NGK 4172 Spark Plug

NGK BR8ECS Spark Plug Overview

NGK BR8ECS, part number 4172, is a standard spark plug built for reliable ignition performance in a wide range of domestic and import applications. It uses a copper center electrode core with nickel tip materials and a nickel ground electrode to support consistent spark delivery and stable combustion.

As part of NGK’s Standard Spark Plug line, this plug reflects the brand’s OE-focused approach and long history supplying original equipment and replacement ignition components for automotive, motorcycle, marine, and small engine use. It is a practical choice for drivers searching for an NGK 4172 spark plug for ignition service on vehicles such as Honda Civic and similar applications where the correct heat range and thread specifications matter.

Key Features

• NGK Standard Spark Plug, part number 4172
• BR8ECS configuration with 14 mm thread diameter and .75 in. reach
• Flat seat design for specified cylinder head applications
• Pre-gapped to .032 for installation on matching applications
• Copper center electrode core for dependable conductivity
• Nickel center and ground electrode tip materials
• Single ground electrode with slant configuration and low-angle tip design
• 5,000 ohm resistance for ignition system compatibility
• 13/16 hex size and non-removable nut terminal
• Manufacturer heat range 8

Detailed Description

NGK 4172 is engineered as a standard replacement spark plug for engines that call for the BR8ECS specification. Its copper core helps promote efficient heat transfer, while the nickel electrode materials support steady spark performance under normal operating conditions. The flat seat, 14 mm thread, .75 inch reach, and 13/16 hex size are important fitment details for buyers comparing ignition parts by engine specification.

This spark plug is a direct search match for NGK BR8ECS and NGK 4172, and it is commonly referenced by drivers and technicians looking for ignition service parts for Honda Civic and other vehicles that use this plug specification. This part cross-references AMS Automotive 4172 and 98079-58819 for the same application.

Common Issues This Part Can Help Address

• Hard starting caused by worn or fouled spark plugs
• Rough idle from inconsistent ignition output
• Misfire conditions related to degraded electrode wear
• Poor fuel burn from weak spark delivery
• Reduced throttle response from aging ignition components

Installation Notes and Tips

Verify the engine calls for BR8ECS before installation, including thread diameter, reach, seat type, heat range, and terminal style. Check the gap against the engine specification before use, even though the plug is pre-gapped to .032. Use proper torque procedures and inspect the ignition system, plug wires, and coil components during service to help maintain consistent performance.

Quality Assurance

NGK is a long-established OE supplier and manufacturer with broad coverage across automotive and powersports applications. Its North American and global manufacturing and distribution network supports consistent product availability and OE-oriented production standards for replacement ignition parts.