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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Hi Mike – did you “pinch” the fuel line to see what the rpms
would do?<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Jim<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
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<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>
nsrca-discussion-bounces@lists.nsrca.org
[mailto:nsrca-discussion-bounces@lists.nsrca.org] <b>On Behalf Of </b>Michael
Cohen<br>
<b>Sent:</b> Friday, August 21, 2009 2:52 PM<br>
<b>To:</b> nsrca-discussion@lists.nsrca.org<br>
<b>Subject:</b> [NSRCA-discussion] YS engine follow up<o:p></o:p></span></p>
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<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal style='margin-bottom:12.0pt'><span style='font-size:10.0pt;
font-family:"Verdana","sans-serif"'>Well, I ran the YS engine I had trouble
with the other day and am reporting back with my findings. First, the
inspection and changes. I looked for cracks or splits in the o-rings and
saw none. I went back to flush on the pump (it was about 3/4 of a
turn out). After starting the engine and running on a high mid
throttle and back down to idle, I tweaked the pump slightly to
keep a good 2000 to 2200 idle. I left the high speed set where it was,
but after running at full power, I went to get the tach and the engine
would die abruptly. I decided to check the valve clearance and
reset it to .0015 to .0020 inches. Since the valve cover was off, I
did a quick wet sand on the valve cover. Since I was out 2.25 turn on the
main needle (much further than any other DZ I have), I decided to simply turn
it in to 1.75 turns and see what would happen. I know for a good
controlled experiment, one should not alter more than one thing at a time,
but the engine seemed to work just fine now. High end power was
up to 7400 to 7500 RPM on an 18.1 X 10 prop from the 7200 (but rapidly sagging)
setting before. Richening the high setting slightly cause a slight drop
in RPM, so I left it at 1.75 out and double checked the idle and the
transition from idle to full power. Everything seems to work great, but I
will try it in the air on Sunday before feeling more comfortable.<br>
<br>
In summary, from the previous, issue free running of this engine in a Brio, I
made the following changes:<br>
<br>
1) Had a mid air and buried the engine nicely in a plowed field.<br>
2) Disassembled, inspected, cleaned, and reassembled the engine
(using klotz synthetic oil as a lube) and installed it into an Eclipse<br>
3) Used a 18.1 X 10 2 blade in place of the 15.5 X 12 4 blade<br>
4) Ran the engine on the ground to check its operation, all seemed normal<br>
5) Had one flight on the engine last weekend and on the second
flight, the dying at full power issue popped up. Admittedly, it was
a very humid day last weekend.<br>
6) Reset the pump to flush and checked the idle for a nice 2000-2200
run. The high power setting issue was still present.<br>
7) Reset valve clearance, sanded the valve cover, and reset the high
speed needle to 1.75 turns out. Problem solved!<br>
<br>
So, now for the educational questions:<br>
<br>
Could the high speed needle being so far out have cause the abrupt high speed
"flame out"?<br>
<br>
Does switching from a 2 blade from a 4 blade make a difference and why?<br>
<br>
Does the valve clearance being in the .003 range instead of the .000 to .002
(as recommended) make that much of a difference?<br>
<br>
Could an air leak cause this high speed flame out problem?<br>
<br>
I am interested to know so I can someday become the Troy Newman of the East
(maybe) for YS engines. I don't get a heck of a lot of flights per year,
so my statistical database is lacking. But that said, I did help two
people with their YS engine troubles at the Weak Signals contest so I must be
learning something! Thanks all for the help.<o:p></o:p></span></p>
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