**This is a replay from the old podcast series lost to the internet**
Original upload date: 14/07/2020
What is spark plug gap? It is the measurement between the ground electrode and the centre electrode that the ignition spark arcs between. You can have the most advanced ignition system around but if you do not have the gap between electrodes correct your ignition system will not function correctly.
The gap between electrodes determines quality of the spark and the reliability of firing. The gases between the electrodes form a resistance and this promotes a minimum threshold voltage to arc across. However too small of a gap and the voltage requires is less. Too large of a gap and the voltage required may exceed your ignition system.
In summary a small gap promotes reliability of spark but at the expense of spark voltage and heat. Large gaps promote hotter and fatter sparks but may mis under load.
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