2 Cycle Setup on a Pipe
Lance Van Nostrand
patterndude at comcast.net
Wed Mar 31 20:50:51 AKST 2004
Out to reduce. Don't go far though. If the screw falls out it's very
difficult to reassemble and get it to work right. Don't ask me how I know.
The worst pressure problem I have seen required only 1.5 turns to correct.
Most adjustments are less than one turn.
--Lance
----- Original Message -----
From: "Don McCullough" <donald_mccullough at hotmail.com>
To: <discussion at nsrca.org>
Sent: Wednesday, March 31, 2004 5:24 PM
Subject: RE: 2 Cycle Setup on a Pipe
> 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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