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Propellors

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Old 04-29-2002, 11:10 PM
  #1
hardpleasures
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Question Propellors

I JUST REPOWERED MY 37 MIDNIGHT WITH 575 600HP NA FROM 540 550HP NA. THE BOAT HAS BEEN LAID UP FOR A FEW YEARS. MY OLD PROPS WERE 26 X 17 3 BLADES ACHIEVING 74MPH WOT.
MY NEW PROPS ARE USED 27 X 16 3 BLADE, I AM UNABLE TO GO BEYOND 5000 RPM AND LESS THAN 74 MPH. THIS PROP FEELS MORE SLUGGISH OUT OF THE HOLE VERSUS MY OLD PROPS WHICH I DO NOT HAVE ANYMORE TO INTERCHANGE. MY QUESTION IS CAN A PROP LOOK GOOD AND BE BAD,RESTRICTING TOP RPM AND MAYBE INCREASING FUEL CONSUMPTION. I GOT MORE HP ,BIGGER PROPS AND LESS SPEED ?????
 
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Old 04-29-2002, 11:40 PM
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If you didn't increase power I wouldn't expect any speed increase from just props.
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Old 04-29-2002, 11:58 PM
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You may not have enough HP at 5000 rpm to get over the hump to where your new engine makes max HP/ torque. Did you put in a larger cam?
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