Idle

[Rcmaster199 at aol.com]

Same thing is noticed on the TN carb

MattK


> Subj:Re: Idle 
> Date:6/22/2004 8:27:18 AM Eastern Daylight Time
> From:b4598070 at yahoo.com
> Reply-to:discussion at nsrca.org
> To:discussion at nsrca.org
> Sent from the Internet 
> 
> 
> 
> The Webra carb is steel barreled with aluminum case.
> On the ground before takeoff it always comes back to
> idle. If the bottom end is lean after the flight it
> will be spooled up a bit, when the bottom end is
> slightly rich it seems to behave pretty good. This
> is the MC carb.
> 
> 
> --- Nat Penton <natpenton at centurytel.net> wrote:
> > George the increased idle speed is not a result of a
> > fuel supply condition. You can land two minutes
> > after takeoff and still have the problem. It results
> > because the pressure drop in the carb cools the
> > barrell more than the case. This results in a poor
> > seal and the carb looses some ability to controll
> > the airflow. The barrell and the case operate at sub
> > ambient and the barrell is somewhat insulated by the
> > oil film creating greater differential temps. 
> > Insulating the case might keep the differential
> > temps lower. Also a steel barrell / alum case might
> > prove beneficial. I'm running the Perry carb and
> > getting improved performance in the above regard.I
> > think once this problem is solved we can get
> > appreciable braking from the two stroke.
> > Collectively we can find a solution and/also prevail
> > on the manufactures.               Nat Penton

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