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To: flyrotary@lancaironline.net
Subject: Upper end tuning
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Date: Sun, 5 Feb 2012 22:01:11 -0500 (EST)
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I've got just over 20 hours on my plane today, all of the lower- end bugs h=
ave been worked out. Right now I'm having power drop off precipitously righ=
t at 6100 rpm- 22.6 inches of MP and around 70% power according to the EM2.=
 This is around 130-140 mph IAS. The fuel injection Map shows a smooth grap=
h at that point. I thought that there might be a timing issue so I tried ad=
vancing the timing about 2 degrees but that did not change a thing so I set=
 the timing back where it was previously. I am seeing about a 180 f differe=
nce on the two rotors- I went to mode four to try to balance out the egts, =
but I could only effect about a 20 degree change. Rotor 2 consistently show=
s somewhere above 1800 F, which I tend to question. I'll re-check my calibr=
ation.   I have had the injectors cleaned and tested so unless one of them =
got clogged, that should not be an issue. Still, I should pull them and hav=
e them re-checked. I may have an issue with the EGT probes themselves.=20

 Down below 6100 rpm the engine is smooth as silk, but obviously there is a=
n issue above that .=20


Brian Trubee
RV-4  13 BREW


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<font color=3D'black' size=3D'2' face=3D'arial'>
<div>I've got just over 20 hours on my plane today, all of the lower- end b=
ugs have been worked out. Right now I'm having power drop off precipitously=
 right at 6100 rpm- 22.6 inches of MP and around 70% power according to the=
 EM2. This is around 130-140 mph IAS. The fuel injection Map shows a smooth=
 graph at that point. I thought that there might be a timing issue so I tri=
ed advancing the timing about 2 degrees but that did not change a thing so =
I set the timing back where it was previously. I am seeing about a 180 f di=
fference on the two rotors- I went to mode four to try to balance out the e=
gts, but I could only effect about a 20 degree change. Rotor 2 consistently=
 shows somewhere above 1800 F, which I tend to question. I'll re-check my c=
alibration. &nbsp;&nbsp;I have had the injectors cleaned and tested so unle=
ss one of them got clogged, that should not be an issue. Still, I should pu=
ll them and have them re-checked. I may have an issue with the EGT probes t=
hemselves. </div>


<div>&nbsp;</div>


<div>&nbsp;Down below 6100 rpm the engine is smooth as silk, but obviously =
there is an issue above that . </div>


<div>&nbsp;</div>


<div>&nbsp;</div>


<div>Brian Trubee</div>


<div>RV-4&nbsp; 13 BREW</div>


<div>&nbsp;</div>
</font>
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