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Thread: Heat extractor

  1. #1
    Beagleman62's Avatar
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    Heat extractor

    Has anyone come up with anything similar to the R-Rated heat extractor kit? or a system that does the same thing? When it gets really hot in July and August I'm guessing that hot air inside the hull is going to be a problem.


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    tomgtv's Avatar
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    bilge blowers

    On another thread I got the tip to put in regular marine
    12v bilge blowers on those two plastic hoses connected
    to the rear outlets under the small seat. They are there
    per CG rules for ventilating bilge gas fumes but are not
    powered like regular boats.
    You could put a simple switch and turn 'em on at idle or
    any other time.
    My question is would you blow or suck (no R rated thoughts
    here) the air out of the engine compartment?

    Should work good, I know my seat gets hot when I slow down
    after up on plane, the hold, i.e. engine compartment, must be
    hot!
    Last edited by tomgtv; 05-09-2007 at 06:54 AM.

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    tomgtv's Avatar
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    Bilge Blower

    http://www.parkeryamaha.com/index.as...D&ProdID=19474
    Here's one choice from Attwood. Less than $20....cheap enough, low power
    consumption too.

    It would be easy to hook up. I don't even thing I'd screw it down,
    maybe just some velcro down low in hull where those hoses terminate.
    I would say those hoses are 4", therefore easy hook up.
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    Beagleman62's Avatar
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    When I took my first rides back in march, it was still kinda cold. I would take my feet and put them up against the hull to keep them warm. It was like putting your feet on a heating pad. That made me think about heat during the hot months of summer.

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    Silence! I Keel You! earthshaker's Avatar
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    Great find Tom.

    I too have been working on ideas for intake and exhaust and forced ventilation is the way I was leaning. Somebody has to have already engineered a system somewhere. I think drawing air in from the front might work well since you would not be fighting the forces from the engine intake....it seems you would be fighting the forces by exhausting.

    These attwood fans run 100cfm (3") and i don't think that will create a pressure differential great enough to pull in water while capsized.....but then you could relay the system on when ignition on conditions are met, or thermostatically controlled.

    I am curious about how deep in the hull those forward intake hoses must be to prevent water ingestion for the offshore folks.

    This project will be fun.
    Last edited by earthshaker; 05-09-2007 at 09:21 AM.

  6. #6
    Beagleman62's Avatar
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    Quote Originally Posted by earthshaker View Post
    Great find Tom.

    I too have been working on ideas for intake and exhaust and forced ventilation is the way I was leaning. Somebody has to have already engineered a system somewhere. I think drawing air in from the front might work well since you would not be fighting the forces from the engine intake....it seems you would be fighting the forces by exhausting.

    These attwood fans run 100cfm (3") and i don't think that will create a pressure differential great enough to pull in water while capsized.....but then you could relay the system on when ignition on conditions are met, or thermostatically controlled.

    I am curious about how deep in the hull those forward intake hoses must be to prevent water ingestion for the offshore folks.

    This project will be fun.
    What are your ideas on the intake side? I have some exhaust parts coming but also want to do something on the intake.

  7. #7
    Silence! I Keel You! earthshaker's Avatar
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    Hey Beagle,

    I meant the ports on the boat hull. Sorry for the confusion. I was calling the ones in front intake and rear exhaust for a couple of reasons.....
    1. Riva or RD is mfg "heat extractors"
    which my understanding is they replace or add to the hoses in rear. They look like a venturi principal without looking to close
    2. the engine intake is up front near the other 2 ports

    I have not done any math, but figure that the beast is pulling in quite a volume of air. Maybe 427 has done the math already with his neat homemade airbox. (hey 427, we need to get cold air in there...ideas?) It seems to me without much thought yet that the pushing or pulling the air INTO the hull at the front would better serve since it is closer to the intake side of the engine and would seem to have less rival forces. Apparently Kawasaki relies on that intercooler quite a bit eh? I see need for improvement here.

    I like the (forgive me) riva? glovebox intake but it won't meet my needs unfortunately..plus i like my glovebox for beverage shaken not stirred.

    I do have some thoughts about engine intake....they revolve around ram air similar to Skips machine. I don't have too much to say as it kinda related to this area as well. Nothing set in stone.
    Last edited by earthshaker; 05-09-2007 at 01:57 PM.

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