Prop vent holes, Heavy cavitation
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Prop vent holes, Heavy cavitation

  1. #1
    Senior Member matt1840's Avatar
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    Default Prop vent holes, Heavy cavitation

    Ive got a 22' scarab with a 23p quicksilver laser II stainless prop equipped with vent holes.. This is a big heavy boat an trying to get on plane is a joke unless i really baby the throttle. Once on plane its all good. I top out at 68 mph at 4500 an that cool with me. Can i get away with having the vent holes welded shut or should i think about the purchase of a new prop? Im convinced the 3 vents are causing my cavitation while trying to get on plane from an idle.

    Ive got a stainless 19p merc vengeance on hand an the stock alum prop as well. Just like the speed the 23 gives me on top.
    Last edited by matt1840; 03-24-2013 at 01:48 PM.
    Matt 74 tahiti 468 olds 72 mph.
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  3. #2
    Senior Member EVILFORCE's Avatar
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    Go to any Mercury Dealer. TRhey have plugs that go in those holes. What drive do you have? I live at Camanche. I have a 5 blade that has a hub for a Alpha 2 drive.

  4. #3
    Senior Member matt1840's Avatar
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    Bravo 1 drive. Id be in the market for a 4 blade. Just dont know what to get or how to decide. Thanks for the info on plugs!!
    Matt 74 tahiti 468 olds 72 mph.
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  6. #4
    Senior Member EVILFORCE's Avatar
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    Mine did best all around with a 21 pitch. Did not seem much different with a 3 or 4 blade. I would use 4 blade. You will probably drop to about 60 mph but it will get out of the hole.

  7. #5
    the silver bullet! TUNNEL T's Avatar
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    Just plug the holes , if merc prop you can get plugs TUNNELT
    FINAL TOUCH DETAILING

  8. #6
    deckboat owner rschap1's Avatar
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    Default holes

    Those holes are there for just that purpose, to create cavitation. For a boat that needs help getting out of the hole, it lets you gain some r's. I had one on a small block alpha. Merc and most prop shops have plugs for those holes. They even make some with different size holes in them to dial in the initial slip. I was told that the prop was suited for outboards when I took mine in to have it balanced and tuned up. My set up did good w/o the plugs because I was really over pitched.

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