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Date: Sun, 01 May 2011 01:25:38 -0400
From: Ernest Christley <echristley@att.net>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: Timing Question for Tracy
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Lehanover@aol.com wrote:
>  
>  
> In a message dated 4/30/2011 10:59:19 A.M. Paraguay Standard Time, 
> echristley@att.net writes:
> 
>     My solution was to place the backup VR sensor 185* on the other side
>     of the trigger wheel.  Since the 2nd rotor fires
>     180 degrees off from the first, all I have to do is switch the plug
>     wires between the rotors, and I have ignition events
>     from independent sources that are placed 5 degrees apart.  The first
>     is controlled by the ECU to modify the advance.
>     The second runs off a separate power source.
> 
>  
> So the object of the second pickup is to troubleshoot the primary pickup?
>  

The extra 5 degrees was to provide for the stock split.  One VR drives the leading plugs, the other drives the trailing, 
  each sensing for a separate EDIS-4 module.

The EDIS-4 provides a pack with four coil taps.  Energy is provided at the center of the coil, and plug wires attach to 
the ends.  The two sets fire 180 degrees apart.  Currently, I have it configure with one coil pack.  Both wires off a 
single coil going to the same rotor, one to leading, one to trailing.

It would be a sweet setup, except that it will start misfiring at around 4000rpm.  It was designed as a wasted spark 
system on a 4-cylinder engine.  In that case, one of the cylinder's receiving a spark is near TDC on the exhaust stroke, 
which means the cylinder is basically empty. Takes more energy to jump the gap in a pressurized cylinder, so having both 
leads trying to fire in the pressurized chamber during the compression stroke leads to misfires.  The solution to that 
is to ground one of the plug wires off of each group. Then the all the power is dropped across a single plug.  The 
second VR, EDIS-4 module and coil pack will be driving the trailing plugs.

> You can mount a pickup and reluctor system on any piece that rotates at 
> crank speed, and have two independent systems you could switch between 
> under power.
>  
> Or, you could have each pickup (two pickups 180 apart and one reluctor), 
> drive its own system and run the front housing from one, and the rear 
> housing from the other. And if you want a CD system on each of those, 
> you could drive one coil for each plug,
> or, one double ended coil for each housing. If you go CD or MSD be sure 
> the coils are compatible.
>  
> Lynn E. Hanover
>  
>  
> 
> 
>