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To: flyrotary@lancaironline.net
Subject: This has got to stop
Date: Tue, 21 Jun 2011 00:19:00 -0400
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From: bktrub@aol.com
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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


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<div style=3D"FONT-FAMILY: times new roman, new york, times, serif; FONT-S=
IZE: 12pt">

<div>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. </div>


<div>&nbsp;</div>


<div>When&nbsp; 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. </div>


<div>&nbsp;</div>


<div>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. </div>


<div>&nbsp;</div>


<div>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?</div>


<div>&nbsp;</div>


<div>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. </div>


<div>&nbsp;</div>


<div>Brian Trubee</div>
</div>
<br>


<div style=3D"CLEAR: both"></div>
</font>

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