Any thoughts about a Toyota 4AGE 20 valve engine, that fires a coil-on-plug ignition system, ALL AT THE SAME TIME? I'm not referring to an alternating "wasted spark" system, that fires two-and-two, but one that all four at the same timing point. The coil/plugs are in parallel with the igniter. A pair will always be firing at the start of the intake stroke. These guys swear its an operating concept, no loss of power, normal throttle response, ect.

http://forums.club4ag.com/zerothread?id=18900&page=6

about 1/4 way down the page, there is a schematic.

please don't shoot the messenger, I am seeking understanding.

There is certainly no advantage to doing it that way, and surely it's a recipe for backfiring through the intake system. Just because something can be done, doesn't mean you should.

looking at the second drawing all cylinders will fire together so nominly every tdc and bdc which means it will attempt to fire the cylinder @ bdc of the induction stroke.which will cause a big bang through the inlet
an ingition amplifier desgined to run 1 coil could not run four for very long.

After looking at the original forum this idea came from I don't think there is any point in saying that it doesn't work; will shoot fire out the intake etc. - it does work.
 Why doesn't the wrongly timed spark ignite the mixture?
 Maybe the petrol/air mixture at normal pressure and temperature cannot be ignited by a spark. Several years ago I attempted to make a heating torch by attaching a carby to the intake side of an old compressor and ran a hose from the outlet - there was no way in the world the mixture coming out would ignite. The mixture appeared to be far too lean to burn - it didn't even smell "petrolly".  Quite possibly the mixture needs to be made much denser and heated to 100/150 degrees C (as it is at the end of the compression stroke) before a spark will ignite it/plug valves.
  Also, with a conventional crank-fired "wasted spark" system the spark that occurs towards the end of the exhaust stroke also occurs when air/fuel mixture is flowing into the cylinder and is exposed to the spark - but it does not ignite. This is a very interesting question that shouldn't have mostly been dismissed as "It doesn't work".

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