Weed eater engine conversion

Discussion in 'DIY Marinizing' started by Ward, Jun 2, 2003.

  1. JOBBER
    Joined: Sep 2008
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    Location: carol stream, il 60188

    JOBBER Junior Member

    earth/ice auger conversion

    I thought I was the only one crazy enough to think of this too.
    I would prefer the ice auger, as it could used for 2 seasons.
    This site has both ice and earth augers.
    http://www.ardisam.com/
    They have numerous motor sizes, but maximum output (after gearbox) is 320rpm.
    Could a larger diameter and or larger pitch helix on another shaft be used?
    I had contacted another manufacturer about running their auger in a non-vertical position.
    I was informed this was a very unsafe operating mode, and the unit was not designed to work that way - rather uncooperative after that.
    Therefore, I am unsure if the carburetor or the oil lubrication (motor & transmission) would function properly.
     
  2. Mark Wo
    Joined: Dec 2007
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    Location: Minnesota

    Mark Wo Senior Member

    Yep

    Any number of reasons you mention would be the death of motors not desined to run in positions where the oiling can't occur. The guy who builds and sells Rickshaw mud motors tried doing this on 4 stroke motors not designed for running past a certain verticle position - he blew them up.

    Might not have the same problems with 2 strokes.

    As far as gearing. I bet you could take off the housing with the gears and sway out with other gears to get greater rpm's out to a driveshaft. Don't know for certain but it could be possible..

    Mark
     
  3. Tug
    Joined: Aug 2007
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    Location: Muskoka,Ontario,Canada

    Tug Junior Member

    Ice Auger rotation would pull water towards the boat....
    Cheers
    Tug
     
  4. pistnbroke
    Joined: Jan 2009
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    Location: Noosa.Australia where god kissed the earth.

    pistnbroke I try

    Tug get with the programme ...we all know the auger has to be of the right or left pitch
     
  5. tom kane
    Joined: Nov 2003
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    Location: Hamilton.New Zealand.

    tom kane Senior Member

    Hey! why not run it over the front of the boat, Tractor propeller,like a Volvo.
    You won`t be going fast anyway?
     
  6. Mark Wo
    Joined: Dec 2007
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    Location: Minnesota

    Mark Wo Senior Member

    Or....

    .... leave it at the back of the boat and drive backwards. Can you imagine "the fun" one would have once the auger starts "augering" into the bottom of a lake or stream? Good way to make your boat a submersible.

    Mark
     
  7. Erich_870
    Joined: Feb 2009
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    Location: Juneau, Alaska

    Erich_870 Junior Member

    We all live in a yellow submarine... :D

    Can't wait for spring, I want to get out and do some more testing and tweaking with my motor. I wonder if I'd see a power increase with an aftermarket expansion chamber exhaust?! :cool:
     
  8. tom kane
    Joined: Nov 2003
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    Location: Hamilton.New Zealand.

    tom kane Senior Member

    If you want to increase free power for your motor research and try a ram tube and exhaust extractor,you will get a big increase in volumetric efficiency for free. Tubing cost little.
     
  9. 48cc Sit On Top
    Joined: Apr 2012
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    Location: UK

    48cc Sit On Top Junior Member

    What proppeller?

    I have spent ages and ages searching through this thread. I think that pistnbroke was right when he said that a person could have built there motor in the time it takes to read the whole thread.

    I'm making a motor for a sit on top kayak, I have a 48cc kawasaki 2 stroke engine. I spoke to kawasaki and they said that it peaks at 6000 rpm but has a recommended operating rpm of between 5000-5400.

    My boats are a teksport 410 and a liquid logic deuce coupe, I will be mounting it on both of them.

    I am not wonderful with engines and i know my limits, so i dont want to mess about with a gearbox. I am happy to make up a system for steering and dropping the prop in and out of the water.

    I do need help with what prop to use?

    I would like to get the best speed out of my motor, just without having to sort out gearing.

    I will be taking photos all the way through the project and posting them here.
     
  10. Erich_870
    Joined: Feb 2009
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    Location: Juneau, Alaska

    Erich_870 Junior Member

    I'd start with a prop from young's diecast aluminum props. Which way does your motor spin? You'll need either a T-8 or T-10.

    They are inexpensive so if the prop turns out to be too small for your motor, then you can sell it on eBay and get on from them with larger fins.

    I've not found any good information on sizing props for these little engines. It's mostly trial and error until you find a prop with the right size fins so it moves water but doesn't bog down your engine too much.

    Some of those prop design programs my work for you, but there isn't any design information for these little props, so it would be really difficult to make the correlation. You'd have to own every different one and do your own measurements to have empirical data.

    Erich
     
  11. 48cc Sit On Top
    Joined: Apr 2012
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    Location: UK

    48cc Sit On Top Junior Member

    thanks its spins counter clockwise. I'll try a youngs one then thanks for your help. I'll let you know how it works out.

    I forgot to put down that it is a 2.9hp engine
     
  12. 48cc Sit On Top
    Joined: Apr 2012
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    Location: UK

    48cc Sit On Top Junior Member

    Erich,

    Have yo had any problems with your head/gearbox? I noticed that you opted to use it under water.

    Did you use any marine grease on it? or did you just chuck it in the water and hope for the best?

    My motor is from a brushcutter and I also have the same style of bush/gearbox at the end.
     
  13. Mark Wo
    Joined: Dec 2007
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    Location: Minnesota

    Mark Wo Senior Member

    Prop for motor

    Young's prop T-10 will be perfect. There are other versions of the prop that attach differently that can also be used.

    Another option, although more expensive, would be to purchase the 3 bladed prop from Rickshaw motors. I have this prop on one of my motors and it works well. a 2.9 HP motor should have no problems pushing the Rickshaw prop. Might want to start with the $20 Youngs and move to the Rickshaw if you need more "push".

    I have an engine with no gearbox and one with a gearbox (both about 2 hp motors). They both push the boat at a little over 6 mph. Only difference is that the gearboxed motor will push better through weeds, and only by a little.

    Mark
     
  14. 48cc Sit On Top
    Joined: Apr 2012
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    Location: UK

    48cc Sit On Top Junior Member

    Rickshaw prop

    where can i find a Rickshaw prop. I'm in the uk, i have ahad a quick look but cant see a website.

    thanks
     

  15. Mark Wo
    Joined: Dec 2007
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    Location: Minnesota

    Mark Wo Senior Member

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