2 Cycle Setup on a Pipe

[Brian Young]

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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