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<DIV>Dave, what pipe is the 1100/260? Whose mfg?</DIV>
<DIV> </DIV>
<DIV>MattK</DIV>
<DIV> </DIV>
<DIV>In a message dated 1/7/2005 12:29:01 AM Eastern Standard Time,
DaveL322@comcast.net writes:</DIV>
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<DIV>Ryan,</DIV>
<DIV> </DIV>
<DIV>The Asano setup is designed for the OS140 which has different port timing
than the 145 - the stock setup is about 24" (610 mm) exhaust flange to tuning
baffle.</DIV>
<DIV> </DIV>
<DIV>The recommended tune length from Webra for the 145 using the tuned
muffler (Horizon part # 1100/260, I believe also sold by Piedmont) is 780mm
(30.75"), from the exhaust flange to the flat end of the pipe before the
exhaust stinger. 800m for the 160 - which is interesting because the 160
is a lower timed engine which typically will utilize a shorter tune
length. I believe Webra is specifying these tune lengths for approx 8100
RPM.</DIV>
<DIV> </DIV>
<DIV>I am running the 160s and find that the 1100/260 at 31" ( 787 mm) to
the flat end (24" to the tuning baffle) and the Asano at 23.785" run
similarly at about 7700 RPM.</DIV>
<DIV> </DIV>
<DIV>More RPM = shorter pipe. If the pipe is too short, the main needle
will be sensitive and the midrange will be less linear.</DIV>
<DIV> </DIV>
<DIV>Less RPM = longer pipe. If the pipe is too long, the boost of the
pipe will be limited, and the engine will be very "friendly".</DIV>
<DIV> </DIV>
<DIV>Anywhere between 25-27" should work, best length will depend on prop and
flying style.</DIV>
<DIV><BR>Regards,</DIV>
<DIV> </DIV>
<DIV>Dave</DIV>
<DIV> </DIV>
<DIV>----- Original Message ----- </DIV>
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<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=mailto:Rcmaster199@aol.com
href="mailto:Rcmaster199@aol.com">Rcmaster199@aol.com</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A
title=mailto:discussion@nsrca.org
href="mailto:discussion@nsrca.org">discussion@nsrca.org</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Thursday, January 06, 2005 10:48
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: Webra 1.45 tuning
length?</DIV>
<DIV><BR></DIV><FONT face=Arial color=#000000 size=2>
<DIV>
<DIV>I am still flying the 145 blackhead too. I use the Hatori/os140
pipe with the macs header. The first reflector is set at 24inches from
the plug, straight line. I don't know how the Asano is setup inside so use
the first reflector distance as a good place to start.</DIV>
<DIV> </DIV>
<DIV>MattK</DIV>
<DIV> </DIV>
<DIV>In a message dated 1/6/2005 10:06:30 PM Eastern Standard Time,
Acroman300@aol.com writes:</DIV>
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<DIV>Hello guys,</DIV>
<DIV> </DIV>
<DIV>I would like to know the tuning lengths that you all are running with
the Webra 1.45. I have the blackhead version and am running an Asano pipe.
I was running the flex header combo with it, but it broke and really
didn't seem that it was tuned as well as it could be, as it was a pretuned
system. Any input is greatly appreciated.</DIV>
<DIV> </DIV>
<DIV>Ryan
Smith</DIV></FONT></BLOCKQUOTE></DIV></FONT></BLOCKQUOTE></FONT></BLOCKQUOTE></DIV>
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