big block vs. small block w/blower
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big block vs. small block w/blower

  1. #1
    Member TrynPas's Avatar
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    Default big block vs. small block w/blower

    I know everyone.....and I mean everyone, has a big block something or other in their jet boat. I was cruising through the internet and saw a nifty little 18 with a small block that had a blower on it. It seemed priced the same as if it had a big block in it, but I can't see why this wouldn't be better than a big block (lighter, more RPM, and cheaper to work on). Am I wrong? What are the drawbacks/advantages to a small block w/blower. Thanks in advance for the info.
    Quote Originally Posted by HawaiianJet View Post
    You done got my kentucky ass all confused!!!

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    sixx st. seargant at arms snewton's Avatar
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    Quote Originally Posted by TrynPas View Post
    I know everyone.....and I mean everyone, has a big block something or other in their jet boat. I was cruising through the internet and saw a nifty little 18 with a small block that had a blower on it. It seemed priced the same as if it had a big block in it, but I can't see why this wouldn't be better than a big block (lighter, more RPM, and cheaper to work on). Am I wrong? What are the drawbacks/advantages to a small block w/blower. Thanks in advance for the info.
    lack of torque!

  4. #3
    Broke mo fo djunkie's Avatar
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    No replacement for displacement.

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    Senior Member ap67et10's Avatar
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    yes there is......boost

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    Member TrynPas's Avatar
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    Quote Originally Posted by djunkie View Post
    No replacement for displacement.
    I get the torque thing. I can see that would kill your holeshot, but if a small block has a blower on it and puts out the same HP what would this matter?
    Quote Originally Posted by HawaiianJet View Post
    You done got my kentucky ass all confused!!!

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    Quote Originally Posted by TrynPas View Post
    I get the torque thing. I can see that would kill your holeshot, but if a small block has a blower on it and puts out the same HP what would this matter?
    Pretty sure this subject has been beat to death in the past. And most agreed that in the long run it'll be better with the big block.

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    Member TrynPas's Avatar
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    Quote Originally Posted by djunkie View Post
    Pretty sure this subject has been beat to death in the past. And most agreed that in the long run it'll be better with the big block.
    did a search and couldn't come up with this particular situation. I saw something about 4-bangers and even some turbo stuff, but I'd be happy to check it out if someone points it out to me.
    Quote Originally Posted by HawaiianJet View Post
    You done got my kentucky ass all confused!!!

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    Quote Originally Posted by TrynPas View Post
    did a search and couldn't come up with this particular situation. I saw something about 4-bangers and even some turbo stuff, but I'd be happy to check it out if someone points it out to me.
    Thats cause it was back in the Hotboat forum days.

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    Quote Originally Posted by djunkie View Post
    Thats cause it was back in the Hotboat forum days.
    Well I didn't want to, but I went and looked at Hotboat...checked over 400 threads!! I did find one that is quite similar (didn't ask about the blower though) and someone's response in there covers the blower.
    http://hotboat.com/forums/showthread...ht=small+block The guy points out that he spins more RPMs but that means shorter engine life (never really occured to me). Yeah maybe not the best choice.
    Quote Originally Posted by HawaiianJet View Post
    You done got my kentucky ass all confused!!!

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    Senior Member bc18's Avatar
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    Quote Originally Posted by snewton View Post
    lack of torque!
    so true
    I asked my buddy the same question years back and he said it was always cheaper to run a bigblock because you already had the torque. I dunno im kinda new and shit but i think thats what you want in a boat is tourque. If im worng correct me, i would love to learn something new.

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    Senior Member bc18's Avatar
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    Quote Originally Posted by djunkie View Post
    Pretty sure this subject has been beat to death in the past. And most agreed that in the long run it'll be better with the big block.
    I think the only reason why people have these small blocks is to have something different. i mean you see boats go by all the time with big blocks so maybe somethin different. Like cyclone and his single carb, that thing is bitchen!!!

    I know there is a big torque difference also but if somebody isnt looking for the power in there boat wouldnt this be a cheaper way... isnt a small block cheaper than a big block... at least to rebuild right???

  13. #12
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    Quote Originally Posted by bc18 View Post
    I think the only reason why people have these small blocks is to have something different. i mean you see boats go by all the time with big blocks so maybe somethin different. Like cyclone and his single carb, that thing is bitchen!!!

    I know there is a big torque difference also but if somebody isnt looking for the power in there boat wouldnt this be a cheaper way... isnt a small block cheaper than a big block... at least to rebuild right???
    Not necessarily.

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    Quote Originally Posted by ap67et10 View Post
    yes there is......boost

    and rpm

  15. #14
    jetboataholic HawaiianJet's Avatar
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    I don't think that small blocks have enough low end torque for a jet.

    Big blocks are the cheapest way to go fast, in a jet! Yes, a small block engine would be cheaper to build, and there are a million and a half small block engine builders out there verses big block builders, but I doubt you could ever race it (without dumping tons of money into it). How many small block race jet boats have you see?

    Also, don't jets become less efficient in the higher rpm ranges, I don't know exactly what range, so lets say above 7000 rpm. Isn't the most efficient rpm somewhere between 5000 and 6000? Over 7 grand and you'll be talking gearboxes and shit. Please correct me if I'm wrong.

    Keep searching TrynPas, especially if it's in the same price range as a big block jet.

    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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