ST 1.20/1.40 noise

[phelps15 at comcast.net]

where can Karl's headers be found?
Thanks.
Bill

----- Original Message -----
From: "wgalligan" <wgalligan at cnbcom.net>
To: <discussion at nsrca.org>
Sent: Tuesday, February 18, 2003 7:07 PM
Subject: Re: ST 1.20/1.40 noise


> 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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