08 May 2004 09:46:42 -0400 Received: from mail pickup service by hotmail.com with Microsoft SMTPSVC; Sat, 8 May 2004 06:46:42 -0700 Received: from 4.174.3.202 by bay3-dav72.adinternal.hotmail.com with DAV; Sat, 08 May 2004 13:46:42 +0000 X-Originating-IP: [4.174.3.202] X-Originating-Email: [lors01@msn.com] X-Sender: lors01@msn.com From: "Tracy Crook" To: "Rotary motors in aircraft" Subject: Re: [FlyRotary] Re: fuel injector prices Date: Sat, 8 May 2004 09:46:42 -0400 MIME-Version: 1.0 X-Mailer: MSN Explorer 7.02.0011.2700 Content-Type: multipart/alternative; boundary="----=_NextPart_001_0000_01C434E1.5E3D0600" Message-ID: X-OriginalArrivalTime: 08 May 2004 13:46:42.0504 (UTC) FILETIME=[E5377480:01C43502] ------=_NextPart_001_0000_01C434E1.5E3D0600 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable ----- Original Message ----- From: Bulent Aliev Sent: Friday, May 07, 2004 7:54 AM To: Rotary motors in aircraft Subject: [FlyRotary] Re: fuel injector prices On 5/6/04 11:31 PM, "John Slade" wrote: >> 550 cc/min =3D 0.1453 Gallons. So 0.1453 Gallons * 60 (minutes) =3D= 8.718 >> Gallons/ hour x 6 (lbs/gallon) =3D 52 lbs/ hr. Or a 550 cc/min >> injector would >> flow approx 52 lbs of fuel if it flowed wide open for one hour or >> 52 lbs/hr. >> =20 >> for the NA engines the stock injector is the 460 cc/min (sometimes the= y >> varied a bit around that figure) >> 460 cc/min =3D 0.1215191gallons so performing the same >> calculations =3D 7.29114 >> gallons/hr x 6 =3D 43.75 lbs/hour > =20 > Ed. > Thanks. I follow that. So with 4 of these 550cc suckers going full belt= I'd > be capable of expelling 52/6 * 4 =3D 34.67 gals/hr. Seems a bit excess= ive! > Also - does fuel pressure factor into the equasion? > John John, I believe it does. If the EC2 controls only the pulse length, Highe= r pressure will expel larger quantity of fuel than lower pressure for the s= ame injector opening. I don't think the EC2 takes into account the capacity o= f the injector? Bulent =20 Yes, pressure will definitely affect flow rate. There is a standard pres= sure that is used (40 psi I think) to spec injectors at. Mazda regulator= s put out between 35 - 40 psi depending on manifold pressure. An EFI system that didn't take into account the injector flow rate would = be doomed to failure. Mode 3 on the EC2 is there to compensate for diff= erences in flow rate. There is always a limit to how much can be compens= ated for, of course. Tracy ------=_NextPart_001_0000_01C434E1.5E3D0600 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
 
<= DIV> 
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----- Original Message -----
From: Bulent Aliev
Sent: Friday,= May 07, 2004 7:54 AM
To: Ro= tary motors in aircraft
Subject:= [FlyRotary] Re: fuel injector prices
 

On 5= /6/04 11:31 PM, "John Slade" <sladerj@bellsouth.net> wrote:

= >>   550 cc/min =3D 0.1453 Gallons.  So 0.1453 Gallo= ns * 60 (minutes) =3D 8.718
>> Gallons/ hour x 6 (lbs/gallon) =3D= 52 lbs/ hr.  Or a 550 cc/min
>> injector would
>>= flow approx 52 lbs of fuel if it flowed wide open for one hour or
>= ;> 52 lbs/hr.
>>
>> for the NA engines the stock in= jector is the 460 cc/min (sometimes they
>> varied a bit around = that figure)
>> 460 cc/min =3D  0.1215191gallons so perform= ing the same
>> calculations =3D 7.29114
>> gallons/hr = x 6 =3D 43.75 lbs/hour
>
> Ed.
> Thanks. I follow that= So with 4 of these 550cc suckers going full belt I'd
> be capable= of expelling  52/6 * 4 =3D 34.67 gals/hr. Seems a bit excessive!> Also - does fuel pressure factor into the equasion?
> John
John, I believe it does. If the EC2 controls only the pulse length, = Higher
pressure will expel larger quantity of fuel than lower pressure= for the same
injector opening. I don't think the EC2 takes into accou= nt the capacity of
the injector?
Bulent

Yes, pressu= re will definitely affect flow rate.  There is a standard pressure t= hat is used (40 psi I think) to spec injectors at.  Mazda regulators= put out between 35 - 40 psi depending on manifold pressure.

An EF= I system that didn't take into account the injector flow rate would be do= omed to failure.   Mode 3 on the EC2 is there to compensate for= differences in flow rate.  There is always a limit to how much can = be compensated for, of course.

Tracy

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