cooling radiator air supply

Discussion in 'Boat Design' started by rick gray, Nov 6, 2016.

  1. rick gray
    Joined: Dec 2012
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    Location: port coquitlam B.C.

    rick gray Junior Member

    airflow

    Barry: thanks for details ,some details may help. I intend to but carb in a sealed tray with drain ,to keep eye out for leaks steel gas lines , engine compartment is sealed for most part not gas tight, i have a carb anti flash air filter to use have small hatch door in cover to sniff detect gas fumes . i am running two rads and elect fans may try to add heat exchanger in sea bay. explosion proof alternator , ignition is good idea.
     
  2. rick gray
    Joined: Dec 2012
    Posts: 87
    Likes: 4, Points: 8, Legacy Rep: 30
    Location: port coquitlam B.C.

    rick gray Junior Member

    explosion

    Thanks I know from my old chriscraft that i always checked for fumes at restart I removed or opened floor board and engine cover to look for fumes before start up ,since when underway the fumes for most part are vented out ,but when idling can build up but hopefully fans will reduce fumes i intend on isolating fuel lines(outside) and making a box around carb, with separate air duct to carb ,with a drain and view port. had nightmare fuel leaks with the old Holley carb flooding ,leaking , found Edelbrock better.
     
  3. tom kane
    Joined: Nov 2003
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    Location: Hamilton.New Zealand.

    tom kane Senior Member

    https://www.google.co.nz/search?hl=...Si0#hl=en&tbm=isch&q=long ram induction tubes

    Some one is complaining to me that my promotion of long induction tubes to make a safe remote fuel system for boats does not work.
    Jaguar and Chrysler and many other Manufacturers have been using long ram tubes for years and most modern autos use long ram tubes.
    What works for autos must work for boats if you understand the technology and can apply it.
     
  4. Barry
    Joined: Mar 2002
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    Barry Senior Member

    There are quite a few fuel vapor sensors available. Probably 125 bucks Canadian
     
  5. rick gray
    Joined: Dec 2012
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    Location: port coquitlam B.C.

    rick gray Junior Member

    ram tubes

    Tom; since an engine is an air pump, i should get away with a 4X4 inch tube 3 feet down from deckhouse top to carb with a small ram scoop at top? i intend on bolting an aluminium spacer / box on top of intake manifold and only vented to house top and run fuel line in same tube to reduce fire hazard i will add a flame arrester too carb and a drain to side shell if flooding occurs.
     
  6. tom kane
    Joined: Nov 2003
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    Location: Hamilton.New Zealand.

    tom kane Senior Member

    As there are so many ways to make boat fuel systems safer by using different proven ideas you will have to do the best you can.

    Just because you have checked your plans once does not mean you should not check again.
     
  7. rick gray
    Joined: Dec 2012
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    Location: port coquitlam B.C.

    rick gray Junior Member

    fuel system

    Tom: i intend to fabricate fuel tanks and add them on either side of jet drive nozzle ,they will act as hull extension to aid floatation ,as i am not sure about draft and balance , Porpoising is a possibility coast guard does not approve of built in tanks? they seem to prefer independent free standing tanks
     
  8. tom kane
    Joined: Nov 2003
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    Location: Hamilton.New Zealand.

    tom kane Senior Member

    Aircraft and military vehicles have interesting fluid cooling radiator installations.
     

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  9. rick gray
    Joined: Dec 2012
    Posts: 87
    Likes: 4, Points: 8, Legacy Rep: 30
    Location: port coquitlam B.C.

    rick gray Junior Member

    Military Outfitting

    Tom ; Yes!!! i have seen some fittings for doors ,ramps etc. i did install all fold down door in nice breaker bulwark at bow ,it was slick. you grabbed a rail and pulled it up and over and the bulwark door folded down to make a platform to allow testing of water i intend on making mine like a small jet fold down door that its actually a stairway ,same principle. i have one now, in transom above waterline . all i have access door in front windshield to get to seating at bow, with fold down hatches to close up .
     
  10. Barry
    Joined: Mar 2002
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    Barry Senior Member

    If you extend the hull you will obviously ensure that the extension does not get in the way of either the reverse or steering.

    The extension will not make porpoising worse.

    If you mean that the CG does not approve of built in tanks in that the outer skin of the hull, bottom or side or internal structural member is not common with the tank sides, you are correct.

    The reason that ABYC/CG does not want the tanks integral to the hull for gasoline is quite simple and that is that the hull will flex at different rates than the tank material and will cause stress concentrations, often below yield, but over time can cause work hardening and then cracks. Gasoline in a hull is unsafe

    If you decide to go with a stand alone steel tank, they have to be hot dip galvanized inside and out. Assuming that you stay with aluminum, you will need baffles PROPERLY installed to ABYC specs and I would introduce inside stringers, say 1 1/2 inch by 3/6 flat at 16 inch centers inside the tank to stiffen the structure. Ie make horizontal perimeters, inside with the flat on edge and joint all the flats together. Easiest to overlap at the corners.

    Also aluminum tanks cannot come in contact with any brass fitting or brass bolts. Only 300 series stainless.
    The tank must sit on a urethane or uhmw base, usually strips so water cannot sit between the tank the bottom plastic and the best way is to strap them down.
    The best way alternatively is to glue the plastic/rubber to the bottom of the tank
    The straps also require the same plastic gasket if you will, between the straps and the tank to inhibit leaks from rubbing.

    Do not weld feet onto the aluminum tank and bolt it in for the flex situation above.

    If you are installing a sender, you cannot use a cork gasket and the 4 screws that come with the senders are sometime brass or steel. Buy some stainless. not 18 8 or 304 ( these two are much the same) but 316 stainless fasteners
     
  11. rick gray
    Joined: Dec 2012
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    Location: port coquitlam B.C.

    rick gray Junior Member

    Barry: you got me there? i intended to bolt/clip the tanks on to transom ,but now you tipped me about stress ,i get it!! i still think stainless straps is a hassle,so i may use a ground bar ,like old rivet days and the flat bar bolting flange is welded on transom at deck and corners and runs full length with s.s bolts bolted to a flatbar doubler flange welded on tank i always use 316 bolts etc everything on outside of hull even then there is some electrolysis? i have a 7014 aircraft alloy aluminium for tanks .will have coatings well ,but not in salt water much for extended times
     
    Last edited: Nov 14, 2016
  12. Barry
    Joined: Mar 2002
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    Barry Senior Member

    You do not have to use stainless straps, aluminum would do
    Why would you go for 7014 for the tanks. When you weld them the weld changes to zero temper,

    I have never worked with 7014 and would check the bend radius if you are going to form some of the corners with a brake. Normally the higher the alloy series the more difficult it is to bend without cracking. I could not find the bend radius on line but I am sure that it is there
     

  13. rick gray
    Joined: Dec 2012
    Posts: 87
    Likes: 4, Points: 8, Legacy Rep: 30
    Location: port coquitlam B.C.

    rick gray Junior Member

    high alloy aluminium

    yes it cannot be bent too sharp and is more subject to corrosion, i got a deal on it. it looses strength at welds,but ok for me . i will make flat bar frame to mount tank.i will use electric fuel pumps ,one push one pull, so no mechanical fuel pump in engine compartment. the tanks are the furthest aft ,so i will add bumpers at water line . so no direct hits on tank sides or rear,since i will be on the road in traffic i have good window and mirror visibility.
     
    Last edited: Nov 14, 2016
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