Hydrostatic lock occurs when a volume of liquid greater than the volume of the cylinder minimum (end of the pistons stroke) enters the cylinder. Since most common liquids are incompressible the piston cannot complete its travel; either the engine must stop rotating or a mechanical failure must occur. Diesel engines are more susceptible to hydro lock than gasoline engines. Due to their higher compression ratios, diesel engines have a much smaller final combustion chamber volume, requiring much less liquid to hydro lock. Diesel engines also have higher torque, rotating inertia and