Spark Plugs
To further improve the engine's features, a new type of spark plug is used, from Denso. The designation is "SIP " which means S uper I gnition spark P lug.
An SIP-spark plug has a special design which improves a number of features with a more stable spark. By using a special alloy for both the center and side electrode, these can have a smaller diameter than normally. The smaller diameter of the electrodes minimizes heat losses during the flame build process, concentrates the electric field, and gives a stronger spark. The stronger spark gives higher engine power, improved fuel economy, better cold-cranking performance, and longer service life. It is the same spark plug for all versions of engine B63x4x, and can also be used for older versions. Electrode gap is 1.0 mm.