How much HP to run a jet 8.0?
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How much HP to run a jet 8.0?

  1. #1
    Distinguished Member David 519's Avatar
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    Default How much HP to run a jet 8.0?

    Mark R posted a question in the V-Drive forum about how much HP is needed to run 8.0 in a flat. Got me wondering how much HP it takes to do the same thing in a jet.
    Since coming back to boats, how hard the jets run today have been one of the big surprises. Back in the day, I don't remember a single jet boat in the 8.0 class. Now there's a bunch that run the number. So, how about it guys. How much HP does it take to run 8.0 in a jet...
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    Senior Member DuaneHTP's Avatar
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    1000 to 1100 HP

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    Senior Member bp298's Avatar
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    Quote Originally Posted by DuaneHTP View Post
    1000 to 1100 HP
    generally speaking, that's a good ballpark, but it depends on the boat - some would need more, some not as much.

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    Senior Member Red Rocket's Avatar
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    I have a light weight boat and make just over 1100 at operating RPM and in 3000ft DA can run in the 7.90's. NA motor no bottle. I think there is more in the set up but is where it was last time I ran.

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    Senior Member cyclone's Avatar
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    i think in a lightweight boat you could do it with 1100hp in great weather conditions.

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    Senior Member DuaneHTP's Avatar
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    It seems to me that a blown motor will do it with somewhere around 1050 HP, but a normally aspirated engine takes closer to 1100 HP or more. I don't want to start any shiz here, but I believe this difference is because of the difference of the torque range of the two different engines.

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    Tom Morrow is running 8`s and better in a jet. Donovan engine and i believe a Placecraft hull.

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    B1 Racing cs19's Avatar
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    Quote Originally Posted by Richard Till View Post
    Tom Morrow is running 8`s and better in a jet. Donovan engine and i believe a Placecraft hull.
    B1Racing.net

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    Senior Member cheyenne580's Avatar
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  12. #10
    steelcomp was here
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    Trick with a jet is to make that power in a "jet friendly" rpm range.
    If God is your co-pilot, change seats!
    Acts 2:38, the perfect answer to the perfect question.

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    Super Moderator HammerDown's Avatar
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    Quote Originally Posted by steelcomp View Post
    Trick with a jet is to make that power in a "jet friendly" rpm range.
    Don't leave us hanging...care to elaborate?
    <img src=http://www.performanceboats.com/gallery/data/500/medium/06-30-11_1234.jpg border=0 alt= />

  14. #12
    Boat 502 76Miller's Avatar
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    [QUOTE=HammerDown;435490]Don't leave us hanging...care to elaborate?[/QUOTE

    You want to make all your power "usable" with your impellor size. If you make peak hp @ 7500 rpm then its most likely wasted power in a jet. If you make it @ 6000 rpm then its "usable". If you can pin point where your peak hp is at, then you can cut your impellor down to run at that rpm. The cam in a jet is everything, you want to carry the torque as far into the rpm range as possible, and make peak hp where you can use it. Most pumps(from what I was told) are not that efficient above 7000 rpm.
    If you spend all your time trying to prove your cooler than everybody else, chances are.....you ain't that cool !

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    steelcomp was here
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    Quote Originally Posted by HammerDown View Post
    Don't leave us hanging...care to elaborate?
    76Miller siad it right. You're limited to the rpm range you have to work with in a jet. 1100 hp used to mean a high rpm exotic pro engine. Not so long agpo, the only engines making that kind of power in the 7K rpm range were blown, but now days with the big displacements and the aftermarket parts that are available it's far more common and easier to get that power down in the 7K rpm range N/A, and why you see so many jets now in the 8.0 bracket. That, and pump and bottom technology has stepped up a little, but IMO, more due to the power.
    If God is your co-pilot, change seats!
    Acts 2:38, the perfect answer to the perfect question.

  16. #14
    Senior Member Woods 017's Avatar
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    Quote Originally Posted by Richard Till View Post
    Tom Morrow is running 8`s and better in a jet. Donovan engine and i believe a Placecraft hull.
    Do you have any pictures or know the name of the boat? Thanks.

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