X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Sun, 16 Dec 2007 16:19:06 -0500 Message-ID: X-Original-Return-Path: Received: from imo-m23.mx.aol.com ([64.12.137.4] verified) by logan.com (CommuniGate Pro SMTP 5.2c1) with ESMTP id 2582675 for lml@lancaironline.net; Sat, 15 Dec 2007 15:35:09 -0500 Received-SPF: pass receiver=logan.com; client-ip=64.12.137.4; envelope-from=Sky2high@aol.com Received: from Sky2high@aol.com by imo-m23.mx.aol.com (mail_out_v38_r9.3.) id q.bee.1bfb9dc3 (41811) for ; Sat, 15 Dec 2007 15:34:27 -0500 (EST) From: Sky2high@aol.com X-Original-Message-ID: X-Original-Date: Sat, 15 Dec 2007 15:34:27 EST Subject: Assisting atomization X-Original-To: lml@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="-----------------------------1197750867" X-Mailer: AOL 9.0 VR sub 5006 X-Spam-Flag: NO -------------------------------1197750867 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit Walter, et al, This is a response to your noodling about some device to properly feed the injectors with air pressure to assist in atomization. You noted that up to 3" Hg (1.5 psi, 41" H2O) would assist atomization - perhaps even optimize it. Of course, when the MAP is 3" less than, uh, possible, we would have most beneficial atomization. On the ground when taxiing, I use 10"-12" MAP whilst the surrounding air pressure is 29"+, there is too much pressure. Lowering the speed (IAS) to enter the traffic pattern or whilst on approach, I need a MAP of 13" to 17", still too much pressure difference. However, hi speed cruising at 3000-4000 feet whilst retarding the throttle to 25" MAP results in conditions that are almost ideal when utilizing ram air to the injectors. So, the question is, "How to boost that air pressure at higher altitudes?" Do we need a pressure regulator if over boosting the pressure causes no improvement or harm? What about using the filtered output from an existing vacuum pump (with a relief valve, of course)? If you have an all electric airplane, then just using a spare vacuum pump to assist the injection air might be, uh, interesting. If there is an Electronic Ignition, how about using the magneto drive to operate a pump. How about a small dc electric pump (aquarium?)? What about warming the air to cause expansion? After all, I know there are engineers that could carry these simple calculations further: Suppose the bleed holes are .025 in diameter. Suppose there are 6 of them. What CFM requirement is there for an air pump to maintain 1.5+ PSI thru ports with an area totaling .003 square inches? Maybe a diaphragm aquarium pump would work.... Hmmmmmm........ Example: _http://www.fishfarmsupply.ca/lowcost_12v_pump.htm_ (http://www.fishfarmsupply.ca/lowcost_12v_pump.htm) Scott AKA Grayhawk **************************************See AOL's top rated recipes (http://food.aol.com/top-rated-recipes?NCID=aoltop00030000000004) -------------------------------1197750867 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable

Walter, et al,

This is a response to your noodling about some device to properly feed=20= the=20 injectors with air pressure to assist in atomization.

You noted that up to 3" Hg (1.5 psi, 41" H2O) would assist atomiza= tion=20 - perhaps even optimize it. Of course, when the MAP is 3" less than, u= h,=20 possible, we would have most beneficial atomization. On the=20 ground when taxiing, I use 10"-12" MAP whilst the surrounding air=20 pressure is 29"+, there is too much pressure. Lowering the speed (IAS)= to=20 enter the traffic pattern or whilst on approach, I need a MAP of 13" to= =20 17", still too much pressure difference. However, hi speed cruisi= ng=20 at 3000-4000 feet whilst retarding the throttle to 25" MAP results= =20 in conditions that are almost ideal when utilizing ram air to the=20 injectors.

So, the question is, "How to boost that air pressure at higher=20 altitudes?"

Do we need a pressure regulator if over boosting the pressure causes no= =20 improvement or harm?

What about using the filtered output from an existing vacuum=20= pump=20 (with a relief valve, of course)?

If you have an all electric airplane, then just using a=20 spare vacuum pump to assist the injection air might be, uh,=20 interesting.

If there is an Electronic Ignition, how about using the magneto dr= ive=20 to operate a pump.

How about a small dc electric pump (aquarium?)?

What about warming the air to cause expansion?

After all, I know there are engineers that could carry these simple=20 calculations further:

Suppose the bleed holes are .025 in diameter. Suppose there are 6= of=20 them. What CFM requirement is there for an air pump to maintain 1= .5+=20 PSI thru ports with an area totaling .003 square inches? Maybe a=20 diaphragm aquarium pump would work.... Hmmmmmm........

Example: http://www.fishfa= rmsupply.ca/lowcost_12v_pump.htm

Scott AKA Grayhawk

Se= e AOL's top rated recipes and easy ways to stay in shape for winter.

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