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header under cover

  1. #1
    Senior Member rpm0414's Avatar
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    Default header under cover

    Ok some say no water injected headers under motor covers. Jacketed makes sense when space is tight. My aristocrat has huge amount of room under motor cover. Was thinking headers since they don't touch or close to anything at all. If I look at alot of the new race boats with tilting motor cover hatch, they have water injected headers not jacketed. They don't have any rubber hoses to connected to transom tho as with our logs and snails. So whats everyones input? Safe or not safe? Shown is pic of my engine bay. Headers not close to anything.
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    Senior Member fourtznme's Avatar
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    If I remember correctly, They are illegal by USCG regulations, but not sure.
    Murrieta / Needles Marina Park

  4. #3
    Senior Member rpm0414's Avatar
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    Not sure on that one, but check out all the high end race boats. They have headers under hatches.... Howard and Laser to name a couple

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    Senior Member watergun4u's Avatar
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    Quote Originally Posted by rpm0414 View Post
    Ok some say no water injected headers under motor covers. Jacketed makes sense when space is tight. My aristocrat has huge amount of room under motor cover. Was thinking headers since they don't touch or close to anything at all. If I look at alot of the new race boats with tilting motor cover hatch, they have water injected headers not jacketed. They don't have any rubber hoses to connected to transom tho as with our logs and snails. So whats everyones input? Safe or not safe? Shown is pic of my engine bay. Headers not close to anything.
    Well I have been doing this for along time, and I would NEVER put water injected header under a closed engine hatch!!!! The headers get way to hot, and need the air to help cool, besides the water!! I would highly advise against it!! But that is just me I AM SURE there are alot of others on here that will agree! I have seen boat explode with injected headers under a hatch due to fumes!!! think about it before you do it!

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    Senior Member rpm0414's Avatar
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    Ya I'm inclined to agree, I would bet be hot as hell under hatch. Even with ceramic coating and wrap. How do those big builders pull it off? Is there some kind of intake - exhaust fan work I'm not seeing??

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    Senior Member rpm0414's Avatar
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    I'm finishing my new motor(460 ford) and hate the logs. Just seems such a waste. It's like building bad ass motor for a car and putting stock exhaust manifolds on it. Lol. What is our alternative?? Don't want OT headers. Love the look of TT and hatch cover.

  9. #7
    Senior Member rpm0414's Avatar
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    Pic of cover.
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  10. #8
    Senior Member watergun4u's Avatar
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    Quote Originally Posted by rpm0414 View Post
    Pic of cover.
    If you are wanting to go with headers I would go with a water jacketed header most of the closed hatch boats run those you can check them out on eddie marine's site or CMI but they are not cheap! but we run, Rewarder water jacketed headers on my buddy's Ultra 21 ft lx with know problems and they where always cool to the touch!

  11. #9
    Senior Member rpm0414's Avatar
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    Didn't see any pics on their site for jacketed, just injected. Got any pics?

  12. #10
    MLC - Mid Life Crisis probablecause's Avatar
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    Quote Originally Posted by rpm0414 View Post
    I'm finishing my new motor(460 ford) and hate the logs. Just seems such a waste. It's like building bad ass motor for a car and putting stock exhaust manifolds on it. Lol. What is our alternative?? Don't want OT headers. Love the look of TT and hatch cover.
    If logs suck so much then why do many of the turbo motors use them?

    Just my opinion, but maybe it's time for the government to take down the bird feeder!


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    Bass Lake Dream'n "Flat" foot'n's Avatar
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    1st thing, that boat is gorgeous!
    2nd thing, non jacketed headers can get over 1000*! Dana makes some jacketed headers too.
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    BLOWN GAS FLAT TO THE RAMP

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  14. #12
    Senior Member rpm0414's Avatar
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    Turbo motors really just need the exhaust to run the turbo. So doesn't really matter to them as much as us NA guys. A tuned header on NA motor is really good extra hp especially on helping the bbf scavenge exhaust. Thanks for the comment on the boat this is my first jet. Just need better exhaust solution than 3000 dollar headers. Lol. How much you guys think the logs are really gonna choke the motor??

  15. #13
    Bass Lake Dream'n "Flat" foot'n's Avatar
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    I would think what ever the performance loss is, is well worth the benefits of cool-to-the-touch logs you already have. I'd rather spend the $3k on multiple weekends on the water with my family.
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    BLOWN GAS FLAT TO THE RAMP

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  16. #14
    tintingsandiego krusn56's Avatar
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    Get yourself the best log for a ford...through bolt. This is the style usually hooked up with turbo ford....

    This is mine and will be selling them soon to put another set on. Already have the step down cut off snail.
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