While we're pestering ole' Gremlin, I'll have to ask:Given the required voltage to jump the spark plug gap is fairly constant at a constant spark plug gap distance and constant cylinder chamber pressure, wouldn't a coil with a larger turn ratio be more likely to successfully create a spark if the combustion chamber pressure increased?I ask because it is my understanding that an increase in the combustion chamber pressure greatly raises the voltage required to create a spark of a fixed distance.This change can occur when going from a partially open throttle to a wide open throttle.
iiia => this has some examples .... http://naca.central.cranfield.ac.uk/reports/1925/naca-report-202.pdfIVa => A complete discussion of this would involve the "smith chart" and transmission (electrical, not mechanical) theory. Please understand the difference between a "High Energy" coil and a "High Voltage" (high turns ratio) coil, they are not the same thing. But, to illustrate ..... the effectiveness (reliability) of ignition is the transfer of energy from the spark to the gaseous environment. If the spark is INTENSE, but, short lived. it can become ineffective.
Please don't confuse Ohms and Turns ..... You are doing a dis-service to your "customers".Another pet peeve ..... People who actually believe higher turns ratio = more voltage at the plug.The voltage at the plug will be what is required to jump the gap. If you keep the same electrode spacing, your plug voltage will stay the same. More turns = more gap in the plug. A valid argument can be made that adding a higher turns ratio coil without opening up the plug electrodes can actually reduce the reliability of ignition (owing to impedance mis-match and reflected energy).
......PS - Finally DURATION of spark - short vs long lived - could affect the performance. Something that was missing in the conversation on spark and spark plugs.