AAh, too many posts, I am confused..
On a wasted spark system, each coil fires every revolution of the engine. Coil 1 and 4 (end of compression and exhuast stroke on CYL 1 and 4) followed by Coil 2 and 3 180 degrees later (end of compression and exhaust on CYL 2 and 3).
In a tspark engine, This is the same. The only difference is the 2nd plug coming from the "Opposite" coil.
In Cylinder 1, Both plugs are firing at the end of the compression stroke and at the end of the exhaust stroke. In a CF2 engine, the spark is being supplied by Coil 1 on the primary spark plug and coil4 on the secondary spark plug. On a CF3 the wasted spark system still applies but both sparks plugs are supplied by 1 coil.
The advantage of the CF2 is you can disconnect coilpack 1 and 2 and the engine will still fire on all cylinders.
I can't be sure why the CF3 is different, however my educated guess would be that the ECU can inteligently tell when is best to "Spark" based on Fuel quality, Air fuel ratio, RPM, Load etc. And sending the spark to multiple cylinders would muck up this calculation.
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