The Bosch WR7DC+ (often sold as Super Plus) is a copper core automotive spark plug designed for reliable ignition performance in many everyday petrol engines. It combines classic copper core conductivity with Bosch engineering to deliver broader heat range and durability compared with basic plugs.
Key Features:
• Yttrium enhanced copper core center electrode — improves conductivity, heat transfer and resistance to erosion, offering longer life than traditional copper plugs.
• Tapered nickel chromium ground electrode — enhances cold start ignitability and colder weather performance while maintaining durability.
• Resistor built in (~6 kΩ) — suppresses electrical interference with vehicle electronics (radio/ECU).
• Angular 5 rib insulator design — helps prevent flash over misfires by reducing surface arcing along the insulator.
• Nickel plated rolled threads — resist corrosion and make installation/removal easier without seizing.
• Heat range “7” — suited for applications requiring moderate thermal characteristics.
Typical Use:
Reliable general purpose spark plug for petrol engines in cars, motorcycles, small engines and classic vehicles where Bosch WR7DC+ is specified as the correct replacement.
Performance Note:
Bosch’s testing indicates this plug offers up to ~50 % longer service life than older style copper core designs, due to its enhanced materials and construction.
