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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>I had a similar problem on a Bolly 480 muffler
- after several hundred flights. Acetone / alcohol soaks didn’t seem to
do much good, so I finally took a long ¼ dia drill and drilled 6-8” straight
up the center line through the exhaust end of the muffler. It seemsed to
relieve the obstruction problem, and is still one of the quietest setups at the
field. </span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> </span></font></p>
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<p class=MsoNormal><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma'>-----Original Message-----<br>
<b><span style='font-weight:bold'>From:</span></b> discussion-request@nsrca.org
[mailto:discussion-request@nsrca.org] <b><span style='font-weight:bold'>On
Behalf Of </span></b>jim ivey<br>
<b><span style='font-weight:bold'>Sent:</span></b> Thursday, June 19, 2003
11:23 PM<br>
<b><span style='font-weight:bold'>To:</span></b> discussion<br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: Pipes - Plugging
After Long Use - Cleaning?</span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> </span></font></p>
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<p class=MsoNormal><font size=2 face=Verdana><span style='font-size:10.0pt;
font-family:Verdana'>Brian</span></font></p>
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<p class=MsoNormal><font size=2 face=Verdana><span style='font-size:10.0pt;
font-family:Verdana'> If I remember correctly the Carb cleaners will
attack aluminum and maybe ruin the pipe.</span></font></p>
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<p class=MsoNormal><font size=2 face=Verdana><span style='font-size:10.0pt;
font-family:Verdana'>Jim Ivey</span></font></p>
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<p class=MsoNormal><font size=2 face=Verdana><span style='font-size:10.0pt;
font-family:Verdana'> </span></font></p>
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<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>----- Original Message -----</span></font></p>
</div>
<div>
<p class=MsoNormal style='background:#E4E4E4'><b><font size=2 color=black
face=Arial><span style='font-size:10.0pt;font-family:Arial;color:black;
font-weight:bold'>From:</span></font></b><font size=2 color=black face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:black'> Brian Young</span></font></p>
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<p class=MsoNormal><b><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial;font-weight:bold'>Sent:</span></font></b><font size=2
face=Arial><span style='font-size:10.0pt;font-family:Arial'> Thursday, June 19,
2003 10:23 PM</span></font></p>
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<div>
<p class=MsoNormal><b><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial;font-weight:bold'>To:</span></font></b><font size=2
face=Arial><span style='font-size:10.0pt;font-family:Arial'>
discussion@nsrca.org</span></font></p>
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<div>
<p class=MsoNormal><b><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial;font-weight:bold'>Subject:</span></font></b><font size=2
face=Arial><span style='font-size:10.0pt;font-family:Arial'> Pipes - Plugging
After Long Use - Cleaning?</span></font></p>
</div>
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<p class=MsoNormal><font size=2 face=Verdana><span style='font-size:10.0pt;
font-family:Verdana'> </span></font></p>
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<p class=MsoNormal style='margin-bottom:12.0pt'><font size=2 face=Verdana><span
style='font-size:10.0pt;font-family:Verdana'>I think Ive heard of this before
but has anyone ever<br>
experienced a pipe becoming plugged after prolonged<br>
use. This is a Bolly 590 which has been used for three<br>
seasons now. I couldnt figure out why I was down<br>
500-600 rpm, 2 stroke engine is fairly freshly<br>
rebuilt, runs ok, just down on RRRRsss. I finally put<br>
the thing on my test stand and noticed the pipe was<br>
hard to blow through, swapped the pipe with another<br>
one and found 1000 rpm.<br>
<br>
Now it turns 17x10N at 8500 on 25% w/ Bolly 565n<br>
Was at 7500 on 25% on the plugged Bolly 590.<br>
<br>
Normally I run on 15%, but was curious whether nitro<br>
would pickup the rpm before I figured the pipe must be<br>
restricted.<br>
<br>
Is it possible to clean the semi plugged pipe out? Ive<br>
been trying carb cleaner.<br>
<br>
=====<br>
Brian Young<br>
Tulsa<br>
b4598070@yahoo.com<br>
918-745-6046h<br>
918-838-0900w<br>
<br>
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