This severe strain can lead to detonation, piston seizure, and engine damage. The mechanical strain on an over-propped marine engine is like starting an automobile in third gear from a dead stop at the bottom of a hill. The engine runs much hotter and may overheat from having over-advanced spark timing for the reduced amount of fuel entering the engine. “An engine that does not reach the rated RPM at wide-open-throttle is an “over-propped” condition, resulting in “lugging.” This high-torque operation puts a tremendous load on the pistons, crankshaft, and bearings. This guide was put out by Brunswick, Quicksilver’s parent company in 1992. Many people will ask, “I never run my engine at full throttle, so why do I need to know what my WOT RPM is?” To answer that question, we will be looking at a section from Quicksilver’s publication, Everything You Need to Know About Propellers. Not being within this range can not only affect performance, but damage the motor as well. Every engine has a WOT RPM operating range that is specified by the manufacturer. Why are Wide Open Throttle (WOT) RPM so important? As I have mentioned in a previous blog post, what WOT RPM you are getting along with your current propeller size and pitch are the most important numbers for us to determine which props you can and should be running on your boat.
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