- Fri Feb 28, 2014 10:54 pm
#3310
Reply to the ignition coil topic.
As simon says, to me a coil is similar to a transformer. If 12 volts goes in 1200 volts (100 to 1 ratio)comes out, if 13 volts goes in (more engine revs) 1300 volts comes out. Some coils, high tension leads, spark plug caps and spark plugs can have resistors in to limit the voltage. If you leave the ignition key switched on (engine stopped) and the points are closed then you have a full circuit which could burn the coil out. Some old 12 volt cars had a 6 volt ignition system but when in the starting position the circuit had 12 volts - minus the reduced cranking voltage so around 10 volts.
As simon says, to me a coil is similar to a transformer. If 12 volts goes in 1200 volts (100 to 1 ratio)comes out, if 13 volts goes in (more engine revs) 1300 volts comes out. Some coils, high tension leads, spark plug caps and spark plugs can have resistors in to limit the voltage. If you leave the ignition key switched on (engine stopped) and the points are closed then you have a full circuit which could burn the coil out. Some old 12 volt cars had a 6 volt ignition system but when in the starting position the circuit had 12 volts - minus the reduced cranking voltage so around 10 volts.