PR/EP (Pressure Relief / Engine Protection) Spark Plugs transcend the functions of ordinary spark plugs by incorporating an engine over-pressure relief mechanism. The best-designed and built spark plugs in the world can now offer an additional benefit never before available to the internal combustion engine - pressure relief.

Hydrolock and detonation are very different phenomena; they are explained by clicking the "…facts" buttons to the left. Preventing engine damage from hydrolock and detonation is explained by clicking the "…fix" buttons. Even engine overheating can be readily diagnosed and slowed by the PREP Spark Plug technology.

Thank you for visiting the PREP Spark Plugs website. We hope you'll take our quick survey. This technology will soon be available to prevent catastrophic engine damage to owners and operators of:

• High Performance Automobiles (Turbocharged, Supercharged, Nitrous Oxide Injected)
• Off Road Vehicles (Four Wheel Drive Trucks, SUV's, ATC's, Motorcycles)
• Marine Vehicles (Inboard and Outboard Powered Boats, PWC's)
• Emergency and Military Vehicles (Ambulances, Police Cars, HumVee's)
• Small Engine and Stationary Power (Lawnmowers, Generators, Pumps)
• Cars and Trucks of All Types

You can learn more about PREP Spark Plugs by viewing/printing:

SAE Technical Paper 980118: Hydrostatic Lock and Detonation: Spark Plugs as Pressure Relief Devices