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From: "John Downing" <downing.j@sbcglobal.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
References: <list-2105581@logan.com>
Subject: Re: [FlyRotary] Re: Ignition got me out of Rotary Purgatory
Date: Sat, 16 Jun 2007 07:42:25 -0400
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Ernest, while looking through my engine folder this week, I came across a
drawing of a homemade E-shaft trigger, I'll try and scan and post tonight if
anyone is interested, it was designed for Tracy's EC2.  The only knowledge I
have of Electricity is at the age of two I put a hairpin (branded that
sucker into my fingers) in a wall receptacle and made the decision, if I can
see it I don't want anything to do with it.  JohnD
----- Original Message ----- 
From: "Ernest Christley" <echristley@nc.rr.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Friday, June 15, 2007 11:13 PM
Subject: [FlyRotary] Re: Ignition got me out of Rotary Purgatory


> Changing the subject line to make John and the archive buffs happy 8*)
>
> George Lendich wrote:
> > Ernest,
> > I can't remember what the Mazda RX8 timing wheel looks like - might it
> > do the job? I've been looking for mine, I have put it away and now
> > can't find it. Failing that you might get one laser cut.
> > George (down under)
> Dang this airplane building.  I swear it's a curse.
>
> 11:00 at night an I've got half a bottle of Pinot Grigio from North
> Carolina's very own Biltmore Estates in me, but a simple question sends
> me out into the humid night air with a flashlight to fight off
> mosquitoes while I count the teeth on bicycle gears.
>
> The front middle gear on both of the bikes at my house have 34 teeth.
> The Ford EDIS ignition needs 36 (you'd have to grind off one tooth).
> I'll have to check with a bike shop to see what oversized gears look
> like.  They'll give you these things, because they do wear out (my
> official reason for not pedaling mine around more often).  The way they
> wear out makes it so they can't hold onto the chain, and will have no
> effect on what we're using them for.  All we really want to do is throw
> some metal in front of a variable reluctance sensor in a timely manner.
>
> I don't know how many teeth the RX-8 wheel has, but I do know that it
> uses the opposite logic from the missing tooth method.  It uses the
> bridged tooth.  But, heh, I'm a southern redneck, ya' see, and around
> here missing teeth is a tradition!    Course, the missing tooth output
> could be made to look like the bridged tooth output with an inverter and
> shifting the sensor over by half a tooth.
>
> You can test the vr sensor and timing wheel by chucking the wheel in a
> drill press and jigging the sensor next to it.  Attach an o-scope to the
> sensor output.  You'll also be able to tell what the tolerances are on
> the spacing between the vr and the wheel.
>
> --
> Homepage:  http://www.flyrotary.com/
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