Intake fins...
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Intake fins...

  1. #1
    I'm No Expert Shaun's Avatar
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    Default Intake fins...

    or skegs or whatever they are called. My left one has apparently taken some serious abuse over the years. It has some nice chunks out of it. Neither of them are smooth and could use some filing. Just wondering, can they be repaired or do i just need to find/buy a new intake?

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  3. #2
    jetboataholic HawaiianJet's Avatar
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    Exclamation

    Yes, they can be repair. But, if you have to repair any major damage on one of them, then you have to take the same amount off the other on.

    I made a template of how much I was going to take off the damaged one, then just transfered it to the other fin, then carefully trimmed it with a cut-off wheel, and rounded the edges back to how the rest of the fin is.




    Good luck.
    HJ

    ***FOR SALE*** 1978 19' Full Stringer Hawaiian Molokai Jet Boat w/ Berkeley 12JC-AB and Chevy 440 Tall Deck ***FOR SALE***

    Quote Originally Posted by mako shark mark View Post
    Oh yeah, Forgot to mention that the hull is a special mixture of speedcote, herculiner and rain-x, all blended together- good for another 8 mph top end.

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    Member bennyb's Avatar
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    My son (BrendellaJet) and I are doing some re-powering on my old eliminator.
    We pulled the pump and one of my fins had a substantial gouge. Jack at MPD welded it up and reshaped it. The cost wasn't all that bad either.
    20'5 Advantage classic cruiser
    Go on get your ass outa here

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  6. #4
    Senior Member Xerophobic's Avatar
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    Intake fins? We dont need no stinking intake fins!

    If you ain't hittin bottom...you ain't jetboatin!

  7. #5
    ... Some Kind Of Monster's Avatar
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    Good topic. My pump is missing about 1/3 of one of it's intake fins. I bought it that way and never had any problems with the boat so I left it. It just snapped off clean. I'm debating whether to weld it back to original, or cut the other side down. Any thoughts? What is the concept behind the fins?

  8. #6
    Cas
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    Angry American Cas's Avatar
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    Quote Originally Posted by Some Kind Of Monster View Post
    What is the concept behind the fins?
    they help keep the boat tracking straight and help the boat from spinning out in a turn.

  9. #7
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    [quote=Shaun;204621]quote]Unless your running over 80 due the best you can to fix asnd Have fun.

  10. #8
    I'm No Expert Shaun's Avatar
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    I dont want to cut the fins down, that seams like a bad fix to me. What i was thinking is what Eliminator Cruiser said and build it back up and reshape.

  11. #9
    I'm No Expert Shaun's Avatar
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    Quote Originally Posted by [email protected] View Post
    Unless your running over 80 due the best you can to fix asnd Have fun.
    I'll be running over 80 if i'm not already, last gps i ran 76.9 and my foats where set way too low so it was stumbling at full throttle. I got that problem resolved and this last time i went out the boat pulled way harder and felt alot faster, i forgot my damn handheld though. Right now i'm running a berk A imp, no shoe, no rideplate, no setback, no loader, stock rock grate so i'm guessing i'll be in the 80's once i start workin the pump more too...

    We'll see what i'm running this next trip.

  12. #10
    jetboataholic HawaiianJet's Avatar
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    Quote Originally Posted by Shaun View Post
    I dont want to cut the fins down, that seams like a bad fix to me. What i was thinking is what Eliminator Cruiser said and build it back up and reshape.
    Can we see some pics of what they look like? Because if they're just dinged up a bit, then it would probably be better to just hit them real quick with a sander. For just one chunk, like I had, it was easier to just cut a small portion of the front edge off, maybe not the ideal fix, but I bet it won't make any difference in how the boat will act. But, if there are several chunks missing, then welding would be the preferred method of fixing it.
    HJ

    ***FOR SALE*** 1978 19' Full Stringer Hawaiian Molokai Jet Boat w/ Berkeley 12JC-AB and Chevy 440 Tall Deck ***FOR SALE***

    Quote Originally Posted by mako shark mark View Post
    Oh yeah, Forgot to mention that the hull is a special mixture of speedcote, herculiner and rain-x, all blended together- good for another 8 mph top end.

  13. #11
    I'm No Expert Shaun's Avatar
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  14. #12
    jetboataholic HawaiianJet's Avatar
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    OUCH!!!!!

    Looks like somebody hit something.

    I'd be half tempted to make a template of the good fin, cut out the fin shape,
    cut off that beat up fin, and weld the new fin on in it's place. That would help with the breaking problem because it would be billet.

    But, otherwise WELD IT UP, back to where it used to be, then grind it all back down smooth.
    HJ

    ***FOR SALE*** 1978 19' Full Stringer Hawaiian Molokai Jet Boat w/ Berkeley 12JC-AB and Chevy 440 Tall Deck ***FOR SALE***

    Quote Originally Posted by mako shark mark View Post
    Oh yeah, Forgot to mention that the hull is a special mixture of speedcote, herculiner and rain-x, all blended together- good for another 8 mph top end.

  15. #13
    I'm No Expert Shaun's Avatar
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    ya, i'm not sure how they got that way, were talking about a intake thats probably the original intake in this boat, i know it hasnt been removed for the last 15 years, not sure before that.. the boats a 76.

  16. #14
    Senior Member CHEVY JET's Avatar
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    It Is Aluminum, Call A Welder With A Tig And Get A File And A Grinder. Once You Get A Couple Of Passes Grind It Down And Do It Again Until It's How You Want It. Use The File At The End To Fine Tune. Good Luck It Can Definetly Be Saved.

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