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Date: Tue, 18 Jan 2005 06:50:35 -0500
Subject: Re: [FlyRotary] Re: New discovery...
From: Bulent Aliev <atlasyts@bellsouth.net>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
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David, I'm thinking more like a small 12V battery only for the avionics bus
protected by an isolator? So the starter won't pull it down, but the battery
will supply initial 12v to the computer. My starter even scrambles the EM2
display if it's on. I'm not so good with electricity, but many of you here
are .
Buly

On 1/18/05 12:26 AM, "David Carter" <dcarter@datarecall.net> wrote:

> Having lurked on the Aeroelectric List for years, 'Lectric Bob & his Z
> diagrams use a "Low Voltage" module (LVM) of some sort that turn on a "low
> valtage light" when alternator fails and voltage drops below "min voltage to
> charge a battery", something like 13.8v, with voltage regulator set for
> something just over 14 v so battery gets charged for sure.
> 
> So, given that "data point", looks like it might be useful for us folks with
> "computer dependent" engines, which need 9v (for this particular ECU), to
> fabricate a second LVM (set for 9.1 or 9.3 v) that turns on a light - or
> voice warning - to tell us "voltage too low to start" (i.e., below ECU
> minimum voltage required to start).  I'd probably put the light close to
> the starter switch.
> 
> David
> ----- Original Message -----
> From: "Bulent Aliev" <atlasyts@bellsouth.net>
> To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
> Sent: Monday, January 17, 2005 10:24 PM
> Subject: [FlyRotary] New discovery...
> 
> 
>> For some time I was so proud my engine would start right away. The last
> time
>> on Friday night I started it few times and everything was fine. Came back
>> this morning and tried to start it again, no joy? For hours I tried
>> everything, plugs, coils injectors, everything was fine. Kept cranking,
>> fired once for a second and died again. Even starting spray didn't do it.
>> The last thing (lunch time) I measured the voltage while cranking and it
> was
>> 9V. Ahaaa! I remembered something about the computer not working below 9V.
>> I hooked the charger and went for a long lunch with the airport bums..Came
>> back in 3 hrs and BINGO! started right away many times.
>> So the moral of the story is (I think?). If you have enough power to crank
>> the engine, does not mean that it will start. The starter pulls down all
> the
>> available juice and the computer takes a break. Any comments?
>> Buly
> 
>