2 Cycle Setup on a Pipe

[Randy]

Thanks.
Randy
----- Original Message ----- 
From: "Lance Van Nostrand" <patterndude at comcast.net>
To: <discussion at nsrca.org>
Sent: Thursday, April 01, 2004 12:32 AM
Subject: Re: 2 Cycle Setup on a Pipe


> Randy,
> If these timing numbers are correct then a first approximation of pipe
> length can be estimated from the pressure wave propagation timing.  Other
> factors are used for fine tuning, but this sets the tuning resonance to a
> multiple of 4.88 inches nominally. This is really an ugly simplification,
> but it puts you in the ballpark. Using this number you could tune the
length
> for 24.4inches (4.88 x 5) or 29.3 inches.  This explains both answers you
> received below.
>
> --Lance
>
> ----- Original Message ----- 
> From: "Brian Young" <b4598070 at yahoo.com>
> To: <discussion at nsrca.org>
> Sent: Wednesday, March 31, 2004 12:55 PM
> Subject: Re: 2 Cycle Setup on a Pipe
>
>
> > Randy Im at 26.5 from the exhaust flange right now.
> > The 1.60 runs fine at this length, but im only getting
> > 7700 rpm on a 17x12 which I think is low.
> >
> > I had suggestions of 27 inches for a target from the
> > 1.45, less about .5"-1" for the 1.60. But on Ed
> > Hartleys website I notice someone running as long as
> > 30".
> >
> > FWIW the exhaust timing I measured on the 1.60 is 140
> > degrees, and on the 1.45 is 147.
> >
> > --- randy10926 at comcast.net wrote:
> > > Does anyone else have the ppe lenght for the Webra
> > > 160?  Hos much change would be need to replace my
> > > 145 with a 160.
> > >
> > > Randy
> > > > Don't know, Randy.  I don't know the timing of the
> > > Webra 160 and no one has
> > > > let me borrow one.  I own the Webra 145, OS140,
> > > Mintor 170 and regularly use
> > > > these in testing.
> > > > --Lance
> > > >
> > > > ----- Original Message ----- 
> > > > From: <randy10926 at comcast.net>
> > > > To: <discussion at nsrca.org>
> > > > Sent: Tuesday, March 30, 2004 3:17 PM
> > > > Subject: Re: 2 Cycle Setup on a Pipe
> > > >
> > > >
> > > > > Is the pipe length for the Webra 160 the same as
> > > for the Webra 145?
> > > > >
> > > > > Randy
> > > > > > Ditch the MC carb during testing and put a
> > > regular 1.45 carb on it.  The
> > > > > > bench mount it.  I have been testing AeroSlave
> > > carbon pipes for a year
> > > > now
> > > > > > and have a great setup for quickly getting
> > > tuning length and rpms.  I
> > > > have a
> > > > > > "trombone" made from two pieces of silicon
> > > coupler with a short length
> > > > of
> > > > > > aluminum header pipe in between. By starting
> > > with everything extended to
> > > > the
> > > > > > extremes and sliding the whole mess together I
> > > can watch a tach and take
> > > > > > readings real time.  Takes about 5 min to get
> > > the numbers and then setup
> > > > the
> > > > > > flying lengths.
> > > > > > --Lance
> > > > > >
> > > > > > ----- Original Message ----- 
> > > > > > From: "Brian Young" <b4598070 at yahoo.com>
> > > > > > To: <discussion at nsrca.org>
> > > > > > Sent: Monday, March 29, 2004 3:16 PM
> > > > > > Subject: 2 Cycle Setup on a Pipe
> > > > > >
> > > > > >
> > > > > > > I have recently been tuning on my exhaust
> > > and have a
> > > > > > > basic understanding but want some more
> > > information.
> > > > > > >
> > > > > > > I have a Webra 1.60 w/ MC carb and a Webra
> > > pipe w/ a
> > > > > > > disk baffle.
> > > > > > >
> > > > > > > Im gradually shortening this pipe setup
> > > hoping to hit
> > > > >
> > > > > > > the correct length. The problem I find with
> > > this setup
> > > > > > > is the MC carb doesnt lend itself to a test
> > > stand
> > > > > > > since the mixture is servo controlled. So I
> > > shorten
> > > > > > > pipe and fly, shorten and fly.
> > > > > > >
> > > > > > > The thing Im most curious about is if you
> > > had a setup
> > > > > > > no one else has how do you determine a close
> > > first
> > > > > > > guess for the pipe length if you want to cut
> > > down the
> > > > > > > trial and error? I had a starting point but
> > > was just
> > > > > > > puzzling over this.
> > > > > > >
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