Whats the best propeller for my Mercury Racing engine?
Your engine should be propped so that it operates at or near the top end of its recommended rpm range at wide open throttle with a normal boatload (fuel, gear, people, etc.) An engine that does not reach the rated RPM at wide-open-throttle is in an “overpropped” condition, resulting in “lugging the engine.” This high-torque operation puts a tremendous load on the pistons, crankshaft, and bearings in your marine engine. On the other hand, an engine that revs past the recommended RPM will have higher than normal wear and can also be damaged. Propping is not an exact science and may require some trial and error. The maximum RPM your engine can achieve is dictated by propeller pitch. Generally speaking, one inch of propeller pitch equals 150-200RPM. To increase your engine RPM, you should decrease propeller pitch and vice versa. Your local authorized dealer can assist you in choosing the best propeller. Initially, the prop on your boat is selected by the boat manufacturer and/or selling de
