ST 1.20/1.40 noise

[Emory Schroeter]

I'm using a Karl Mueller header and the Bolly 480 pipe. The Bolly 590 works just as well, but is a little longer and heavier and doesn't seem to offer an advantage to the 480. As far as noise goes, last time I checked it, it was around 93-94 db. However, since that time I switched the material I use for the coupler and it seems to be much more quiet. I was using a 2 1/2" piece of silicone tubing and I switched to a 4" piece of the hard Teflon tubing. Maybe the noise has something to do with the length. Also, what RPM's are you turning with what prop? I like the 16.5x12 and it turns around 8300 rpm's. It is a fairly quiet setup.

Emory Schroeter.
  ----- Original Message ----- 
  From: Ben Owen 
  To: discussion at nsrca.org 
  Sent: Tuesday, February 18, 2003 11:35 AM
  Subject: ST 1.20/1.40 noise


  Emory Schroeter has the answer to this one.  What header and muffler did you use on the S.T. 1.40?  Got to reduce the noise (105dB(A) on my practice plane.
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