flywheel teeth counting (Re: measuring hall output)

[Orin Eman]

>
> Hello everyone,
>
> [The subject is an '88 5kcstq motor, and the goal is to measure the
> hall sensor output window using a DMM, hand turning the motor,
> and using the flywheel teeth to calculate crank position in degrees.]
>
> I counted the teeth between the timing reference pin, and the zero
> ("0") stamped on the flywheel.  I fully expected the number of teeth
> to come out to 62btdc, which is where that pin supposedly is..
>
> I counted the teeth between the timing reference pin, to the "0"
> stamped on the flywheel, and I come up with 35 teeth.  (yesterday
> it counted 36, but today I counted the 200tq one, which is off the
> car and got 35.)
>
> If that pin is at 62btdc, then how come I can't come up with any
> math that will make 35 teeth equal 62 degrees?  Is the zero
> stamping not TDC?

The zero will be at the reference in the window in the bellhousing
at TDC cyl 1.  The timing pin will be at the timing sensor 62 deg BTDC
cyl 1.  These are two different places on the bellhousing, so you cannot
make any assumptions about the number of teeth between the zero
and the timing pin.

Orin.