Bosch W7DSR Silver Spark Plug 14mm Thread 0.750in Reach

The Bosch W7DSR is a silver spark plug engineered for older European performance cars and motorcycle applications. The silver-enhanced center electrode conducts electricity better than copper or nickel, providing superior performance in high-temperature combustion environments.

Key Features:

• 14mm thread diameter with 1.25mm thread pitch
• 19mm (0.750 inch) reach with gasket seat type
• Pre-gapped at 0.028 inch (0.7mm)
• 13/16 inch (21mm) hex size with removable nut terminal
• Built-in resistor for electrical noise suppression
• Silver center electrode with nickel ground electrode
• Heat range 7 for optimal thermal performance

These Bosch silver spark plugs are specifically engineered for colder racing applications and high-performance driving, particularly those that run at full throttle. They are designed for high performance rather than long life, so expect more frequent replacement compared to standard copper core plugs. Originally used as OE equipment on VW Digifant injected 1.8 liter engines, this plug ensures optimal combustion and limited fouling in performance applications.

Cross-reference numbers include Bosch 0241235689, 73954040110, N1781133, and W01331635797. Sold individually.