AccuSpark AC9C

AccuSpark AC9C is a classic triple-ground spark plug intended for a wide range of European and British classic vehicles. It uses a copper core, three ground electrodes and a non-resistor design. AccuSpark lists it as the equivalent of Champion N9YC and NGK BP6ES.

Application / fitment

AccuSpark lists AC9C as the standard road plug for many classic applications, including:

• Aston Martin DB5, DB6 and six-cylinder DBS
• Austin Allegro, Maxi, Metro and classic Mini
• Austin-Healey Sprite 1275
• BMW 1500, 1600/1602, 1800/1802 and 2002
• selected Datsun/Nissan Bluebird, Cedric, Cherry, Gloria, Laurel, Skyline, Sunny, Silvia and Violet
• selected Fiat 124, 128, 130, 131, later 132 and Argenta
• Ford Anglia, Capri OHV 1300/1600, Capri 3000, Cortina OHV 1500/1600, Escort OHV 1100/1300 and Zephyr/Zodiac
• Hillman Imp, Hunter, Husky and Minx 1500/1725
• MG MGB 1800
• Mini 850, 1000, 1100 and 1275
• Morgan 4/4 with Ford OHV engines
• Morris Ital, Marina, Minor 1000 and selected 1100/1300/1800/2200 models
• Reliant Scimitar V6 and early Rebel/Regal
• Sunbeam Rapier V 1725
• Triumph GT6, Herald 13/60, Spitfire 1300, TR5, TR6 and 2.5/2500 PI
• selected Vauxhall Cavalier 1300, Chevette, Cresta, Firenza, Velox/Ventora, Victor/Viscount
• selected Volvo B19/B21/B23 applications

AccuSpark also lists AC9C as a colder or hotter alternative in some other engines. Those applications should not be treated as a direct standard-heat-range replacement without checking the engine manufacturer's plug specification.

Technical information

• manufacturer: AccuSpark
• part number: AC9C
• type: triple-ground spark plug / three ground electrodes
• core: copper
• thread: 14 mm
• resistor: no
• Champion equivalent: N9YC
• NGK equivalent: BP6ES
• configuration: long-reach type corresponding to the BP6ES/N9YC family
• sale unit: 1 piece

Electrode gap and heat range must follow the specification for the specific engine. The multiple-ground design does not replace the need to verify thread, reach and heat range.