At 11:33 PM 12/3/2013, James wrote:
>Distributor rotates at half crankshaft speed.... idle is 850 rpm....
>half is 425 rpm... one Hall Effect signal
>per crankshaft rotation ( or is that two per rotation...??).... nah,
>I'd better try to calculate this tomorrow!

One pulse per (piston @  TDC** on firing stroke) so two per
crankshaft revolution.

850 rpm / 60  secs/minute = ~14 rev/second x 2 pulses/rev = ~28 pulses/second.

** Really at the fixed timing advance point which is a few degrees
before TDC on the 2.1l.

Yrs,
d