How about a natural analog spark system?

[smokingwheels]

well in nature and the real world its impossible to heat a ball of air to 2000 degrees and charge it with 20kV then push it at someone.

So shouldnt the spark thats triggers the burning of all that fuel be natural as well not like modern systems,

eg a series of sine wave pluses across the plug,

so rough figures -ve spark then + spark, at 8kh hz for 2-3 mS ?

Would this be better and more natural?

I seem to remember in the 70's that a good set of points would have slightly more topend power than a transistor setup, but the points would change farly quickly with time.

>>>>>>

so have 2 coils with digital control feeding into one point via a Y cable,

one coil turns off for 1/2 cycle then the other turns off for a 1/2 cycle but the two coils would have to be connected oppsite though, and timed accuractly.

I had started to play with this in 2003

the coil that I had starts at a frequency of 8 kHz and goes up to 16 kHz at resonance,

I had a glitch and blew the output tranny in the early stages so thats as far as i got ..

does anyone has the time and the inclnation to try such a thing?

cause ive got enough to do most of the time.

[superfunk]

I do not see how this would be beneficial.

From my understanding, you are trying to mimic the sinusoidal wave of AC electricity to make it more "natural". AC is a very unnatural thing. If you look at electicity occuring in nature, lighting comes to mind first, it tends to be of a DC nature. But this is a moot point.

It would seem to me that delivering a constant voltage to create a spark would be the most effective. Assuming that you have a maximum time in which spark can be delivered. The energy is defined by the area under the time plot of the charge. This is the energy that is being applied to the plug to create a spark. Therefore, the more energy you have, the bigger the spark you get. Assuming that the peak voltages are the same, the area under a DC curve (flat line at the peak voltage) is much higher than that of the sinusoidal AC curve. Now, from what I gather, you want to produce your spark in two stages, one being a positive DC voltage and the other being of negative DC voltage. Theoretically, if you could switch between the positive and negative instantaneously, which is highly unlikely to actually happen, at best you will reproduce the energy created by the constant DC source.

Now as for polarity. All that changing polarity will do is change the direction in which the spark is formed. I am not entirely familiar with some of the intricate details of Internal Cumbustion Engines, but I would bet that the direction of spark will have little effect on the combustion efficiency.

So I guess in short, doing this in my opinion, would create a net effect (I dont see a positive effect) of less spark.

-Adam

[smokingwheels]

thanks Adam

Im guessing, my system would approx double the voltage swing across the plug.

Ive had a look at ION voltage plots which relate to combustion pressure and the cylinder pressure spikes all over the place just after ignition.

I guess im looking to damp that effect down a little in order to run higher compression ratios.

Basicaly there is 3 pressure pluses/phases

1. btdc at ignition, random spikes

2. at tdc flame front

3. atdc this is when the power is extracted

hence 33% of usefull energy 66% waisted

Greg