Autolite 85 Spark Plug

Autolite Copper Resistor Spark Plug Overview

The Autolite Copper Resistor Spark Plug part number 85 is engineered for reliable ignition performance in a variety of vehicles including Buick, Chevrolet, Dodge, and Toyota models. Designed with a copper core and resistor technology, this spark plug supports efficient combustion and reduces electrical interference.

• Resistance rating of 4000 ohms for noise suppression
• Copper center electrode with nickel tip for durability
• Tapered ground electrode tip made of nickel
• Flat seat type with a 14.0 mm thread diameter
• Mid projection ceramic insulator for heat resistance
• Removable nut electrical terminal type for easy installation
• Pre-gap size options of 0.034" and 0.90" for precise tuning
• Hex size options of 13/16" (21 mm) for compatibility with standard tools
• Reach length of 0.374" (9.5 mm) suitable for various engine designs

About the Copper Resistor Spark Plug Line

The Autolite Copper Resistor Spark Plug line combines copper core electrodes with resistor technology to reduce radio frequency interference while maintaining strong spark energy. This product line is designed to provide consistent ignition performance and durability across a wide range of secondary ignition applications. Part number 85 exemplifies these features with its nickel-tipped electrodes and ceramic insulator, making it suitable for many domestic and import vehicles.

Technical Details and Compatibility

This spark plug features a single nickel ground electrode with a tapered tip design to optimize spark exposure and combustion efficiency. The copper center electrode core enhances thermal conductivity, helping to dissipate heat effectively. The flat seat design ensures a secure fit in the cylinder head, while the mid projection ceramic insulator provides electrical insulation and heat resistance. The removable nut terminal type facilitates straightforward electrical connections during installation.

Compatible with a broad range of vehicles, including Buick models like the Century and LeSabre, Chevrolet trucks such as the C10 Suburban and Silverado series, Dodge Chargers, and Toyota Land Cruiser, this spark plug supports various engine configurations requiring a 14.0 mm thread diameter and 0.374" reach.

Applications and Problem Solving

• Reduces ignition system radio frequency interference
• Improves combustion efficiency for smoother engine operation
• Helps prevent misfires caused by electrode wear
• Supports consistent spark delivery in older and high-mileage engines
• Compatible replacement for worn or fouled spark plugs in specified vehicles

Installation Notes and Tips

• Verify correct gap size before installation; adjust if necessary to 0.034" or 0.90" as specified by vehicle manufacturer
• Use a 13/16" (21 mm) spark plug socket for proper torque application
• Ensure threads are clean and apply anti-seize compound if recommended
• Torque spark plug to manufacturer specifications to avoid damage
• Check for proper seating and electrical connection with the removable nut terminal

Quality Assurance and Warranty

Autolite spark plugs are manufactured to meet industry standards for ignition components. The Copper Resistor Spark Plug part number 85 undergoes rigorous quality control to ensure consistent resistance and electrode integrity. While specific warranty details may vary, Autolite products typically come with a limited warranty against manufacturing defects. Consult product documentation or vehicle service guidelines for warranty coverage.