X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from imr-da06.mx.aol.com ([205.188.169.203] verified) by logan.com (CommuniGate Pro SMTP 5.4.0) with ESMTP id 5027458 for flyrotary@lancaironline.net; Tue, 21 Jun 2011 10:39:59 -0400 Received-SPF: pass receiver=logan.com; client-ip=205.188.169.203; envelope-from=Bktrub@aol.com Received: from imo-da01.mx.aol.com (imo-da01.mx.aol.com [205.188.169.199]) by imr-da06.mx.aol.com (8.14.1/8.14.1) with ESMTP id p5LEd5Cs011363 for ; Tue, 21 Jun 2011 10:39:05 -0400 Received: from Bktrub@aol.com by imo-da01.mx.aol.com (mail_out_v42.9.) id q.f79.1314f9af (55914) for ; Tue, 21 Jun 2011 10:39:00 -0400 (EDT) Received: from smtprly-md03.mx.aol.com (smtprly-md03.mx.aol.com [64.12.143.156]) by cia-md07.mx.aol.com (v129.10) with ESMTP id MAILCIAMD071-d4384e00ad019a; Tue, 21 Jun 2011 10:39:00 -0400 Received: from webmail-d091 (webmail-d091.sim.aol.com [205.188.255.2]) by smtprly-md03.mx.aol.com (v129.10) with ESMTP id MAILSMTPRLYMD037-d4384e00ad019a; Tue, 21 Jun 2011 10:38:57 -0400 References: To: flyrotary@lancaironline.net Subject: Re: [FlyRotary] Re: This has got to stop Date: Tue, 21 Jun 2011 10:38:57 -0400 X-AOL-IP: 50.46.146.205 In-Reply-To: X-MB-Message-Source: WebUI MIME-Version: 1.0 From: bktrub@aol.com X-MB-Message-Type: User Content-Type: multipart/alternative; boundary="--------MB_8CDFE3816299356_11B4_B910E_webmail-d091.sysops.aol.com" X-Mailer: AOL Webmail 33867-STANDARD Received: from 50.46.146.205 by webmail-d091.sysops.aol.com (205.188.255.2) with HTTP (WebMailUI); Tue, 21 Jun 2011 10:38:57 -0400 Message-Id: <8CDFE3816200DC6-11B4-54C62@webmail-d091.sysops.aol.com> X-Spam-Flag:NO X-AOL-SENDER: Bktrub@aol.com ----------MB_8CDFE3816299356_11B4_B910E_webmail-d091.sysops.aol.com Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="us-ascii" I am using single lead Chevy LS1 coils. I have to think that my problem is= igntion related. Brian Trubee -----Original Message----- From: WRJJRS@aol.com To: Rotary motors in aircraft Sent: Mon, Jun 20, 2011 11:24 pm Subject: [FlyRotary] Re: This has got to stop In a message dated 6/20/2011 9:19:49 PM Pacific Daylight Time, bktrub@aol.= com writes: =20 Brian, This type of higher rpm roughness usually indicates an ignition problem.= Since you are running Tracy's system I would expect coils to be a possibi= lity. Good coil grounds are important. One of the other things I often que= stion is are you using multi-lead coils? If you are they are usually a flo= ating secondary. The high tension side of the coil uses both spark plugs= to complete the circuit. One of the plugs fires normally, and the other= fires backward. Frequently the backward firing plug will degrade quickly.= If you are running a fine-wire center electrode this will be more aggress= ive. I saw this a lot on motorcycles 4 cylinders always were using the 2= coils with 2 leads each. Something to check. Bill Jepson =20 I'm going to ground my airplane until I get to the bottom of this. I can= tune it on the ground and it will run just fine all the way from idle to= full throttle. I get about 5300 rpm at full throttle at 29 in hg. MP. I= have 12 hours in the air so far but can't get past this issue. Other than= this, the plane is an absolute joy.=20 =20 When I get off the ground, when I go through around 5400 RPM, I start to= get stumbling and engine roughness. At this RPM I am about 18 inches MP.= Just below this point, I am making about 50% power and the engine will ru= n smoothly.=20 =20 I went to another airport and had a lot of roughness on takeoff, but I am= used to it and so continued on my way to my home airport. When I got back= I found out that someone at the other airport wanted to report me to FSDO= because he thought my engine was going to blow up, but he didn't get my= tail number.=20 =20 So, I thought I had it sorted out before I flew today, but it's back to th= e drawing board. I've tried both leaning and enriching the mixture at all= throttle settings, but to no avail. At and above 5400 rpm I start getting= all sorts of roughness so I think that it has to be an ignition issue. My= injector wiring is separated from my coil wiring, but could I be getting= inductance between the different coil wiring? =20 I have a 93 13 BREW normally aspirated, 2.85 RWS redrive, EM2, EC2, 88x 74= CAtto Prop. This is getting to be really frustrating. It's got to be some= thing simple that I'm overlooking. I don't know anyone with an ocilliscope= , and have never used one.=20 =20 Brian Trubee =20 ----------MB_8CDFE3816299356_11B4_B910E_webmail-d091.sysops.aol.com Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset="us-ascii"
I am using single lead Chevy LS1 coils. I have to think that my probl= em is igntion related.
 
Brian Trubee



-----Original Message-----
From: WRJJRS@aol.com
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Sent: Mon, Jun 20, 2011 11:24 pm
Subject: [FlyRotary] Re: This has got to stop

In a message dated 6/20/2011 9:19:49 PM Pacific Daylight Time, bktrub@aol.com writes:
 
Brian,
This type of higher rpm roughness usually indicates an ignition probl= em. Since you are running Tracy's system I would expect coils to be a poss= ibility. Good coil grounds are important. One of the other things I often= question is are you using multi-lead coils? If you are they are usually= a floating secondary. The high tension side of the coil uses both spark= plugs to complete the circuit. One of the plugs fires normally, and the= other fires backward. Frequently the backward firing plug will degrade qu= ickly. If you are running a fine-wire center electrode this will be more= aggressive. I saw this a lot on motorcycles 4 cylinders always were using= the 2 coils with 2 leads each. Something to check.
Bill Jepson
 

I'm going to ground my airplane until I get to the bottom of this. I= can tune it on the ground and it will run just fine all the way from idle= to full throttle. I get about 5300 rpm at full throttle at 29 in hg. MP.= I have 12 hours in the air so far but can't get past this issue. Other th= an this, the plane is an absolute joy.
 
When  I get off the ground, when I go through around 5400 RPM,= I start to get stumbling and engine roughness. At this RPM I am about 18= inches MP. Just below this point, I am making about 50% power and the eng= ine will run smoothly.
 
I went to another airport and had a lot of roughness on takeoff, but= I am used to it and so continued on my way to my home airport. When I got= back I found out that someone at the other airport wanted to report me to= FSDO because he thought my engine was going to blow up, but he didn't get= my tail number.
 
So, I thought I had it sorted out before I flew today, but it's back= to the drawing board. I've tried both leaning and enriching the mixture= at all throttle settings, but to no avail. At and above 5400 rpm I start= getting all sorts of roughness so I think that it has to be an ignition= issue. My injector wiring is separated from my coil wiring, but could I= be getting inductance between the different coil wiring?
 
I have a 93 13 BREW normally aspirated, 2.85 RWS redrive, EM2, EC2,= 88x 74 CAtto Prop. This is getting to be really frustrating. It's got to= be something simple that I'm overlooking. I don't know anyone with an oci= lliscope, and have never used one.
 
Brian Trubee
 
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