NGK 6612 Spark Plug

NGK BR8ET Spark Plug for Mazda RX-7

The NGK BR8ET spark plug is a standard replacement ignition component built for consistent firing and dependable secondary ignition performance. It is listed for the 1980 Mazda RX-7 and uses a copper center electrode with nickel tip materials for stable conductivity and everyday drivability.

As part of the NGK Standard Spark Plug line, this plug reflects NGK’s OE-focused manufacturing approach for domestic and import applications. The BR8ET part number 6612 is a direct reference for buyers searching for an NGK BR8ET spark plug for 1980 Mazda RX-7 ignition service.

Key Features

• NGK Standard Spark Plug, part number 6612
• Fits 1980 Mazda RX-7, N/A
• Resistance: 5000 ohms
• Copper center electrode core for reliable current transfer
• Nickel center electrode tip and nickel ground electrode tip
• Standard ground electrode design with 3 ground electrodes
• Pre-gap size: .042 in.
• Heat range 8 for specified engine applications
• 14 mm thread diameter, .75 in. reach, flat seat
• 13/16 in. hex size with non-removable nut terminal

Detailed Description

NGK part number 6612, also identified as BR8ET, is a standard spark plug engineered to match the ignition requirements of the listed Mazda RX-7 application. The copper core and nickel electrode construction support consistent spark delivery, while the 5000-ohm resistance helps manage electrical noise in the ignition system. With a .042 in. pre-gap, 14 mm thread diameter, .75 in. reach, and flat seat, this plug is specified for direct replacement use where the OE-style dimensions match.

NGK is a long-established OE supplier with broad coverage across automotive, motorcycle, marine, and small engine applications. For shoppers comparing NGK BR8ET 6612 ignition parts, this plug is a straightforward choice for maintaining the original spark plug specification on the 1980 Mazda RX-7.

Common Issues This Part Can Address

• Hard starting caused by worn or fouled spark plugs
• Rough idle from inconsistent spark output
• Misfire conditions related to degraded electrode surfaces
• Reduced throttle response from weak ignition performance
• Service replacement for a plug matching the OE heat range and dimensions

Installation Notes and Tips

Verify the engine specification and plug gap before installation. The listed pre-gap is .042 in., and the fitment note for the 1980 Mazda RX-7 references a 0.040 in. gap for OE manufacturer requirements. Confirm the seat type, reach, thread diameter, and hex size match the cylinder head before tightening. Use proper spark plug service procedures to avoid cross-threading and to ensure correct torque.

Quality Assurance

NGK manufactures spark plugs to OE standards and supplies a wide range of domestic and import vehicle applications. The BR8ET 6612 is built with the brand’s established focus on durability, consistent performance, and application-specific fitment for ignition service.