Thread: Under propped?
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Old 03-15-2014, 04:22 AM   #4
Baker
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City: League City, Tx
Country: Texas
Vessel Model: Carver 356
Join Date: Oct 2007
Posts: 6,300
In theory, a properly propped boat will run exactly at the rated RPM of the engine at full throttle. So what RPM are you able to achieve at full throttle? And that will be your answer ref over or under propped. The older slow turning diesels can handle a little over propping as long as you don't push them hard. But I would be inclined to run the engine as it is designed by the manufacturer to run....regardless of what my friends are doing. You are potentially taking longevity out of the engine when you purposely(or accidentally) overprop. How much longevity???? Who knows...and that is my problem with it. You are operating in a realm that was not intended by the manufacturer. So get it properly propped and enjoy the ride.
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