Jet horsepower
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Jet horsepower

  1. #1
    Senior Member SBS933's Avatar
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    Default Jet horsepower

    Greg, you wrote an article years ago in Hot Boat about how much horsepower it takes to gain M.P.H in a jet boat. could you post that info. again. I'm afraid I may be getting ready to spend a lot on nothing.

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    Default Mph vs hp

    Quote Originally Posted by SBS933 View Post
    Greg, you wrote an article years ago in Hot Boat about how much horsepower it takes to gain M.P.H in a jet boat. could you post that info. again. I'm afraid I may be getting ready to spend a lot on nothing.
    Do you remember if that was in Hot Boat because I can't find it in Performance boats at this time.

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    Super Moderator HammerDown's Avatar
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    Default

    Or...
    MPH vs WEIGHT
    In the same boat/rpm/setup...by removing 50lbs-100lbs etc, what mph would be gained?
    <img src=http://www.performanceboats.com/gallery/data/500/medium/06-30-11_1234.jpg border=0 alt= />

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    Senior Member SBS933's Avatar
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    No, It was in Hotboat for sure. Unfotunately i gave all my issues to my brother in law. I am going to an all roller system and from what i'm being told i don't have to worry about oil additives and i will gain H.P. and whatever i gain will be a plus, since i told them i want a dependable motor with the valve springs i have ( i just overhauled the heads ) I have a lift of 440 so I don't think they can put me into any danger on the new cam.

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    Default HP Gains

    Quote Originally Posted by SBS933 View Post
    No, It was in Hotboat for sure. Unfotunately i gave all my issues to my brother in law. I am going to an all roller system and from what i'm being told i don't have to worry about oil additives and i will gain H.P. and whatever i gain will be a plus, since i told them i want a dependable motor with the valve springs i have ( i just overhauled the heads ) I have a lift of 440 so I don't think they can put me into any danger on the new cam.
    What cam did you have in your engine prior to going to a roller system. Is the cam you are going to a solid roller or a hyd roller. If you are changing from a flat tappet cam you will have to change valve springs so you can acheive more seat pressure for which ever cam you decide on. When you say you are running a 440 am I to assume that it is a 440 Chrysler, single 4 barrel or dual carbs. What cylinder heads do you have on the engine. There were quite a few options avaiable with the 440 engines so camshaft selection is important.

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    Senior Member SBS933's Avatar
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    Quote Originally Posted by greg shoemaker View Post
    What cam did you have in your engine prior to going to a roller system. Is the cam you are going to a solid roller or a hyd roller. If you are changing from a flat tappet cam you will have to change valve springs so you can acheive more seat pressure for which ever cam you decide on. When you say you are running a 440 am I to assume that it is a 440 Chrysler, single 4 barrel or dual carbs. What cylinder heads do you have on the engine. There were quite a few options avaiable with the 440 engines so camshaft selection is important.
    Greg, I will be going to a roller cam, hyd. rollers and roller rockers they plan on shimming the springs. They are steel BBC heads. The 440 was the lift on the cam.

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    Senior Member Hass828's Avatar
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    Quote Originally Posted by SBS933 View Post
    Greg, I will be going to a roller cam, hyd. rollers and roller rockers they plan on shimming the springs. They are steel BBC heads. The 440 was the lift on the cam.
    .440 lobe lift X 1.7 rocker ratio is .750 -lash at the valve. You will need new springs.
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    Quote Originally Posted by Hass828 View Post
    .440 lobe lift X 1.7 rocker ratio is .750 -lash at the valve. You will need new springs.
    Thanks HASS, I just got my heads rebuilt and spent 2 awesome weeks at the river. I thought I wanted to go to the next level, but decided I don't want to tear this package open till it's time to do a real complete upgrade.

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