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I want to thank everyone for their suggestions. Too many possibilities
:)<br>
First thing I did was to change the liner and the exhaust. Replaced
tank internals. Decided to run it on the ground at home and save a
trip to the field.<br>
After 5 minutes or so flying issue was reproduced. Motor started
surging and would not go to full throttle from idle. Needle valve
setting didn't seem to matter. Switch to 30% heli fuel no difference.<br>
Changed both check valves no change. Took the motor out again swapped
the original liner back in and checked the regulator. <br>
-Bingo the edges of the silicone diaphragm are frayed. Replaced the
entire regulator unit with one from an un-run 120AC (thanks Norm S.)
figured that had to be the cause.<br>
No change still surging and no power after heating up. The motor still
turns free, no binding so although I will try a different piston and
front bearing I do not believe that to be the issue.<br>
APC 14x12 used for all of today's tests.<br>
I think I will put a well used but last time ran fine 120 in it and try
to diagnose this motor on the test stand. I'll see if the same issue
crops up with a different motor.<br>
<br>
Stuart C.<br>
<br>
William C. Harden wrote:
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<p class="MsoNormal"><font color="navy" face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial; color: navy;">I ran an APC
15 X 10 on my YS120 AC engine
with 30% nitro (Cool Power). <o:p></o:p></span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial; color: navy;"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial; color: navy;">Bill<o:p></o:p></span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial; color: navy;"><o:p> </o:p></span></font></p>
<div>
<div class="MsoNormal" style="text-align: center;" align="center"><font
color="black" face="Times New Roman" size="3"><span
style="font-size: 12pt; color: windowtext;">
<hr tabindex="-1" align="center" size="2" width="100%"></span></font></div>
<p class="MsoNormal"><b><font color="black" face="Tahoma" size="2"><span
style="font-size: 10pt; font-family: Tahoma; color: windowtext; font-weight: bold;">From:</span></font></b><font
color="black" face="Tahoma" size="2"><span
style="font-size: 10pt; font-family: Tahoma; color: windowtext;">
<a class="moz-txt-link-abbreviated" href="mailto:nsrca-discussion-bounces@lists.nsrca.org">nsrca-discussion-bounces@lists.nsrca.org</a>
[<a class="moz-txt-link-freetext" href="mailto:nsrca-discussion-bounces@lists.nsrca.org">mailto:nsrca-discussion-bounces@lists.nsrca.org</a>] <b><span
style="font-weight: bold;">On Behalf Of </span></b>Stuart Chale<br>
<b><span style="font-weight: bold;">Sent:</span></b> Sunday, July 13,
2008 9:52
PM<br>
<b><span style="font-weight: bold;">To:</span></b> <st1:PersonName
w:st="on">General pattern discussion</st1:PersonName><br>
<b><span style="font-weight: bold;">Subject:</span></b> Re:
[NSRCA-discussion]
120 AC issues</span></font><font color="black"><span
style="color: windowtext;"><o:p></o:p></span></font></p>
</div>
<p class="MsoNormal"><font color="black" face="Times New Roman"
size="3"><span style="font-size: 12pt;"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font color="black" face="Times New Roman"
size="3"><span style="font-size: 12pt;">Various props from 13.5x14 to
15x8<br>
I would think the 13.5x14 would be under propped so shouldn't have been
an
issue.<br>
Stuart<br>
<br>
Paul LaChance wrote: <o:p></o:p></span></font></p>
<div>
<p class="MsoNormal"><font color="black" face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial;">Here is a stupid
question, but what size prop are you
running? Is the engine fully broken in? Just a thought. Had
similar issues with a 170 DZ.</span></font><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><font color="black" face="Times New Roman"
size="3"><span style="font-size: 12pt;"> <o:p></o:p></span></font></p>
</div>
<div>
<p class="MsoNormal"><font color="black" face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial;">Paul</span></font><o:p></o:p></p>
</div>
<blockquote
style="border-style: none none none solid; border-color: -moz-use-text-color -moz-use-text-color -moz-use-text-color black; border-width: medium medium medium 1.5pt; margin: 5pt 0in 5pt 3.75pt; padding: 0in 0in 0in 4pt;">
<div style="font-size-adjust: none; font-stretch: normal;">
<p class="MsoNormal"><font color="black" face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial;">----- Original Message
----- <o:p></o:p></span></font></p>
</div>
<div
style="-moz-background-clip: -moz-initial; -moz-background-origin: -moz-initial; -moz-background-inline-policy: -moz-initial; font-size-adjust: none; font-stretch: normal; background-attachment: scroll;">
<p class="MsoNormal"
