Technical Resources

Racing Demands of Spark Plugs
Racing is the ultimate test for a spark plug. See how it stands up.

Download as PDF
Spark Plug Faces
A visual inspection of common spark plug problems with likely causes and suggested remedies.

Download as PDF
Diagram of Proper Torquing
Whether a flat or conical seal, accurate tightening torque is critical.

Download as PDF
Spark Plug Gap Illustrations
Make sure you know the proper techniques to widen and close an electrode gap.

Download as PDF
Bosch Designation Codes
Find the key to decipher Bosch Spark Plug designation codes.

Download as PDF
Spark Plug Temperature Curves / Heat Range
Learn what it really means when a plug is "hot" or "cold."

Download as PDF
Frequently Asked Questions Technical Resources Satisfaction Guarantee Professional Technician Warranty