On Wed, 5 Feb 2014 11:34:29 -0500, "Jim Wilkins"
wrote:


"PrecisionmachinisT" wrote in
message news:jPGdnXN8R9fn_W_PnZ2dnUVZ_hidnZ2d@scnresearch. com...

"Jim Wilkins" wrote in message
...

It would be 180 degrees off, not 360.

It's not a 2 cycle.

The waste spark system fires two cylinders at every top dead
center. Supposedly the uncompressed hot exhaust gas in one of them
doesn't absorb much of the spark energy.
jsw

http://en.wikipedia.org/wiki/Wasted_spark
"a conventional four-stroke engine, this signal must also observe the
phase of the camshaft relative to the crankshaft, so contact breakers
are normally driven from the camshaft and distributor drive. With a
wasted spark, the crankshaft can be used instead, as the system fires
on both revolutions."

Like a 2-stroke.

jsw

But crank sensor only can't tell if the belt has jumped. Some engines
(don't know about the Saturn) will not fire if the cam sensor and
crank sensor are not timed identically (to prevent damage from running
mis-timed)