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redsnapper386

Regular Contributor
"guy's,on today's 350

"guy's,on today's 350 vortek motors,is the horsepower rated at the crank shaft,or the prop.if it is rated at the crank,how much is lost compared at the prop.is there a formula.thank's."
 
"Marine engines are rated at t

"Marine engines are rated at the prop. There is some power lost through the gears in between but there is no reliable formula. And the NMMA rating system allows an engine manufacturer to rate it within 10% of the actual. That's why Merc may rate a 5.7L at 300 and Volvo may call it a 320 - same engine, same RPM, same parasitic loss, same performance, different number - just marketing fluff."
 
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