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usual question-recommended prop size!

realslimshady

Contributing Member
Boat is a 22' sports type, probably weighing around 1.2 tons (weight of boat and trailer 1800 kilos) , motor is an early 80s Evinrude 90.
Unloaded the motor spins happily up to +/- 6000rpm but underway the stern just digs down and we max out at about 5 knots and 2000 rpm.
Current prop is stamped 13-3/4x15
I accept that I may not have enough engine for the boat, but wondered if I can get some more performance with a lower pitch prop?
Thanks in advance for any help.
 
Run a compression test before spending $$ on a prop, 90 horse does sound underpowered, A lower pitch might get you more rpms,but hull might not plane off,wait for other responses,there will be plenty. Are your throttle plates opening all the way up, pull cowl and take a look.
 
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Hi Johnny. Been through all the usual suspects (compression, carb settings etc.) to get her to run cleanly, which she's doing now. It's just a case of optimizing what I've got...
 
13.x13 to get it moving up the rev range, and do a proper lync n synce or youl never get moving.
or simply vent the 15 pitch to make it at lie a 13 for the pull away.
7/16th vent holes work nice.
 
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