<table cellspacing="0" cellpadding="0" border="0" ><tr><td valign="top" style="font: inherit;"><DIV><FONT face=Verdana>Q - Could the high speed needle being so far out have cause the abrupt high speed "flame out"? </FONT></DIV>
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<DIV><FONT face=Verdana>A- Yes, but I have found that the 170 will stop abruptly breaking the spinner so you can tell that you're too rich. I ran my HS needle further out than 2.25 with the 18.1X10 and still got over 8Ks. On the ground the engine shakes violently just before the shut-down.</DIV>
<DIV><BR> <BR>Q-Does switching from a 2 blade from a 4 blade make a difference and why?</DIV>
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<DIV>A-Yes, I think that 4 blade does not provide as much load as the 18.1X10. The 170 seems to get less tolerant of being too rich as you increase the load. I have destroyed 3 spinners...everytime I changed to a higher load prop.</DIV>
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<DIV>Colin</FONT><BR><BR><BR>--- On <B>Fri, 8/21/09, Woodward, Jim (US SSA) <I><jim.woodward@baesystems.com></I></B> wrote:<BR></DIV>
<BLOCKQUOTE style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: rgb(16,16,255) 2px solid"><BR>From: Woodward, Jim (US SSA) <jim.woodward@baesystems.com><BR>Subject: Re: [NSRCA-discussion] YS engine follow up<BR>To: "General pattern discussion" <nsrca-discussion@lists.nsrca.org><BR>Received: Friday, August 21, 2009, 2:58 PM<BR><BR>
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<P class=MsoNormal><SPAN style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri', 'sans-serif'">Hi Mike – did you “pinch” the fuel line to see what the rpms would do?</SPAN></DIV>
<P class=MsoNormal><SPAN style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'Calibri', 'sans-serif'">Jim</SPAN></DIV>
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<P class=MsoNormal><B><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: 'Tahoma', 'sans-serif'">From:</SPAN></B><SPAN style="FONT-SIZE: 10pt; 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</SPAN></DIV></DIV></DIV>
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<P class=MsoNormal style="MARGIN-BOTTOM: 12pt"><SPAN style="FONT-SIZE: 10pt; 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.</SPAN></DIV>
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