Pipes - Plugging After Long Use - Cleaning?

[Rick Wallace]

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. 

 

-----Original Message-----
From: discussion-request at nsrca.org [mailto:discussion-request at nsrca.org]
On Behalf Of jim ivey
Sent: Thursday, June 19, 2003 11:23 PM
To: discussion
Subject: Re: Pipes - Plugging After Long Use - Cleaning?

 

Brian

 If I remember correctly the Carb cleaners will attack aluminum and
maybe ruin the pipe.

Jim Ivey

 

----- Original Message -----

From: Brian Young

Sent: Thursday, June 19, 2003 10:23 PM

To: discussion at nsrca.org

Subject: Pipes - Plugging After Long Use - Cleaning?

 

I think Ive heard of this before but has anyone ever
experienced a pipe becoming plugged after prolonged
use. This is a Bolly 590 which has been used for three
seasons now. I couldnt figure out why I was down
500-600 rpm, 2 stroke engine is fairly freshly
rebuilt, runs ok, just down on RRRRsss. I finally put
the thing on my test stand and noticed the pipe was
hard to blow through, swapped the pipe with another
one and found 1000 rpm.

Now it turns 17x10N at 8500 on 25% w/ Bolly 565n
Was at 7500 on 25% on the plugged Bolly 590.

Normally I run on 15%, but was curious whether nitro
would pickup the rpm before I figured the pipe must be
restricted.

Is it possible to clean the semi plugged pipe out? Ive
been trying carb cleaner.

=====
Brian Young
Tulsa
b4598070 at yahoo.com
918-745-6046h
918-838-0900w

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