750 or 850 ?
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750 or 850 ?

  1. #1
    MPR FAB southwind011's Avatar
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    Default 750 or 850 ?

    750 or 850 holly on a mild/stock bbc? and double pumper or vac secondary's

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  3. #2
    Senior Member W.O.T's Avatar
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    750 double pumper.

  4. #3
    Senior Member EVILFORCE's Avatar
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    Ya. What he said.
    No Fool Like A Old Fool is there?

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  6. #4
    MPR FAB southwind011's Avatar
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    how will it run with the pumper compared to the vac sec. will it change my fuel mileage

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    Quote Originally Posted by southwind011 View Post
    how will it run with the pumper compared to the vac sec. will it change my fuel mileage
    it will run "great" & if u stay out of the secondary's, ur fuel mileage should be the same...also...if u upgrade the motor in the future, u will have a good carb to work with...many more things u can do to it than a vac sec carb...just my .02 cents

    FastRat

  8. #6
    Senior Member sleekvino's Avatar
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    you should never run a vac carb on a jet boat. why would you!
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  9. #7
    MPR FAB southwind011's Avatar
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    Quote Originally Posted by sleekvino View Post
    you should never run a vac carb on a jet boat. why would you!
    its what was on the boat when i got it. just so i know why should you not run a vac carb on a jet boat

  10. #8
    Senior Member CK7684's Avatar
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    I have a 750 with vacuum secondaries on mine and it works just fine. Vac vs mech is really driver preference. It can be argued that mech sec offer more driver control, but being a jet, the load is pretty much the same at a given rpm, so the sec vac diaphram could be set the where you want them to kick in. Mine open at 4000 rpm like clockwork...

    My .02

  11. #9
    Senior Member GT Jets's Avatar
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    Quote Originally Posted by sleekvino View Post
    you should never run a vac carb on a jet boat. why would you!

    Why? Or perhaps a better question, why not? Wanting to start a conversation based on opinions is all...

    Vacuum secondary carbs work killer on pleasure/cruiser type boats IMHO.

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  12. #10
    E-7 Sheepdog (ret) SmokinLowriderSS's Avatar
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    750 is a fine size for a 450-460" motor not turning past about 5500RPM.

    You CAN run a vac. sec. carb on a jet boat just fine. You won't wring every last drop of maximum performance out of it, but, properly adjusted you don't loose very much.

    Mileage will be similar, IF YOU KEEP YOUR FOOT OUT OF THE SECCONDARIES ON THE Double Pumper.
    If you don't, oh well.
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  13. #11
    Senior Member jetboatperformance's Avatar
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    750 DF DP (Holley or Holley clone) and give it plenty of fuel volume

  14. #12
    Super Moderator HammerDown's Avatar
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    Quote Originally Posted by sleekvino View Post
    you should never run a vac carb on a jet boat. why would you!
    My little 715 vac secondary on this 468 works great on my Jet! Throttle response is almost like FI
    <img src=http://www.performanceboats.com/gallery/data/500/medium/06-30-11_1234.jpg border=0 alt= />

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