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Are today's 4-strokes more powerful than the old 2-strokes?
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<blockquote data-quote="Tallpine" data-source="post: 379566" data-attributes="member: 14989"><p>They changed the way they rated in 1983. Older motors were tested at the flywheel, after 83 at the prop shaft and the difference is very slight. Probably more important than horsepower between 2 stroke vs 4 stroke is the weight to hp ratio in practical aplication. Also, ratings are taken at certain rpms. So a 1990 15 hp Johnson 2 stroke may be rated at the same hp as another motor of equal hp, but the torque curve may be different. The same thing applies to 4 stroke versus 2. The 2 stroke is the quarterhorse of the two because of the hp to weight ratio.</p></blockquote><p></p>
[QUOTE="Tallpine, post: 379566, member: 14989"] They changed the way they rated in 1983. Older motors were tested at the flywheel, after 83 at the prop shaft and the difference is very slight. Probably more important than horsepower between 2 stroke vs 4 stroke is the weight to hp ratio in practical aplication. Also, ratings are taken at certain rpms. So a 1990 15 hp Johnson 2 stroke may be rated at the same hp as another motor of equal hp, but the torque curve may be different. The same thing applies to 4 stroke versus 2. The 2 stroke is the quarterhorse of the two because of the hp to weight ratio. [/QUOTE]
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Are today's 4-strokes more powerful than the old 2-strokes?
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