X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from cdptpa-omtalb.mail.rr.com ([75.180.132.120] verified) by logan.com (CommuniGate Pro SMTP 5.1.12) with ESMTP id 2331776 for flyrotary@lancaironline.net; Fri, 14 Sep 2007 22:06:06 -0400 Received-SPF: pass receiver=logan.com; client-ip=75.180.132.120; envelope-from=eanderson@carolina.rr.com Received: from edward2 ([24.74.103.61]) by cdptpa-omta04.mail.rr.com with SMTP id <20070915020530.PIRJ3980.cdptpa-omta04.mail.rr.com@edward2> for ; Sat, 15 Sep 2007 02:05:30 +0000 Message-ID: <001901c7f73d$05b82b50$2402a8c0@edward2> From: "Ed Anderson" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] One for the smart guys Date: Fri, 14 Sep 2007 22:06:26 -0400 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0016_01C7F71B.7E6D52E0" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.3138 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3138 This is a multi-part message in MIME format. ------=_NextPart_000_0016_01C7F71B.7E6D52E0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Ok since it ran well in those rpm ranges before, we can assume its not = related to your pumps, filters or fuel plumbing since the EC2 does not = control those. If you had the auto tune feature and are using a narrow band O2 sensor, = it could be leaning out at the higher rpm due to the Z shape of the = voltage curve. But, I think that would be too subtle. If missing at higher rpm then its either fuel or spark. The higher rpm = mean higher manifold pressure and SAG is worst at high manifold pressure = - so if you changed your spark plugs and it got better, I would bet on = the SAG. I guess another possibility (just guessing) is that your third pair of = injectors were not firing at higher rpm. Another guess, is you never = got around to retuning your fuel map at the higher rpm after the snubber = fix. OK, I give up Ed ----- Original Message -----=20 From: Mark Steitle=20 To: Rotary motors in aircraft=20 Sent: Friday, September 14, 2007 7:54 PM Subject: [FlyRotary] One for the smart guys OK guys, here's one to think about. =20 Problem: Major mis-fire at 6600 - 7000 rpm. Engine runs great up = until it begins mis-firing. This is a 20B running an EC-2 that's been = updated with the latest s/w (as of 9/1/07). This includes the snubber = fix and a modification for the Renesis CAS. Before the snubber upgrade, = the engine ran good in the upper rpm range, but not in the lower rpm = range. After the snubber upgrade & Renesis CAS modification, it ran = great in the lower rpm range, but had a serious mis-fire beginning = around 3800 rpm. An attempt was made to correct the mis-firing problem = by installing a resistor/zener diode circuit in the CAS lead (this = strategy worked for another Renesis flyer). This approach was partially = successful, but only up to the mid 6K range. =20 Multiple phone calls to Tracy resulted in no fix. I think he's hiding = in Colorado so he won't have to take my calls. (I'm kidding, of course.) = =20 Finally, today (after months of struggling) I discovered what was = causing the problem. It now runs great up to 7300 rpm, verified by a = full-power run down the runway. Anyone want to guess as to what the = problem turned out to be? =20 Mark S. ------=_NextPart_000_0016_01C7F71B.7E6D52E0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Ok since it ran well in those rpm ranges before, = we can=20 assume its not related to your pumps, filters or fuel plumbing since the = EC2=20 does not control those.

If you had the auto tune feature and are using a = narrow=20 band O2 sensor, it could be leaning out at the higher rpm due to the Z = shape of=20 the voltage curve. But, I think that would be too = subtle.

If missing at higher rpm then its either fuel or = spark. The higher rpm mean higher manifold pressure and SAG is = worst at=20 high manifold pressure - so if you changed your spark plugs and it got = better, I=20 would bet on the SAG.

I guess another possibility (just guessing) is = that your=20 third pair of injectors were not firing at higher rpm. Another = guess, is=20 you never got around to retuning your fuel map at the higher rpm after = the=20 snubber fix.

OK, I give up

----- Original Message -----
From:=20 Mark = Steitle=20
To: Rotary motors in = aircraft

Sent: Friday, September 14, = 2007 7:54=20 PM

Subject: [FlyRotary] One for = the smart=20 guys

OK guys, here's one to think about.

Problem: Major mis-fire at 6600 - 7000 rpm. Engine = runs great=20 up until it begins mis-firing. This is a 20B running an EC-2 = that's been=20 updated with the latest s/w (as of 9/1/07). This includes the = snubber=20 fix and a modification for the Renesis CAS. Before the snubber = upgrade,=20 the engine ran good in the upper rpm range, but not in = the=20 lower rpm range. After the snubber upgrade & Renesis = CAS=20 modification, it ran great in the lower rpm range, but had a=20 serious mis-fire beginning around 3800 rpm. An attempt = was=20 made to correct the mis-firing problem by installing a resistor/zener = diode=20 circuit in the CAS lead (this strategy worked for another Renesis=20 flyer). This approach was partially successful, but only up to = the mid=20 6K range.

Multiple phone calls to Tracy resulted in no fix. I think = he's=20 hiding in Colorado so he won't have to take my calls. (I'm kidding, of = course.)

Finally, today (after months of struggling) I discovered what was = causing=20 the problem. It now runs great up to 7300 rpm, verified by a = full-power=20 run down the runway. Anyone want to guess as to what the problem = turned=20 out to be?

Mark S.

------=_NextPart_000_0016_01C7F71B.7E6D52E0--