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Technical Resources

Racing Demands of Spark Plugs

Racing is the ultimate test for a spark plug. See how it stands up.

Diagram of Proper Torquing

Whether a flat or conical seal, accurate tightening torque is critical.

Bosch Designation Codes

Find the key to decipher Bosch Spark Plug designation codes.

Spark Plug Faces

A visual inspection of common spark plug problems with likely causes and suggested remedies.

Spark Plug Gap Illustrations

Make sure you know the proper techniques to widen and close an electrode gap.

Spark Plug Temperature Curves/Heat Range

Learn what it really means when a plug is "hot" or "cold."