(He has given his permission
In the simplest of terms a coil is a step up transformer.
I.e it takes 12 volts and turns it into something like 24,000 volts.
It's these sorts of voltages necessary to make a spark jump a gap of 1-2mm (so just think how many volts are in a bolt of lightning !)
How it works is quite indepth physics, but again the simple aspect is you have to sets of electrical windings, the first set which receives the 12v supply would be something like 100 turns of wire over a 1 inch diameter using a relatively low resistance 0.5mm wire, this then leads directly to a second winding of say 1000 turns over a diameter of 2 inches using a 1.5mm medium resistance wire, this then feeds the plugs directly through the HT leads.
Effectively the charge comes into the first set of windings and as it travels along the path to the second larger set of windings where it accumulates before a switch (signal from the pulser) closes the earth circuit (Plugs) the resultant rush of strored charge is released in one go and provides the spark.
(Note to the tech guys, none of these figures are representative of the 900 or any other bike, they're purely to explain how a coil works)
With ZZR coild and Dyna coils etc, you're basically talking higher output voltages say of 36,000 volts, which basically means the spark is more able to jump the gap on the plug and is less likely to be snuffed out by the mixture in the combustion chamber, resulting in a much reliable spark more complete combustion of the mixture and therectically more power, but this may be slightly negated by the increased combustion temperature which comes from more complete combustion (around 60% of the petrol/gas in the combustion chamber is actually there to cool the piston crown rather than explode), which in turn equals more friction, etc etc.
Generally speaking though it's unlikely you'd see a huge difference of a standard set-up with everything working properly.
Now where did I put my anorak........
This post has been edited by The Mex: 02 July 2008 - 03:39 PM
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