Bosch 7992 Spark Plug

Bosch Nickel Spark Plug 7992 Overview

Bosch 7992 is a conventional nickel-copper spark plug built for steady ignition performance and value. It uses a heavy-duty nickel-ytrium center electrode with a copper core, along with a resistor design and ceramic insulator for dependable operation in older performance and passenger vehicles.

This Bosch Nickel line focuses on OE-style replacement spark plugs for applications that call for a standard 4-cycle plug with a flat seat, 14 mm thread diameter, 19 mm reach, and 0.8 mm pre-gap. It is a practical choice for Porsche 911, Porsche 944, Maserati 228i, and Honda Prelude service where the original specification calls for a nickel-copper style plug.

Key Features

• Bosch part number 7992 spark plug for secondary ignition service
• Nickel-ytrium center electrode with copper core for longer service life than basic copper-core designs
• Resistor plug with 6000 ohms resistance for ignition noise control
• Tapered V-profile ground electrode tip for consistent spark exposure
• Flat seat, 14 mm thread diameter, and 19 mm reach
• Ceramic insulator and non-projected insulator type
• Manufacturer heat range 5
• Compatible with 4-cycle engine applications

Detailed Description

Bosch Nickel 7992 is engineered as a conventional replacement spark plug for vehicles that specify a nickel-copper core design. The nickel-ytrium center electrode and copper core help maintain stable ignition performance, while the single ground electrode and tapered V-profile tip support reliable spark delivery under normal operating conditions. For drivers searching for a Bosch 7992 spark plug for Porsche 911, Porsche 944, Maserati 228i, or Honda Prelude service, this plug matches the listed OE-style dimensions and electrical characteristics.

Fitment includes 1969, 1970-1971, 1974-1977, and 1980-1983 Porsche 911; 1989-1991 Porsche 944; 1989-1990 Maserati 228i; and 1983 Honda Prelude. This part cross-references no listed alternate part numbers in the provided data.

Used For

• Replacing worn spark plugs that cause rough idle
• Restoring ignition consistency after misfire symptoms
• Addressing hard-start conditions related to plug wear
• Correcting fouled or eroded plug electrodes
• Maintaining proper combustion in older OE-spec ignition systems

Installation Notes and Tips

Verify the vehicle’s required thread diameter, reach, seat type, and gap before installation. Bosch 7992 is supplied with a 0.8 mm pre-gap, but application-specific service procedures may call for confirmation against the vehicle’s factory specification. Use the listed fitment notes for gap references on Porsche 911, Porsche 944, Maserati 228i, and Honda Prelude applications.

Quality Assurance

Bosch designs this Nickel line to meet or exceed original equipment specifications for nickel-copper core spark plugs. The construction uses a ceramic insulator, resistor design, and nickel-ytrium electrode materials to support consistent ignition performance in the specified applications.