NGK Racing R2558E-9 spark plug (heat range 9) M12 x 1.25, thread reach 26.50 mm

For: universal

NGK Racing Series plugs are engineered to withstand the harshest engine conditions. Fine wire iridium tipped center electrode and platinum tipped ground electrode improve ignitability, increase durability and enhance anti fouling capabilities. Special insulator nose configurations improve throttle response. Corrugated ribs prevent flashover. Pure alumina silicate ceramic insulator, provides superior strength and better heat transfer. Copper core aids in heat removal. Triple seals prevent leakage.

NGK spark plugs used for racing must withstand especially hard stresses. The speeds during a race are frequently in excess of 15,000 rpm. Temperature, pressure, and vibrations in the combustion chamber are so immense that conventional ground electrodes could break or melt. For this reason, NGK racing spark plugs often come with specially designed ground electrodes. The most extreme form of these plugs come with a ring-shaped ground electrode. The spark jumps from the middle electrode to the ring-shaped ground electrode.