Received-SPF: pass
 receiver=logan.com; client-ip=74.125.92.26; envelope-from=cozy4pilot@gmail.com
DomainKey-Signature: a=rsa-sha1; c=nofws;
        d=gmail.com; s=gamma;
        h=message-id:date:from:user-agent:mime-version:to:subject:references
         :in-reply-to:content-type:content-transfer-encoding;
        b=PXUSGu8YnwgAFRtIbzG5pBC5HklPnwIapibItpi6tv5PdJW2BB9L4YSwoqN3kN3ejf
         cGy+jLPjlyFOu5zRtMIr9w3nxBoJCSWBWkxHRTOHwqb1vz+CwNzvLU1haKplPNR6iI7K
         BlVbeHS/pNsvjbCkjQrj7Kb4+0EMuFYBNSkfU=
Message-ID: <4B0930F0.9030407@gmail.com>
Date: Sun, 22 Nov 2009 07:39:12 -0500
From: Steve Brooks <cozy4pilot@gmail.com>
User-Agent: Thunderbird 2.0.0.23 (Windows/20090812)
MIME-Version: 1.0
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: need sanity check
References: <list-3984957@logan.com>
In-Reply-To: <list-3984957@logan.com>
Content-Type: text/plain; charset=UTF-8; format=flowed
Content-Transfer-Encoding: 7bit

wschertz@comcast.net wrote:
>
> Steve,
>
> You may have a marginal ground between the engine and the battery. 
> When cranking, the starter dumps high current through the marginal 
> ground, and the potential at that point rises, If the EC-2 is grounded 
> through the same ground, then This would look like low voltage to the 
> EC-2 and coils, even if the battery terminal voltage was not drawn 
> down much. I would check all the engine ground connections. A little 
> corrosion could build up and cause this effect.
>
Bill,
I have a large cable that runs from the battery to the engine block, and 
it is just for the starter.  I have another ground cable, 12 gauge, that 
runs from the battery to the  distribution buss for everything else.  
Same thing on the plus side of the battery.  Big cable to the starter, 
and #12 to the distribution buss.

I think that the easiest fix, since I have two batteries, is to power  
all of the engine stuff from the forward battery, and  then  use the aft 
battery just for cranking.  

I still would like to know what has changed though.  You may be right 
about some corrosion or something on a connection, but everything looks 
nice and clean, and all mounted inside the plane.  Something though has 
changed to cause the problem.

Steve


>  
>
> Bill Schertz
>

>
> I had extended the CAS wiring when I replaced the engine, so I decided 
> to reroute the shielded CAS wiring, so that I could eliminate the 
> unshielded wires, which were about 12" long.  Same problem.
>
> I am struggling with what to try next.  This problem started before I 
> swapped the engine, as it was very hard to get started, though for 
> three years prior to that, I had no issues, and it started easily.
>
> Has anyone else seen this type of problem, or have any suggestions ?Re
>
>  
>
> -------------------------------
>