Intake Manifolds
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Intake Manifolds

  1. #1
    Senior Member lbhsbz's Avatar
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    Default Intake Manifolds

    Under what circumstances would the following be optimal on a jet boat:

    Short dual plane (performer)

    Tall Dual plane (Perf. RPM)

    Air Gap

    Short single plane (eddy torker)

    Twisted short single plane (torker 2-0 with the carb rotated about 30°)

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    Senior Member motormonkey's Avatar
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    Are you fishing for a conflict?

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    Senior Member lbhsbz's Avatar
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    Yeah...I'm bored today.

    Actually, it seems as if the shorty single plane manifolds are advertised to work up to the same RPM range as the tall dual planes, but they aren't advertised as starting to work until a higher RPM range....which seems kinda stupid to me. How can a long runner dual plane work almost the same as a super short runner single plane? I'm sure the answer is, "it can't", but since edelbrock still sells em, along with plenty of others, I'm sure there's a reason behind it. I'm looking for that reason.

    BTW, the motor is a 9:1ish oval port 468 BBC w/ about a .520 lift 218° @ .050 flat hydro cam in it. It had a single carb tunnel ram on it with a cobbled together vac sec. carb that didn't work for shit, among other problems. I bought the boat as a bit of project (cuz I need another one of those) and realized it's been a while since I played with stockers, so I dunno what to do.
    Last edited by lbhsbz; 10-26-2010 at 01:05 PM.

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    Senior Member Widetrack's Avatar
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    Maybe the short intake was built for hood clearence on car apps. But I think a single plane works best on a jet boat app. due to RPM jets cruise in from 2750and up in RPM! I also run a Weiand Stelth that was to help with rear deck clearence! WT JMO!

    Single plane intakes work better in upper RPM!
    Last edited by Widetrack; 10-26-2010 at 01:28 PM.


    SOMEONE SAID YOU CAN'T TAKE IT WITH YOU! SO,IM BURNING IT UP ONE GALLON AT A TIME!
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    Senior Member motormonkey's Avatar
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    Okay Ill play.
    I would use the perfomer rpm air gap with a dominator and a big spacer. Or a tunnell ram with 660's to 5000rpm. Any higher you would need dominators and a sheetmetal intake, Im guessing a spread port head would work to 6000rpm.

  8. #6
    Senior Member lbhsbz's Avatar
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    Quote Originally Posted by motormonkey View Post
    Okay Ill play.
    I would use the perfomer rpm air gap with a dominator and a big spacer. Or a tunnell ram with 660's to 5000rpm. Any higher you would need dominators and a sheetmetal intake, Im guessing a spread port head would work to 6000rpm.
    Good idea...I'm putting in a daycruiser and plan to run in the 10 second class..


    PS: You've been hanging out with Quickjet too much.
    Last edited by lbhsbz; 10-26-2010 at 03:16 PM.

  9. #7
    Senior Member Widetrack's Avatar
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    Quote Originally Posted by lbhsbz View Post
    Good idea...I'm putting in a daycruiser and plan to run in the 10 second class..


    PS: You've been hanging out with Quickjet too much.
    WT


    SOMEONE SAID YOU CAN'T TAKE IT WITH YOU! SO,IM BURNING IT UP ONE GALLON AT A TIME!
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    Senior Member motormonkey's Avatar
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    So you have a goal in mind. I think youll find the advice I gave would put your daycruiser well past the 10 second class. You might be a runner for the 7.70 class that jets can run in now.
    So whats your goal or should we keep playing.

  11. #9
    Senior Member lbhsbz's Avatar
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    I'll beat up on the 7.70 class with my southwind. The cruiser is for the 10 second class. I'm not one of those guys that sets unrealistic goals.

  12. #10
    Senior Member ol guy's Avatar
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    Quote Originally Posted by motormonkey View Post
    Okay Ill play.
    I would use the perfomer rpm air gap with a dominator and a big spacer. Or a tunnell ram with 660's to 5000rpm. Any higher you would need dominators and a sheetmetal intake, Im guessing a spread port head would work to 6000rpm.
    Please don't tell my 454 that! It spins to 6k and wants more but my CAST bottom end wont take to much of that! The air gap with a small dominator would be a better choice for that deal. M

  13. #11
    Purple headed member Quickjet's Avatar
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    Quote Originally Posted by lbhsbz View Post
    Good idea...I'm putting in a daycruiser and plan to run in the 10 second class..


    PS: You've been hanging out with Quickjet too much.
    People dont "Hang Out" with me, they mearly follow....
    Quote Originally Posted by thatguy View Post
    I used to believe QJ was a gay black man..

    Quote Originally Posted by Havasu Secret View Post
    Keith...
    Real Fast Big Blocks are always V-Drives

  14. #12
    Senior Member motormonkey's Avatar
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    Thats what I like to hear. Honesty with your goals. Dont tell anybody else about the secret combination of dual plane intakes, oval port heads and suburban take outs motors.

  15. #13
    Purple headed member Quickjet's Avatar
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    Quote Originally Posted by lbhsbz View Post
    Yeah...I'm bored today.

    Actually, it seems as if the shorty single plane manifolds are advertised to work up to the same RPM range as the tall dual planes, but they aren't advertised as starting to work until a higher RPM range....which seems kinda stupid to me. How can a long runner dual plane work almost the same as a super short runner single plane? I'm sure the answer is, "it can't", but since edelbrock still sells em, along with plenty of others, I'm sure there's a reason behind it. I'm looking for that reason.

    BTW, the motor is a 9:1ish oval port 468 BBC w/ about a .520 lift 218° @ .050 flat hydro cam in it. It had a single carb tunnel ram on it with a cobbled together vac sec. carb that didn't work for shit, among other problems. I bought the boat as a bit of project (cuz I need another one of those) and realized it's been a while since I played with stockers, so I dunno what to do.
    The motor you are working with doesn't make any power so either of the intakes you listed will work or not work all in the same fashion. You will notice no difference between any of them.
    Quote Originally Posted by thatguy View Post
    I used to believe QJ was a gay black man..

    Quote Originally Posted by Havasu Secret View Post
    Keith...
    Real Fast Big Blocks are always V-Drives

  16. #14
    Senior Member motormonkey's Avatar
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    ^^^^Then you get serious guy to step in and Im a little disapointed. Wheres GN7 to bring this up a notch.

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