Camshaft/crankshaft sense

[Roy]

Edward C. Hernandez wrote:
> 
> Kenton A. Hoover wrote:
> 
> > A second question is, does anyone sense crankshaft and camshaft
> > positioning separately?  This sounds silly, but it would let one sense
> > timing belt/chain failure almost instantly, so one could inhibit plug
> > firing which might save some bent valves.  In theory, you could sense
> > belt/chain wear, but I don't think you'd want to spend the money on
> > that level of precision.
> 
> Ford do it this way, ie, a cam sensor for TDC and crank sensor for
> engine position.
> 
> Ed Hernandez
> Ford Motor Company
> ehernan3 at ed8719.pto.ford.com

without a distributor you must use a cam sensor, the crank sensor gives
you piston positions, the cam sensor indentifies which stroke a
particular piston is on, ie compression or exhaust.