Twin coils for extra grunt

[Mike Blakey]

Yes it does work ! But it is not about extra 'grunt' as you call it. You can 
increase the voltage of the spark by widening the gap it has to jump (this can be 
done in the dizzy or with one of those in-line spark boosters, the greater the gap 
the higher the voltage rise from the coil) 

The twin coil idea as used on the Jag gives a lower impedance and higher current 
flow/rate of change, but the main advantage comes from the 'ringing' effect of 
having two coils in parallel, this extends the spark duration, ensuring against 
plug fouling and a good burn. It works well too on low revving over square motors 
with large diameter pistons (100mm+)



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