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Learning Center

What is a Resistor Spark Plug?

Resistor spark plugs prevent interference with electronic equipment... Read More

Spark Plug Terminal Types

Spark plugs are manufactured with three different terminal configurations... Read More

ISO vs. JIS Spark Plug Heights

What are ISO and JIS plug heights? Read More

Tapered vs. Gasket Seat

Spark plug seats are not interchangeable... Read More

Does a Spark Plugs Hex Size Matter?

A plugs hex size determines the socket required for installation... Read More

How is a Spark Plugs Reach Calculated?

A spark plugs reach is calculated by the length of the threads... Read More

How are Spark Plug Threads Measured?

A spark plugs threads are comprised of three dimensions... Read More

Spark Plug Insulator Design

What is the spark plug insulators purpose? Read More

Bosch Spark Plug Features

Read about the special features of some Bosch spark plugs... Read More

Rolled vs. Cut Threads

A spark plugs manufacturing process affects installation and structural integrity... Read More

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