X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from fed1rmmtao104.cox.net ([68.230.241.42] verified) by logan.com (CommuniGate Pro SMTP 5.3c3) with ESMTP id 4013048 for flyrotary@lancaironline.net; Wed, 09 Dec 2009 21:23:28 -0500 Received-SPF: none receiver=logan.com; client-ip=68.230.241.42; envelope-from=alventures@cox.net Received: from fed1rmimpo01.cox.net ([70.169.32.71]) by fed1rmmtao104.cox.net (InterMail vM.8.00.01.00 201-2244-105-20090324) with ESMTP id <20091210022252.BCWU15311.fed1rmmtao104.cox.net@fed1rmimpo01.cox.net> for ; Wed, 9 Dec 2009 21:22:52 -0500 Received: from BigAl ([72.192.136.150]) by fed1rmimpo01.cox.net with bizsmtp id FENr1d00D3EsL8g03ENrgD; Wed, 09 Dec 2009 21:22:51 -0500 X-VR-Score: 0.00 X-Authority-Analysis: v=1.1 cv=dPH3qklg8Vic3E1mcpSlAaa4ZLB04ixhaZIb8bf8Di4= c=1 sm=1 a=+xS8pRtGb5GgEi4xmYelzg==:17 a=Ia-xEzejAAAA:8 a=LttHy2J_AAAA:8 a=7g1VtSJxAAAA:8 a=l12PyPZZj1I178dEUgAA:9 a=6xmkv7gyqWDcB9rWFQ4A:7 a=Js0vQLblIeKpDsHACbHbjWjNA5UA:4 a=EzXvWhQp4_cA:10 a=d3l8BGdl2Y-5FXzB7V0A:9 a=4VytDaY8OuCkK_LDEjYA:7 a=iTqhudt56BR5TnUINO7UQytZASIA:4 a=+xS8pRtGb5GgEi4xmYelzg==:117 X-CM-Score: 0.00 From: "Al Gietzen" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] EC2 signals Date: Wed, 9 Dec 2009 18:23:03 -0800 Message-ID: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0000_01CA78FC.A5953030" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6856 Importance: Normal Thread-Index: Acp5H1PH7ADYArw8SmmPShpiIdTqEwAGy7Eg In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.5579 This is a multi-part message in MIME format. ------=_NextPart_000_0000_01CA78FC.A5953030 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Steve; =20 You are to be commended for some very scholarly work, and excellent reporting. There are many hours invested there, as well as expenses for equipment. =20 For nearly 2 years now I have been puzzled by my observation of spark conditions during cranking that are consistent with your findings. = Since my engine has always started, and run well, I didn't have motivation to = pursue the causes. It may also be at least part of the explanation for the inability to get smooth operation below 1200 rpm. =20 Of course my EC2 has been updated since, so I don't know if the behavior = is still the same. =20 Coincidentally, just this past week I have done some further tests of = timing adjustment. You my recall from my dyno report that the timing of my = engine as I received it was way off because of the use of a 12A front cover = (and pointer) on the 20B engine. We set the CAS position based on estimated = TDC by observing the tip seals between the leading and trailing plug holes. During the testing we verified the timing based on a trace from a = pressure transducer in a trailing plug hole; and decided that about -2 steps on = the EC2 it 'looked right'. I've been running that way since (and the 2 = steps retarded may have been a plus as far as starting spark is concerned). =20 Some time back I had varied the timing a couple of steps during static runup; and could not discern a difference, so I left it as is. I = haven't bothered with in-flight variation, partly because I was a bit hesitant = to be changing it during flight. I finally did so at lean cruise conditions, = and found that about 3 more steps retarding made a discernable increase in = rpm (5450 to 5500). So my EC2 is now set at -10 degrees from default. I haven't yet made any further spark checks, or even observed if low idle = is any smoother. =20 I may retard a bit on the CAS, and then do some more observation to see = if there is an 'optimum'. Then set one of the controllers 5 steps retarded = for use in starting. =20 I guess you have now added to Tracy's TTD list to figure out what, if anything, should be done as a result. =20 Al =20 =20 =20 -----Original Message----- From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of sboese Sent: Wednesday, December 09, 2009 2:30 PM To: Rotary motors in aircraft Subject: [FlyRotary] EC2 signals =20 Steve, Al and others who may be interested in EC2 ignition = characteristics, =20 I have added a page to the http://www.rotarycopilot.com/ website which = is an attempt to show why I choose to use a 10 degree retarded mode 8 ignition timing setting. This setting is beneficial for startup and very slow = idle with my EC2's. =20 The previously mentioned download to this information has been removed = from the website's downloads page. Now the information can be viewed = directly without having to download, unzip, and open the html file. With the version of Internet Explorer I have, it is possible to click on = an image from the web site page and download the original if a clearer = image is desired. =20 Steve Boese =20 =20 =20 -- Homepage: http://www.flyrotary.com/ Archive and UnSub: http://mail.lancaironline.net:81/lists/flyrotary/List.html ------=_NextPart_000_0000_01CA78FC.A5953030 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Steve;

