NGK Bulletin - Bi - Hex Spark Plugs

As modern engines become more efficient and compact, engine components such as Spark Plugs are required to become smaller too. NGK have recognised this and assisted by developing Bi - Hex Spark Plugs.

Traditionally, Spark Plugs have been designed with a hexagonal socket style (See below). The Bi - Hex design provides increased strength compared to a traditional hexagonal design, allowing for a more compact spark plug without compromising strength requirements.

Currently there are only the following limited Original Equipment applications suitable for certain Mini Cooper, Cooper S and BMW models:

PLZKBR7A-G
ILZKBR7A-8G
ZKBR7AP-HTU

Bi-hex spark plugs revised

Due to this unique design a specific long reach Spark Plug socket (Bi - Hex) is required. Rytool Specialty Tools Part No. RT9284 is currently available.