Tuned pipe or muffler with large 2-Strokes?

[Lee Davis]

There are no disadvantages to the types of pipes we use for the Pattern 2
strokes.  The tuned exhaust gives more power and in my experience throttle
response is actually smoother and quicker.  These engines are timed to be
used with pipes, and in the cases of OS/Hatori, ES Design, Asano and our own
Greve, the pipes are configured specifically for Pattern.

This is not to say that 2 stroke pattern engines don't work fine on
mufflers, because they do, but they work even better on appropriate tuned
pipes.

Lee Davis
Piedmont Models
http://www.piedmontmodels.com/



  -----Original Message-----
  From: discussion-request at nsrca.org [mailto:discussion-request at nsrca.org]On
Behalf Of Keith Black
  Sent: Saturday, September 21, 2002 3:51 AM
  To: discussion at nsrca.org
  Subject: Tuned pipe or muffler with large 2-Strokes?


  I'd like to hear some feedback on running tuned pipes vs. mufflers on the
large 2-stroke engines such as the OS 1.40RX, Webra 1.45 and Bully 1.45.

  What I've understood is that these large engines have plenty of power
running just a muffler without a tuned pipe, and by not running a tuned pipe
the throttle response should be smoother and not so "peaky". I'd think the
smoother throttle response would make flying pattern much easier. Certainly
one of the benefits of 4-strokes is the instant throttle response with no
spin-up time. It seems as though using a pipe would just aggravate the
spin-up issue with 2-strokes.

  However, in reading some of the messages lately I see that people are
still running tuned pipes on these engines. For example, under the "Webra
Bragging" thread Matt indicated that he is running a Webra 1.45 with an
OS/Hatori tuned pipe and it flies very well.

  I'd really appreciate hearing everyone's experiences relating to this
issue.

  Thanks,
  Keith Black




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