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Thread: RPM lmitations

  1. #11
    delemorte
    Awesome answers guys. thats what i was looking for.
    And i have not even gotten it in the water yet so i cant tell you what kind of water it will be in.

  2. #12
    delemorte
    As said on here before tho, unless you have one monsterous 350, or a heck of a small impeller, you are unlikely to get over 5-grand, unless you cavitate it by getting airborne. The shock loading on the impeller coming back in the water is far harder on it when the motor has free-wheeled to 6-grand because your foot is still burried in it. Aluminum impellers do NOT like this, and crack and explode shortly, taking bowl parts with them. VERY 'spensive.
    Thats funny in a not so funny way... Yeah i dont expect her to push it past 5 grand in the water but if i hit a wake or something happens and it starts pulling air i want something there beyond my self to stop it from over reving.... I guess if i had more experience i would not worry about such things but i guess being new and being catious is a good thing.

  3. #13
    Ryan00TJ
    One of my previous 360ci SBC's WOT at 5500-5700 all day long. It was a Jasper Marine shortblock. Cast crank, rods, pistons. This was with a sterndrive and not a jet. It had 360hrs on it when I pulled it and everything looked great inside. I'll still have it in the garage for a spare.

  4. #14
    Sleeper CP
    Well i can promise you untril i can afford to replace the motor she wont see 7 grand. 5 grand is even scary to me. Remember i am a newby and not aware what was put into this motor so i cant attest to its strength so i just need a nice safe number.
    Then spend a couple hundred buck and put a rev limiter in it. Does it have a hydlr. flat tappet cam in it? You would be amased as to how fast an engine can go from 4,000 to 7,000 once it becomes unloaded Let's just say before you can say "oh shit". If you can't vouch for the engine and don't want to have to replace it, a rev limiter is cheap insurance. Just my .02
    Sleeper CP
    Big Inch Ford Lover

  5. #15
    Senior Member
    Join Date
    Dec 2009
    Posts
    648
    The last time out this year I was tryin to get some better gps #. The lake wasn't all that choppy and I popped her out of the water at least 3 times that day, and like Sleeper said, your foot is all the way in it, you got it wound up, you get uprooted, and then mega r's(my tach only goes to six and it gets burried in a split second) I read in the last ***boat over revving was one of the top 2 causes for blown motors.

  6. #16
    SmokinLowriderSS
    Thats funny in a not so funny way... Yeah i dont expect her to push it past 5 grand in the water but if i hit a wake or something happens and it starts pulling air i want something there beyond my self to stop it from over reving.... I guess if i had more experience i would not worry about such things but i guess being new and being catious is a good thing.
    I intended for it to be both funny and serious.
    Learn to "feel" the boat, and learn to lift that foot. I have.
    If you just HAVE to have a rev-limiter, fine. Go buy one.
    The best rev-limiter IMO tho, is between your ears. No other one is truly needed, unless you EXPECT to cavitate and have a hard time backing off.
    I seldom get Lowrider aired completely out with water rough enough to send me airborne, and when I have, it's been "Oh crap, a big wake" and dropping the foot out and hanging on.
    When I think a small one will air me out on a WOT run, I pedal it.

  7. #17
    Senior Member
    Join Date
    Dec 2009
    Posts
    648
    Smokin is right(you have to be ready to get out of it). And at 70 shit happens pretty fast. Maybe it's just my boat but there is never/seldom a day I go boating that I don't leave the water at least once

  8. #18
    Sleeper CP
    Cheap insurance. just my.02
    Oh, someone can post a picture for you of what unloading an alum. impeller can do if you don't catch it with your foot fast enough.
    Sleeper Cp
    Big Inch Ford Lover

  9. #19
    uLtRADeNniS
    Smokin is right(you have to be ready to get out of it). And at 70 shit happens pretty fast. Maybe it's just my boat but there is never/seldom a day I go boating that I don't leave the water at least once
    Agreed.. You wanna know when to lift that foot and drop it.. Those rollers come quick. Your gonna have to get over it somehow..and if you going fast(70+)..your gonna shit yourself if you don't know what to do.
    Id say if you where kickin out some real horsepower then defiantly go with a rev limiter. But with your set up its not really necessary. As long as you don't cavitate, you'll be golden. One word of advice...STAY AWAY from wakeboard boats!

  10. #20
    delemorte
    Seeing i am new to all this I dont expect to see 70 any time soon even if it would go that fast. im sure id scare my self at 40...
    remember my experience is in sail baots where 15 knots is hauling butt.
    yes i agree its cheap insurance. if i had more expereince i would not worry about it but its money well spent in my opinion. thanks guys...

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