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 ironport5.liveoakmail.com ([216.110.12.21] verified) by logan.com (CommuniGate Pro SMTP 5.2c1) with ESMTP id 2582688 for lml@lancaironline.net; Sat, 15 Dec 2007 15:47:31 -0500 Received-SPF: none receiver=logan.com; client-ip=216.110.12.21; envelope-from=walter@advancedpilot.com X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: Ao8CAJrLY0dAMf4VZGdsb2JhbACCb40EmBU X-IronPort-AV: E=Sophos;i="4.24,172,1196661600"; d="scan'208,217";a="39729533" Received: from rs5.liveoakhosting.com (HELO secure5.liveoakhosting.com) ([64.49.254.21]) by ironport5.liveoakmail.com with ESMTP; 15 Dec 2007 14:46:48 -0600 Received: (qmail 4827 invoked from network); 15 Dec 2007 14:46:48 -0600 Received: from ip12-197-248-25.networkusa.com (HELO ?10.0.1.4?) (12.197.248.25) by rs5.liveoakhosting.com with (AES128-SHA encrypted) SMTP; 15 Dec 2007 14:46:48 -0600 Mime-Version: 1.0 (Apple Message framework v752.3) In-Reply-To: References: Content-Type: multipart/alternative; boundary=Apple-Mail-1-401073784 X-Original-Message-Id: <3C371D6D-193E-4334-8D37-3BAB7A6FE774@advancedpilot.com> From: Walter Atkinson Subject: Re: [LML] Re: GAMI Injectors - question for Walter X-Original-Date: Sat, 15 Dec 2007 14:46:45 -0600 X-Original-To: "Lancair Mailing List" X-Mailer: Apple Mail (2.752.3) --Apple-Mail-1-401073784 Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset=US-ASCII; delsp=yes; format=flowed I have been at the GAMI flow bench and observed the effects of adding pressurized air to the injector. It is worthwhile and has a significant effect in aiding atomization. It appears from my limited observations that about 3" upper deck pressure above the called-for MP is adequate with the injectors we are using in aviation. The reason TC'd applications run smoother LOP than NA applications will is due to this effect. Walter On Dec 14, 2007, at 3:42 PM, Douglas Brunner wrote: Walter and Others, I have been following this topic with some interest and it has come up before. I have an IO-550N with GAMI injectors and on my first GAMI lean test it appears that the spread between the first and last EGT to peak is about 0.2 gal/hr. In otherwords - pretty darn good. My ram air setup gives about 1.5 inches increase in manifold pressure. I intend to operate LOP at "high" altitudes (high teens mostly) and would like a smooth running engine. Is it the consensus of opinion that using turbo injectors and pressurizing them creates a smoother running engine? Has this been consistently demonstrated? The reason that I ask is that people that I respect have come down on both sides of this issue. Some say that pressurizing the injectors is crucial, others that it makes no difference. At what altitudes and at what settings LOP (20 deg vs 100 deg) do you notice this effect? If you turn off the ram air (but still run LOP) does the engine run more smoothly? Obviously, I can test these issues myself in the future (I am still in Phase 1), but am interested in others experience. D. Brunner N241DB - 25 hours ----- Original Message ----- From: Walter Atkinson To: lml@lancaironline.net Sent: Thursday, December 13, 2007 2:59 PM Subject: [LML] Re: GAMI Injectors - question for Walter Mark: One factor you did not mention is that when using ram air, the pressure in the induction system can be higher than upper deck cooling air flow. This can cause fuel to actually leak out of injectors causing blue staining nearby. Yes, but not if you use the turbo-type injectors. **the improvement in engine smoothness when running LOP in high altitude cruise is DRAMATIC. Due in large part to the better atomization and therefore better vaporization. Walter --Apple-Mail-1-401073784 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=ISO-8859-1 I have been at the GAMI flow bench and observed the effects of adding = pressurized air to the injector. =A0It is worthwhile and has a = significant effect in aiding atomization. =A0It appears from my limited = observations that about 3" upper deck pressure above the called-for MP = is adequate with the injectors we are using in aviation. =A0The reason = TC'd applications run smoother LOP than NA applications will is due to = this effect.

Walter



On Dec 14, = 2007, at 3:42 PM, Douglas Brunner wrote:

Walter and Others,
=A0
I have = been following this topic with some interest=A0and it has come up = before.
=A0
I have = an IO-550N with GAMI injectors and on my first GAMI lean test it appears = that the spread=A0 between the first and last EGT to peak is about 0.2 = gal/hr.=A0 In otherwords -=A0pretty darn=A0good.=A0 My ram air setup = gives about 1.5 inches increase in manifold pressure.=A0I intend to operate LOP at "high" altitudes (high teens = mostly) and would like a smooth running engine.=A0
=A0
Is it the consensus of opinion that using turbo injectors and = pressurizing them creates a smoother running engine?=A0 Has this been = consistently demonstrated?
=A0
The = reason that I ask is that people that I respect have come down on both = sides of this issue.=A0 Some say that pressurizing the injectors is = crucial, others that it makes no difference.=A0
  • At what altitudes and at what settings LOP (20 = deg vs 100 deg)=A0do you notice this effect?
  • If you turn off the ram air (but still run = LOP) does the engine run more smoothly?
Obviously, I can test these issues myself in = the future=A0(I am still in Phase 1), but am interested in others = experience.
=A0
D. = Brunner
N241DB - 25 = hours
----- = Original Message -----
=A0Thursday, = December 13, 2007 2:59 PM
Subject:=A0[LML] Re: GAMI Injectors - = question for Walter

Mark:

One factor you did not mention is that when using ram air, = the pressure in the induction system can be higher than upper deck = cooling air flow.=A0 This can cause fuel to actually leak out of = injectors causing blue staining nearby.

Yes, but not = if you use the turbo-type injectors.


Walter

= --Apple-Mail-1-401073784--