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Propellor size

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hydraulic01

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"I have a 28' cape island

"I have a 28' cape island boat with a 85hp lehman engine. It currently has a 20-16 prop installed, I also have a 20-18 prop. Will this engine handle this propellor? I get conflicting information from different propellor manufactures.
85hp (2400-2600 rpm max)
2.1 reduction"
 
what r.p.m are u turning with

what r.p.m are u turning with 20-16 prop and is engine making alot of black smoke.IF the engine makes r.p.m.s with no black smoke after a min or so it probably could handle a little more pitch.If you have the 20-18 without any extra cost try it.
 
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