All marinized diesel engines can be used with Seafury drives. When high-speed engines are used, for example higher than 3500 rpm at full throttle, deeper gearbox reduction ratios are required to produce the required torque at the propeller. Gasoline engines, piston and rotary, may also be used with Seafury surface drives. These engines offer the advantage of higher power to weight ratio and typically take up less space in the vessel.
Gasoline engines are higher revving and require deeper speed reduction ratios.
Engine selection is always the responsibility of the designer, builder or owner. All Seafury surface drives have an integral exhaust to which the engine exhaust is connected. The exhaust gases are vented outside the boat just ahead of the propeller. The exhaust gases help ventilate the propeller, especially when the boat is accelerating to the planing condition. In most applications, this feature also eliminates the need for a separate exhaust through-hull.