style="background: rgb(228, 228, 228) none repeat scroll 0%; -moz-background-clip: -moz-initial; -moz-background-origin: -moz-initial; -moz-background-inline-policy: -moz-initial;"><b><font
color="black" face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial; font-weight: bold;">From:</span></font></b><font
face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial;"> <a
href="mailto:KTHOMPSON56@satx.rr.com" title="KTHOMPSON56@satx.rr.com"
moz-do-not-send="true">Ken Thompson</a> <o:p></o:p></span></font></p>
</div>
<div style="font-size-adjust: none; font-stretch: normal;">
<p class="MsoNormal"><b><font color="black" face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial; font-weight: bold;">To:</span></font></b><font
face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial;"> <a
href="mailto:nsrca-discussion@lists.nsrca.org"
title="nsrca-discussion@lists.nsrca.org" moz-do-not-send="true">General
pattern
discussion</a> <o:p></o:p></span></font></p>
</div>
<div style="font-size-adjust: none; font-stretch: normal;">
<p class="MsoNormal"><b><font color="black" face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial; font-weight: bold;">Sent:</span></font></b><font
face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial;"> Sunday,
July 13, 2008 7:55 PM<o:p></o:p></span></font></p>
</div>
<div style="font-size-adjust: none; font-stretch: normal;">
<p class="MsoNormal"><b><font color="black" face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial; font-weight: bold;">Subject:</span></font></b><font
face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial;"> Re:
[NSRCA-discussion] 120 AC issues<o:p></o:p></span></font></p>
</div>
<div>
<p class="MsoNormal"><font color="black" face="Times New Roman"
size="3"><span style="font-size: 12pt;"><o:p> </o:p></span></font></p>
</div>
<div>
<p class="MsoNormal"><font color="black" face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial;">Stuart, </span></font><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><font color="black" face="Times New Roman"
size="3"><span style="font-size: 12pt;"> <o:p></o:p></span></font></p>
</div>
<div>
<p class="MsoNormal"><font color="black" face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial;">I had the same problem
with a 91AC a few years ago,
like Ron, it turned out to be the front bearing.</span></font><o:p></o:p></p>
</div>
<blockquote
style="border-style: none none none solid; border-color: -moz-use-text-color -moz-use-text-color -moz-use-text-color black; border-width: medium medium medium 1.5pt; margin: 5pt 0in 5pt 3.75pt; padding: 0in 0in 0in 4pt;">
<div style="font-size-adjust: none; font-stretch: normal;">
<p class="MsoNormal"><font color="black" face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial;">----- Original Message
----- <o:p></o:p></span></font></p>
</div>
<div
style="-moz-background-clip: -moz-initial; -moz-background-origin: -moz-initial; -moz-background-inline-policy: -moz-initial; font-size-adjust: none; font-stretch: normal; background-attachment: scroll;">
<p class="MsoNormal"
style="background: rgb(228, 228, 228) none repeat scroll 0%; -moz-background-clip: -moz-initial; -moz-background-origin: -moz-initial; -moz-background-inline-policy: -moz-initial;"><b><font
color="black" face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial; font-weight: bold;">From:</span></font></b><font
face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial;"> <a
href="mailto:ronclark51@comcast.net" title="ronclark51@comcast.net"
moz-do-not-send="true">ronclark51@comcast.net</a> <o:p></o:p></span></font></p>
</div>
<div style="font-size-adjust: none; font-stretch: normal;">
<p class="MsoNormal"><b><font color="black" face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial; font-weight: bold;">To:</span></font></b><font
face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial;"> <a
href="mailto:nsrca-discussion@lists.nsrca.org"
title="nsrca-discussion@lists.nsrca.org" moz-do-not-send="true">General
pattern
discussion</a> <o:p></o:p></span></font></p>
</div>
<div style="font-size-adjust: none; font-stretch: normal;">
<p class="MsoNormal"><b><font color="black" face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial; font-weight: bold;">Sent:</span></font></b><font
face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial;"> Sunday,
July 13, 2008 8:46 AM<o:p></o:p></span></font></p>
</div>
<div style="font-size-adjust: none; font-stretch: normal;">
<p class="MsoNormal"><b><font color="black" face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial; font-weight: bold;">Subject:</span></font></b><font
face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial;"> Re:
[NSRCA-discussion] 120 AC issues<o:p></o:p></span></font></p>
</div>
<div>
<p class="MsoNormal"><font color="black" face="Times New Roman"
size="3"><span style="font-size: 12pt;"><o:p> </o:p></span></font></p>
</div>
<div>
