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Old 01-20-2015, 08:30 AM   #30
FF
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Join Date: Oct 2007
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The concept of overproping is purely for the folks that will be OPERATING at that RPM.

Matching the load to the most efficient range the engine is built for is the key to cruising.As SKI noted.

Everyone Balks at the use of an EGT gauge , which is only about $100 or so.

1/10 a boat buck to have the engine perhaps last 2x as long due to proper loading.

The sad part is the engine MFG have fuel maps (but wont give them out) that would allow the engine to be properly sized and operating range matched to the boat.

With the current , set it up as a ski boat or sport fish,(operate at full throttle RPM) however inefficient, the engine will get past the warantee period , the Mfgs only concern.

If its sucking 50% more fuel and is 500-800 RPM over what the boat requires , thats not the Mfg concern.
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