Rotor profile. Re: Cam position sensing w/o a cam sensor

[Mos]

On Mon, 17 Dec 2001, Craig Dotson wrote:

> On your F4i, you can see through the access hole in the sidecover that the
> crank trigger is a 12 tooth wheel.  Nine of the 12 are straight teeth, while
> three have "shoulders" of sorts.  The shouldered crank teeth align with the
> crank sensor at approximately the same time as the cam teeth align with the
> cam sensor (at least to my uncalibrated eye).

What effect does the shouldered tooth have?
I have never looked at the waveform off one of those, but I'm thinking the
difference in waveform is detectable, giving the ECU more timing
information?

Also, I understand the "normal" teeth produce a waveform with a zero
crossing, and a simple comparator circuit can transform that into a nice
square wave. What effect on the comparator circuit and its output does the
shouldered tooth have? (Yes, I'm being lazy and too time contrained right
now to try it myself...)

Mos.

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