Bosch 4431 Spark Plug

Bosch Platinum+4 has the most platinum in the Bosch Platinum plug series.Platinum +4 unique firing technology combines the advantages of surface air gap technology and 4 yttrium enhanced ground electrodes.The fine wire platinum center electrode (which isheat fused into the extended ceramic insulator) reducesthe voltagenecessary to jump the gap as well as reduces quenching.The4 ground electrode design not only provides multiple radial spark pathsbut also the surface air gap designcreates optimal exposure of the air/fuel mixture to the enhanced ignition spark. The yttrium-enhancement of the ground electrodes even further extends plug life.All Bosch Platinum series spark plugs are designed to reach self cleaning temperature faster for quicker starts, smoother acceleration and increased fuel efficiency.

• Electrode gap is factory set which never requires adjustment and ensures ease of installation.
• Four yttrium enhanced ground electrodes provides optimum access to the air/fuel mixture for the most efficient combustion, plus the yttrium alloy ground electrodes reduce gap wear and oxidation for extended performance life.
• More platinum vs. Bosch Platinum plus for smoother acceleration, top fuel economy and maximum engine power.
• Revolutionary surface air gap firing technology featuring multiple spark paths that delivers the longest, most powerful spark for ultimate engine performance.