Autolite Copper Resistor Spark Plug

Autolite 4163 is a copper resistor spark plug built with OE form, fit, and function in mind. It uses a copper center electrode, nickel ground electrode components, and a 0.030 in. pre-gap for consistent ignition performance.

Key Features

• Copper center electrode core for responsive ignition performance.
• Nickel ground electrode tip and core materials for durable spark delivery.
• 5000 ohm resistor design helps control electrical noise.
• Mid-projection ceramic insulator with a flat seat and removable nut terminal.
• 12.0 mm thread diameter, 19.5 mm reach, and 11/16 in. hex size.

Detailed Description

Autolite 4163 is a copper resistor spark plug engineered for direct replacement use where the specified heat range, reach, and terminal style match the application. The tapered ground electrode tip and standard center electrode design support stable spark formation, while the nickel electrode materials and ceramic insulator provide a practical OE-style construction. This part cross-references Champion Spark Plug 809 and Interchanges 121XLS, HG22C for the same application. It fits 2004-2005 Porsche 911 and 2011 Porsche 911, making it a direct match for Porsche 911 ignition service when the catalog calls for Autolite 4163.

What It Is Used For

• Replacing a worn spark plug that causes hard starting.
• Restoring smooth acceleration after ignition wear.
• Addressing misfire symptoms tied to plug condition.
• Supporting consistent combustion when fuel economy drops.

Installation Notes and Tips

Verify thread diameter, reach, seat type, and pre-gap before installation. Confirm the application calls for a removable nut terminal and 0.030 in. gap. Use the vehicle service specification for final torque and gap checks. Fits 2004-2005 Porsche 911 and 2011 Porsche 911, so confirm the exact engine application before installation.

Quality Assurance

Autolite supplies spark plugs to the automotive aftermarket and original equipment manufacturers and positions this plug as an OE-style replacement for a wide range of vehicles.