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.

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