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1980's Johnson/Evinrude 20/25hp conversion to 30hp with pics
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<blockquote data-quote="Johny25" data-source="post: 341252" data-attributes="member: 7791"><p>1984 they did not make a 30hp......was a 35hp. 1985 was first year of the prop rated HP and the 35 became the 30hp. So yes prior to 1985 the engines were not putting out the rated HP at the prop. They were rated at the crank before 85'</p><p></p><p> I believe they would lose about 10-15% HP from the crank to the prop so if you calculate that out it would be 2.5 to 3.7hp difference on a pre 1985 25hp engines......so maybe 21.5 to 22.5hp at the prop for a pre 85 25hp....hope this helps</p></blockquote><p></p>
[QUOTE="Johny25, post: 341252, member: 7791"] 1984 they did not make a 30hp......was a 35hp. 1985 was first year of the prop rated HP and the 35 became the 30hp. So yes prior to 1985 the engines were not putting out the rated HP at the prop. They were rated at the crank before 85' I believe they would lose about 10-15% HP from the crank to the prop so if you calculate that out it would be 2.5 to 3.7hp difference on a pre 1985 25hp engines......so maybe 21.5 to 22.5hp at the prop for a pre 85 25hp....hope this helps [/QUOTE]
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1980's Johnson/Evinrude 20/25hp conversion to 30hp with pics
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