Manufactures Proprietary Terms Champion PowerSport Champion Stainless Steel Plugs EZ Start Conversion Charts Displacement Conversion Chart Heat Range Interchange (NGK-Denso-Champion-Bosch) Center Electrodes Fine wire Tapered Ground Electrodes V-trimmed Angled ground Cut back ground Multi-ground Resistor Types Resistor Inductive resistor Q-type suppressor Resistor Q-type suppressor Precious Metal Types Iridium Platinum Gold palladium Plug Problems Breakage Erosion Lead Erosion Lead Fouling Melting Normal Plug Wear Overheating Shadowing Fouling Bridging Deposits Pre-ignition Flashover Quenching Plug Properties Thread Reach Hex Terminal Seat Center electrode Ground electrode Copper core Diameter Ignition Anachronism Wasted Spark Ignition Radio Frequency Interference RFI Distributorless Ignition System DIS Capacitor Discharged Ignition CDI Resistor Glow Plugs After Glow Manufacturer's Numbering System Champion

Spark jumping from terminal nut to plug shell Flashover is when the voltage sent to the spark plug does not fire between the center and ground electrodes within the combustion chamber. Instead, it shorts between the metal shell and the terminal nut on the plug exterior, causing the engine to misfire. This can occur when the air is highly ionized (such as on a stormy day), or when the insulator is dirty. Champion plug insulators are corrugated to reduce flashover.

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