Mailing List flyrotary@lancaironline.net Message #35159
From: Tracy Crook <lors01@msn.com>
Subject: Re: [FlyRotary] Re: engine surging at low manifold pressure
Date: Mon, 15 Jan 2007 16:32:16 -0500
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
It is normal for tuning to be different on the ground than when in-flight at low MAP.  There are separate low & high rpm MAP tuning tables in the EC2.  The engine can turn much higher rpm at the same MP while in-flight.  Because of this, some fine tuning MUST be done while in-flight unless you happen to have a dynamometer laying around the house : -)  .
 
Tracy
----- Original Message -----
From: Bob White
Sent: Sunday, January 14, 2007 3:30 PM
Subject: [FlyRotary] Re: engine surging at low manifold pressure

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/

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