X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Thu, 24 Jan 2008 08:03:36 -0500 Message-ID: X-Original-Return-Path: Received: from imo-m25.mx.aol.com ([64.12.137.6] verified) by logan.com (CommuniGate Pro SMTP 5.2c4) with ESMTP id 2690521 for lml@lancaironline.net; Wed, 23 Jan 2008 16:26:22 -0500 Received-SPF: pass receiver=logan.com; client-ip=64.12.137.6; envelope-from=Sky2high@aol.com Received: from Sky2high@aol.com by imo-m25.mx.aol.com (mail_out_v38_r9.3.) id q.cd1.26139c92 (48552) for ; Wed, 23 Jan 2008 16:25:33 -0500 (EST) From: Sky2high@aol.com X-Original-Message-ID: X-Original-Date: Wed, 23 Jan 2008 16:25:46 EST Subject: Re: [LML] Re: Pressurized Injectors X-Original-To: lml@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="-----------------------------1201123546" X-Mailer: Unknown sub 34 X-Spam-Flag: NO -------------------------------1201123546 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Content-Language: en In a message dated 1/23/2008 12:18:25 P.M. Central Standard Time, =20 Adam@ValidationPartners.com writes: =20 >he's right about adding upper deck pressure to the injectors to increase=20 the differential pressure between MP and cowl pressure into >the injector.= =20 This is from TCM=E2=80=99s =E2=80=9CContinental Engine Theory=E2=80=9D trai= ning manual. If you=20 believe what TCM says, we have all been barking up the wrong tree. The inje= ctor=20 nozzle behaves like the shower head in your bathroom. Fuel dribbles in big=20 droplets at low flow rates, and atomizes nicely at high fuel flows. The air= =20 bleed is there to help with atomization at low power settings, which=20 coincidentally provide lots of pressure differential between MAP and ambien= t.=20 Adam, =20 Excellent excerpt. Remember that when operating LOP at higher altitudes=20 the fuel flow may be half or less than that used at 100% power but 3 or 4 t= imes=20 that used at idle. Also, remember that the engine manufacturer may assume,= =20 for NA engines, that the absolute manifold pressure (MAP) is never higher=20 than the pressure available at the hole(s) in the injector. Ram air,=20 superchargers or turbo chargers change that relationship. =20 =20 Note that the injectors in my Lycoming engine have only one hole for the=20 introduction of air. =20 Some of us are not barking up the wrong tree - we have seen the results of=20 this "experiment." =20 Scott Krueger AKA Grayhawk Lancair N92EX IO320 SB 89/96 Aurora, IL (KARR) Pilot not TSO'd, Certificated score only > 70%. **************Start the year off right. Easy ways to stay in shape. =20 http://body.aol.com/fitness/winter-exercise?NCID=3Daolcmp00300000002489 -------------------------------1201123546 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Content-Language: en

In a message dated 1/23/2008 12:18:25 P.M. Central Standard Time,= =20 Adam@ValidationPartners.com writes:=20 <= FONT=20 style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000 size= =3D2>

>he's right= about=20 adding upper deck pressure to the injectors to increase the differential=20 pressure between MP and cowl pressure into >the=20 injector.

This is from TC= M=E2=80=99s=20 =E2=80=9CContinental Engine Theory=E2=80=9D training manual. If you=20= believe what TCM=20 says, we have all been barking up the wrong tree. The injector nozzle beha= ves=20 like the shower head in your bathroom. Fuel dribbles in big droplets at lo= w=20 flow rates, and atomizes nicely at high fuel flows. The air bleed is there= to=20 help with atomization at low power settings, which coincidentally provide=20= lots=20 of pressure differential between MAP and ambient.=

&= nbsp;

Adam,

&= nbsp;

Excellent excerpt.&nb= sp; =20 Remember that when operating LOP at higher altitudes the fuel flow may be ha= lf=20 or less than that used at 100% power but 3 or 4 times that used at idle.&nbs= p;=20 Also, remember that the engine manufacturer may assume, for NA=20 engines, that the absolute manifold pressure (MAP) is never=20 higher than the pressure available at the hole(s) in the injector. Ram= =20 air, superchargers or turbo chargers change that relationship. =20

&= nbsp;

Note that the injecto= rs in my=20 Lycoming engine have only one hole for the introduction of=20 air.

&= nbsp;

Some of us are not ba= rking up the=20 wrong tree - we have seen the results of this "experiment."=20

Scott Krueger=20 AKA Grayhawk
Lancair N92EX IO320 SB 89/96
Aurora, IL (KARR)

Pil= ot=20 not TSO'd, Certificated score only >=20 70%.

<= BR>

Start the year off right. Easy ways to stay in shape in the new year.

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