Manuals through 2025 now available!
Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.
LEMON is the spiritual successor to CHARM, I recommend you try it!
Link:
lemon-manuals.la or
lemon-manuals.org.ua
(Some people have issue connecting. LEMON is investigating. For now, use Firefox or change your DNS server)
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Spark Plug: Description and Operation
PURPOSE Spark plugs provide the path for secondary ignition system high voltage to flow to ground.
OPERATION Voltage arcing between plug center and ground electrode produces the spark to ignite the
air/fuel mixture.
CONSTRUCTION Many
spark plugs are made with an internal resistor, designed to reduce ignition system electrical interference with entertainment systems and computerized devices.