Pipes - Plugging After Long Use - Cleaning?

[Adam Glatt]

Rick, I don't remember which Bolly muffler it was (the engine was a ST2300), but mine also became very hard to blow through and the engine wasn't really running (never did really run, though... it was soon replaced by a 140RX).  Took a foot long 1/4" drill bit, and drilled multiple holes as far as the bit would go in from both ends. Fixed the restriction problem.  Also my last Bolly muffler.

  ----- Original Message ----- 
  From: Rick Wallace 
  To: discussion at nsrca.org 
  Sent: June 20, 2003 3:26 AM
  Subject: RE: Pipes - Plugging After Long Use - Cleaning?


  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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