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Message-ID: <4B082165.2070100@gmail.com>
Date: Sat, 21 Nov 2009 12:20:37 -0500
From: Steve Brooks <cozy4pilot@gmail.com>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] No start
References: <list-3984775@logan.com>
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You may be onto something.  I measured the voltage while cranking, and 
the drop didn't seem to be bad, but if the EC-2 or the ignition coils 
are on the edge voltage wise, that may be enough to cause the issue.  I 
am using an Odyssey  PC680 battery, and in fact, I bought a new one, and 
installed it last night thinking that perhaps there was an issue with 
the battery.  The one I replaced was about three years old.  Same issue 
on the new battery though.

Bobby Hughes suggested that I power the coils, injectors, etc, along 
with the EC-2 on the spare test battery.  I am going to try that after 
lunch, so if that works, it very well be a voltage issue.

Steve

Lynn Hanover wrote:
> Steve,
>
> I removed the battery cable running to the starter, and using a spare
> battery, and a jumper cable for the ground, I cranked the starter with
> this battery, which was isolated from the airplanes electrical system.
> It had good spark on both rotors .... yeah !!!
>
> It still sounds like low battery voltage during cranking.
>  
> There is a minimum voltage below which some components will no longer 
> function. A volt meter on the battery during cranking would give you 
> the actual voltage available to run the electronics. Starters can draw 
> over 100 amps during cranking. Quite a load for a small battery. The 
> race car will start about 4 times on the little garden tractor 
> battery. Then nothing. So we start up with a big group 24 paste 
> battery with an aircraft style plug in cable made of welding wires. 
> That jump battery is in parallel with the tractor battery as well so 
> we charge the racer and the jump battery by leavng the tractor running.
>  
> Lynn E. Hanover