One of the major factors that affect the engine’s life is the correct propping.

Once we find the type of propeller that finally matches our boat-engine combination, the next step is to choose the appropriate pitch which will allow the engine to reach its maximum rated rpm.

If we choose a propeller of too short pitch (underpropping) our engine will over-rev, which will have direct impact on the valves and crankshaft operation. However, we face the same risk if we choose a propeller of too long pitch which will not allow the engine to operate at its intended limit of rpm at WOT and can finally cause major damage.