At 03:04 PM 10/21/2003, Damon Campbell wrote:
>While the engine is spinning, what would the output of
>the hall effect sender look like on an oscilloscope?
>Then if this pattern could be approximately correlated
>to crank angle, that would be awesome.

On the 1.9l it's a negative-going pulse to ground, starting at about six
volts.  Fast fall time, slow rise time.  Duration around 10 ms at idle,
proportionately less at speed.  Leading edge corresponds to each spark
initiation except when the idle stabilizer is messing with the timing.

I would expect similar electrical characteristics on the 2.1l, but with a
fixed timing relationship to the crank since there's no advance mechanism
in the 2.1l distributor.

david

--
David Beierl - Providence RI USA -- http://pws.prserv.net/synergy/Vanagon/
'84 Westy "Dutiful Passage"
'85 GL "Poor Relation"