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Date: Sun, 14 Jan 2007 13:30:31 -0700
From: Bob White <rlwhite@comcast.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] engine surging at low manifold pressure
Message-Id: <20070114133031.347a6af1.rlwhite@comcast.net>
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Hi Lou & Paul,

I see surging at low rpm if the mixture gets too lean amd rough running
or missing if it's too rich on my 13B.  Above 3000 rpm or so it runs
real smooth at almost any mixture setting.  Do you have an O2 sensor
to check the mixture?  I tuned the EC2 on the ground but it seems like
the tuning is different when I'm flying.  It seemed to be running richer
in flight.

Bob W.  


On Sun, 14 Jan 2007 11:10:37 -0800 (PST)
lou rubin <grdflyguy@yahoo.com> wrote:

> We have recently tuned the Ec2 on a 20B & although it
> has helped it run a little smoother we still get alot
> of roughness & surging at idle from 15 to 18 inches
> Mp& especially when pulling back power Has anyone
> experienced this problem? The plane has been run on
> the ground, however the problem was just as bad in air
> in a descent. 
> 
> Lou & Paul  N ES 117ES
> 
> 
> 
>  
-- 
N93BD - Rotary Powered BD-4 - http://www.bob-white.com
First Flight:  11/23/2006 7:50AM - 1.7 Hours Total Time
Cables for your rotary installation - http://www.roblinphoto.com/shop/