 

You are to be commended for some very scholarly = work, and excellent reporting.  There are many hours invested there, as well = as expenses for equipment.

 

For nearly 2 years now I have been puzzled by my observation of spark conditions during cranking that are consistent with = your findings.  Since my engine has always started, and run well, I = didn't have motivation to pursue the causes.  It may also be at least part of = the explanation for the inability to get smooth operation below 1200 = rpm.

 

Of course my EC2 has been updated since, so I = don’t know if the behavior is still the same.

 

Coincidentally, just this past week I have done = some further tests of timing adjustment.  You my recall from my dyno = report that the timing of my engine as I received it was way off because of the = use of a 12A front cover (and pointer) on the 20B engine.  We set the = CAS position based on = estimated TDC by observing the tip seals between the leading and trailing plug holes. =  During the testing we verified the timing based on a trace from a pressure = transducer in a trailing plug hole; and decided that about -2 steps on the EC2 it = 'looked right'.  I've been running that way since (and the 2 steps retarded = may have been a plus as far as starting spark is = concerned).

 

Some time back I had varied the timing a couple of = steps during static runup; and could not discern a difference, so I left it as = is.  I haven’t bothered with in-flight variation, partly because I was = a bit hesitant to be changing it during flight. I finally did so at lean = cruise conditions, and found that about 3 more steps retarding made a = discernable increase in rpm (5450 to 5500).  So my EC2 is now set at -10 = degrees from default.  I haven’t yet made any further spark checks, or = even observed if low idle is any smoother.

 

I may retard a bit on the CAS, and then do some = more observation to see if there is an ‘optimum’.  Then set = one of the controllers 5 steps retarded for use in starting.

 

I guess you have now added to Tracy’s TTD list to = figure out what, if anything, should be done as a result.

 

Al

 

 

 

-----Original Message-----
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On = Behalf Of sboese
Sent: Wednesday, December 09, 2009 2:30 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] EC2 signals

 

Steve, Al and others who may be interested in EC2 ignition = characteristics,

 

I have added a page to the http://www.rotarycopilot.com/ website which is = an

attempt to show why I choose to use a 10 degree retarded mode 8 = ignition

timing setting.  This setting is beneficial for startup and very slow = idle

with my EC2's. 

The previously mentioned download to this information has been removed = from

the website's downloads page.  Now the information can be viewed = directly

without having to download, unzip, and open the html file.

With the version of Internet Explorer I have, it is possible to click on = an

image from the web site page and download the original if a clearer image = is

desired.

 

Steve Boese

   

 

 

--

Homepage:  http://www.flyrotary.com/

Archive and UnSub:   http://mail.lancaironline.net:81/lists/flyrotary/List.html<= /p>

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