NGK 4644 Spark Plug

NGK V-Power Spark Plug 4644 Overview

NGK V-Power Spark Plug 4644 is a copper-core, nickel-tipped spark plug built for stable ignition performance and OE-style serviceability. It uses a standard ground electrode design, a flat seat, and a 0.036 pre-gap specification, making it a practical replacement for select Porsche, Aston Martin, and Audi applications.

The V-Power Spark Plug line focuses on consistent spark delivery and dependable operation across a wide range of domestic and import vehicles. Part number 4644, also identified as BKR7E, is part of NGK’s long-running ignition lineup used in applications that call for a 14 mm thread, 5/8 hex, 0.75 reach, and heat range 7.

Key Features

• NGK V-Power Spark Plug, part number 4644 / BKR7E
• Copper center electrode core with nickel center electrode tip
• Nickel ground electrode with standard tip and standard configuration
• 0.036 pre-gap size for specified applications
• 5000 ohm resistance for ignition system compatibility
• Flat seat, 14.00 mm thread diameter, 0.75 reach, 5/8 hex
• Non-removable nut terminal type
• Heat range 7 for applications requiring this specification

Detailed Description

NGK 4644 is an OE-style spark plug engineered around proven materials and dimensions. The copper core supports heat transfer, while the nickel electrode design provides a familiar service profile for routine ignition maintenance. This spark plug is specified for vehicles that require the BKR7E configuration, including select 2004-2005 Porsche 911, 1997-1998 Aston Martin DB7, and several Audi performance models such as the 1991 Audi 200 Quattro, 1992-1994 Audi S4, and 1995-1997 Audi S6.

NGK has a long history as an OE supplier and manufacturer for domestic and import vehicles in North America, with broad coverage across automotive, motorcycle, marine, and small engine applications. This part cross-references Champion 279 and 340 for the same application.

Common Uses

• Replacing worn spark plugs that cause rough idle in Porsche 911 applications
• Restoring ignition consistency in Aston Martin DB7 tune-ups
• Addressing misfire conditions in Audi S4 and Audi S6 service intervals
• Correcting hard-start complaints tied to plug wear or incorrect gap
• Maintaining proper combustion in vehicles specified for BKR7E-style plugs

Installation Notes and Tips

• Verify the vehicle calls for NGK BKR7E / 4644 before installation.
• Check and set the plug gap to the vehicle-specific specification listed in the fitment notes, such as 0.025, 0.030, or 0.032 inches where required.
• Confirm thread diameter, reach, seat type, and hex size match the original plug.
• Use proper torque procedures for the cylinder head material and plug design.
• Inspect ignition wires or coils during service to avoid repeat misfire concerns.

Quality Assurance

NGK manufactures spark plugs to original equipment standards and supports broad vehicle coverage with established North American and global production and distribution resources. Part number 4644 is built to the published specifications for applications that call for this plug design.