Answer
Jun 12, 2023 - 09:37 PM
Hi Jacob,
The resistance of the coil determines how much current flows through the ignition system. The 3 ohm coils, because of their lower resistance, pass more current and therefore run warmer than the 5 ohm coils. This is most likely to occur under worst case conditions, such as creeping along in traffic on a hot day in Arizona (this isn?t so great for an air cooled engine either!). Rather than get into the specifics of every application we make the general recommendation - 5 ohm for street, 3 ohm for race. Also, please note that this is a Harley recommendation and most 4 cylinder applications with the Dyna S are fine with the 3 ohm coils.
Technical Support
Toll Free: 800-928-3962
The resistance of the coil determines how much current flows through the ignition system. The 3 ohm coils, because of their lower resistance, pass more current and therefore run warmer than the 5 ohm coils. This is most likely to occur under worst case conditions, such as creeping along in traffic on a hot day in Arizona (this isn?t so great for an air cooled engine either!). Rather than get into the specifics of every application we make the general recommendation - 5 ohm for street, 3 ohm for race. Also, please note that this is a Harley recommendation and most 4 cylinder applications with the Dyna S are fine with the 3 ohm coils.
Technical Support
Toll Free: 800-928-3962
