Autolite AR2594 Spark Plug

Autolite Racing Spark Plug

Autolite AR2594 is a high performance racing non-resistor spark plug built with OE form, fit, and function in mind. It is listed for select Porsche 911 and Mazda RX-7 applications, with fitment notes that call for specific gap settings.

Key Features

• Non-resistor spark plug for racing and performance use.
• Copper center electrode core with nickel-tipped electrodes.
• Tapered ground electrode tip for consistent spark exposure.
• Flat seat, 14.0 mm thread diameter, and 0.750 in reach.
• Stud terminal and ceramic insulator construction.
• Autolite AR2594 is an OE-style replacement spark plug.

Detailed Description

The Autolite AR2594 spark plug is part of the High Performance Racing Non-Resistor Spark Plug line, which focuses on performance-oriented ignition service while retaining OE-style dimensions. The plug uses a copper core center electrode, nickel tip materials, and a standard electrode design to support reliable ignition characteristics in demanding applications. Autolite AR2594 is referenced for 1965-1973 Porsche 911 and 1979-1980 Mazda RX-7 fitments, with application notes that specify gap requirements. This part cross-references Champion Spark Plug 805 and Interchanges 41XL for the same application.

What It Is Used For

• Replacing a worn spark plug that no longer maintains proper ignition performance.
• Addressing misfire, rough idle, or hard-start conditions tied to plug wear.
• Restoring correct spark gap and combustion consistency in listed applications.
• Supporting performance ignition service where a non-resistor plug is specified.

Installation Notes and Tips

Verify the required gap before installation and match the application note for the specific vehicle. Confirm thread diameter, reach, seat type, and terminal style against the existing plug before service. Use the listed fitment notes for Porsche 911 and Mazda RX-7 applications, and follow the vehicle service manual for torque and gap specification.

Quality Assurance

Autolite supplies ignition products to the automotive aftermarket and original equipment manufacturers, and this plug is built to OE form, fit, and function standards.