ST 1.20/1.40 noise

[wgalligan]

I run 15% Ritches Brew 17X10N APC at 8400prm.  Seems to run best on this prop as it spools up a little better but the dowlines suffer somewhat.  
Karl's headers are the best I have seen.  What are we going to do when he stops producing them?

Wayne

> 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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