<p class="MsoNormal"><font color="black" face="Times New Roman"
size="3"><span style="font-size: 12pt;">Stuart,<o:p></o:p></span></font></p>
</div>
<div>
<p class="MsoNormal"><font color="black" face="Times New Roman"
size="3"><span style="font-size: 12pt;">I've had the same problem
before. It was the front
bearing. The bearing heats up the front of the motor, then the
regulator,
vaporizing the fuel. Better known as vapor lock.<o:p></o:p></span></font></p>
</div>
<div>
<p class="MsoNormal"><font color="black" face="Times New Roman"
size="3"><span style="font-size: 12pt;"> <o:p></o:p></span></font></p>
</div>
<div>
<p class="MsoNormal"><font color="black" face="Times New Roman"
size="3"><span style="font-size: 12pt;">Ron.....................<o:p></o:p></span></font></p>
</div>
<div>
<p class="MsoNormal"><font color="black" face="Times New Roman"
size="3"><span style="font-size: 12pt;"> <o:p></o:p></span></font></p>
</div>
<blockquote
style="border-style: none none none solid; border-color: -moz-use-text-color -moz-use-text-color -moz-use-text-color rgb(16, 16, 255); border-width: medium medium medium 1.5pt; padding: 0in 0in 0in 4pt; margin-left: 3.75pt; margin-top: 5pt; margin-bottom: 5pt;">
<p class="MsoNormal"><font color="black" face="Times New Roman"
size="3"><span style="font-size: 12pt;">-------------- Original
message -------------- <br>
From: Stuart Chale <<a href="mailto:schale@optonline.net"
moz-do-not-send="true">schale@optonline.net</a>> <br>
I wouldn't have thought about the pipe. I should have another.<br>
Thanks,<br>
Stuart<br>
<br>
<a href="mailto:RUDDERCABL@aol.com" moz-do-not-send="true">RUDDERCABL@aol.com</a>
wrote: <o:p></o:p></span></font></p>
<div>
<div>
<p class="MsoNormal"><font id="role_document" color="black"
face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial;">In a message dated
7/12/2008
11:33:24 PM Eastern Daylight Time, <a
href="mailto:schale@optonline.net" moz-do-not-send="true">schale@optonline.net</a>
writes:<o:p></o:p></span></font></p>
</div>
<blockquote
style="border-style: none none none solid; border-color: -moz-use-text-color -moz-use-text-color -moz-use-text-color blue; border-width: medium medium medium 1.5pt; padding: 0in 0in 0in 4pt; margin-left: 3.75pt; margin-top: 5pt; margin-bottom: 5pt;">
<p class="MsoNormal"><font color="black" face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial;">I'll have to pull it a
part again and see if I see
anything with the sleeve.<br>
Anyone else have any thoughts?<br>
Thanks,<br>
Stu<o:p></o:p></span></font></p>
</blockquote>
</div>
<div>
<p class="MsoNormal"><font color="black" face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial;">Sure do.<o:p></o:p></span></font></p>
</div>
<div>
<p class="MsoNormal"><font color="black" face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial;"> <o:p></o:p></span></font></p>
</div>
<div>
<p class="MsoNormal"><font color="black" face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial;">Try a different pipe. I
know a flyer who had this
same problem some years ago, not with an AC though. He tried everything
and the
problem kept hounding him. Turned out that the pipe was plugging up
when it
heated up and restricting the exhuast flow. <o:p></o:p></span></font></p>
</div>
<div>
<p class="MsoNormal"><font color="black" face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial;"> <o:p></o:p></span></font></p>
</div>
<div>
<p class="MsoNormal"><font color="black" face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial;">Robert<o:p></o:p></span></font></p>
</div>
<p class="MsoNormal" style="margin-bottom: 12pt;"><font
color="black" face="Times New Roman" size="3"><span
style="font-size: 12pt;"><br>
<br>
<o:p></o:p></span></font></p>
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<p class="MsoNormal" style="margin-top: 7.5pt;"><font
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last night's hottest shows and the live music scene in your area - <a
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<pre><font color="black" face="Courier New" size="2"><span
style="font-size: 10pt;"><o:p> </o:p></span></font></pre>
<pre><font color="black" face="Courier New" size="2"><span
style="font-size: 10pt;">_______________________________________________<o:p></o:p></span></font></pre>
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<pre><font color="black" face="Courier New" size="2"><span
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<pre wrap=""><font color="black" face="Courier New" size="2"><span
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<pre style="text-align: center;"><font color="black"
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<pre><font color="black" face="Courier New" size="2"><span
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<pre><font color="black" face="Courier New" size="2"><span
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