2 Cycle Setup on a Pipe

Don McCullough donald_mccullough at hotmail.com
Wed Mar 31 14:24:42 AKST 2004 

On the Webra--do you screw the pressure adjustment in or out to reduce 
pressure?


----Original Message Follows----
From: Brian Young <b4598070 at yahoo.com>
Reply-To: discussion at nsrca.org
To: discussion at nsrca.org
Subject: RE: 2 Cycle Setup on a Pipe
Date: Wed, 31 Mar 2004 13:38:44 -0800 (PST)

Maybe Dean can discuss this too.

I can tell you on my 1.45s I reduced the fuel pressure
to cure a midrange richness. I know others who did the
same. By doing this I was able to achieve a great
running engine. I may have been skinning the cat the
other way.


--- randy10926 at comcast.net wrote:
 > Man that describe my 145.  It is my second one and
 > still low mileage, but mid range is a problem.
 >
 > Randy
 > > You might still wish to shorten the pipe, be on
 > the lookout for mid-throttle
 > > hysteresis. If you are not flying at mid throttle
 > for most of your level lines,
 > > you might not be looking for this. The symptom is
 > an inconsistent power level
 > > when you pull back or throttle up to the same
 > middle-stick position.
 > > Hope this helps,
 > > 	Dean
 > >
 > > -----Original Message-----
 > > From: Brian Young [mailto:b4598070 at yahoo.com]
 > > Sent: Wednesday, March 31, 2004 4:11 PM
 > > To: discussion at nsrca.org
 > > Subject: RE: 2 Cycle Setup on a Pipe
 > >
 > >
 > > ;)
 > >
 > > I tried this over the past weekend, Ive seen you
 > > mention this before. It didnt richen at all.
 > >
 > > --- Dean Pappas <d.pappas at kodeos.com> wrote:
 > > > Reasonable question!
 > > > The box width, or 5 seconds, or 50,000 miles:
 > > > whichever comes first.
 > > > Did it not richen at all, or just not enough to
 > > > burble?
 > > > I take it that you got out and flew during the
 > last
 > > > hour.
 > > > Dean
 > > >
 > > > -----Original Message-----
 > > > From: Brian Young [mailto:b4598070 at yahoo.com]
 > > > Sent: Wednesday, March 31, 2004 2:37 PM
 > > > To: discussion at nsrca.org
 > > > Subject: RE: 2 Cycle Setup on a Pipe
 > > >
 > > >
 > > > Ok, how long is a long shallow dive at full
 > > > throttle.
 > > > 10 seconds, 30, ......
 > > >
 > > > I did this w/ my 26.5" setup for about 5-10
 > seconds
 > > > and no burble.
 > > >
 > > > --- Dean Pappas <d.pappas at kodeos.com> wrote:
 > > > > Hello Randy and Bob,
 > > > > The pipe length from piston face (the plane of
 > the
 > > > > exhaust port) to the reflector baffle is
 > > > > approximately proportional to the exhaust
 > timing.
 > > > > The suggestion to start by shortening the 160
 > pipe
 > > > > by 0.5" to 1"  Dave gave you is based on this,
 > and
 > > > > his running of both engines. You do not want
 > to
 > > > > shortenn for maximum ground RPM, you want to
 > start
 > > > > long, and fly. After verifying the "correct"
 > > > needle
 > > > > setting, try a long 5-degree full throttle
 > dive.
 > > > If
 > > > > the engine gurgles rich, shorten a bit, and
 > try
 > > > > again. When the engine no longer richens, in
 > the 5
 > > > > degree dive, stop. Any further shortening
 >
 > > > sacrifices
 > > > > flexible running characteristics for only the
 > > > > tiniest real horsepower inprovement.
 > > > > Dean
 > > > >
 > > > > -----Original Message-----
 > > > > From: Brian Young [mailto:b4598070 at yahoo.com]
 > > > > Sent: Wednesday, March 31, 2004 1:55 PM
 > > > > To: discussion at nsrca.org
 > > > > 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
 > > > > > > >
 >
=== message truncated ===


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