Dale,

    I suspect that you would have to get a different version of the EC2 if
you want to use some sort of back-up trigger.  As best I recall the crank
angle sensor puts out about 12 pulse per rev from one of the two metal (the
one with the many spokes) and another pulse signal at 180deg intervals (the
two spoke wheel).  So the signal to the EC2 from the crank angle sensor is
not a simple one blip pulse to establish timing as you will find with many
flywheel sensors, etc.

  I used to fly with an HALTECH aftermarket EFI system which only required a
simple trigger. I triggered it off the ignition coils with a switch whereby
I could switch the signal source from Lead to Trail or vice versa.  I much
prefer Tracys use of the crankangle sensor.  With only a spinning metal
wheel and a coil of wire the most likely failure is if you connection comes
undone.  I have never heard of one failing although there must have been
some failures - just never heard of one on a car or otherwise.

Ed

Ed Anderson
RV-6A N494BW Rotary Powered
Matthews, NC
----- Original Message -----
From: "Dale Rogers" <rogersda@cox.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Thursday, July 22, 2004 6:31 PM
Subject: [FlyRotary] EC2 - timing


> Hi All,
>
>    A small flurry of comments on Electronic vs. magneto
> ignition sparked a question in my mind.  What are users
> of Tracy's controller doing for an backup timing pulse
> source?  I know, the stock pickup is extremely reliable,
> but I do recall mention of the concern on the RWS site;
> and unless it's been updated recently, I don't remember
> seeing any specific solutions.  Where else is a good
> place to add another pickup - the oil pump?  - the
> flywheel?
>
> Inquiring mind(s) want(s) to know.
>
> Dale R.
> COZY MkIV #1254
> Ch. 4, 5, 22 and 23 in progress
>
>
>
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