Starter Tooth Sensor Question

[rr]

Why do I keep thinking that a tooth could be lowered enough
to skip the sensor and still work for the starter? Then use a
retriggerable SS to detect the missing tooth.

BobR.

bcroe at juno.com wrote:

> Yes, even if a tooth is a bit battered, it only represents
> a couple of degrees.  Battered or not, it will not be
> moving into the position of an adjacent tooth.  And the
> the shaft runout should be pretty small compared to
> tooth dimensions.
>
> A PIC ought to do it, if it can match the top RPM rate.
> But I won't be knocking a tooth off it, so something
> else will be needed for sync on the flywheel, and a
> second crude sync from the cam/distributor.
>
> The Hall devices I picked for experiments
> (MLX90217) claim to be self adjusting to things
> including gear wear, rise time of .4 microsecond,
> and 15KHZ bandwidth.  That sounds like they could
> do the job.  I understand the OEMs putting a nice
> missing tooth wheel in their engine, but those of
> us trying to upgrade 70s engines just have to make
> do with what we have.
>
> Bruce Roe

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