The Doctors Step-By-Step Guide To
OPTIMIZING YOUR IGNITION
By Dr. Christopher A Jacobs, PhD., E.E.
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Here is a basic explaination:
1. The ideal position of the plug is such that the gap is facing towards the valves, preferably the exhaust valve.
2. The object of indexing is to avoid this problem: when this plug fires the spark is directed towards the chamber wall, rather than the center of the combustion chamber.