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Old 02-13-2009, 09:01 PM
  #11
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Quote:
Originally Posted by DMOORE View Post
I heard the opposite. Black is flywheel, blue is prop.


Darrell.
Black is most certainly crank hp.

We know 525's are more like 540ish at the crank and 500 at the prop.

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Old 02-14-2009, 02:32 PM
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Then why is my HP500 470 HP at the prop?
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Old 02-14-2009, 02:48 PM
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Then why is my HP500 470 HP at the prop?
bc its more like 515-520 at the crank
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Old 02-14-2009, 02:52 PM
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How Merc rates HP, whether its at the prop or crank has changed several times and varies depending on year and engine.
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