water-cooled trimmer conversion, VEE 4 drawing, and flat head drawing

Discussion in 'General Engine Discussion' started by johnlaudano, Jul 3, 2016.

  1. Jul 3, 2016 #1

    johnlaudano

    johnlaudano

    johnlaudano

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    The Forum moderator has asked for updates on members' activities so I thought I'd add something for what it's worth.

    I've converted a troybilt trimmer engine to water-cooled. It will go into another 65" mahogany boat (see prior posts). The water pump is an internal gear pump made from a honda oil pump. See photos below.

    The attached drawings are designs I've been working on recently. I don't have the machinery to build them unfortunately. The vee four has a displacement of 200cc. The flat head is 100cc. The vee design could also be a twin and the flat head could be a four I suppose.The pump for the vee four is a dual-chamber gear pump of my own design.

    My next project will be a design of an in-line four at a size I think I can construct. It will have a displacement of about 100cc's.

    Below is a link to a video of the converted engine running. I think the ignition system is interfering with my cameras's electronics and that is why the distortion is present. I worry now that, without shielding, an R/C system won't be reliable.

    [ame]https://www.youtube.com/watch?v=mL7i_Nc93Po[/ame]

    View attachment A NEW ENGINE-Model.pdf

    View attachment VEE FOUR-Model2.pdf

    View attachment VEE FOUR-Model.pdf

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  2. Jul 10, 2016 #2

    the engineer

    the engineer

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    brilliant work I love these little 4 strokes
    I am at the moment in the planning stage of twinning a g x 35 honda
     
  3. Jul 10, 2016 #3

    kuhncw

    kuhncw

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    John,

    Thanks for posting your recent work. Interesting way to form a water jacket. How did you keep coolant passages open under the epoxy? I'm guessing you used an epoxy of some sort.

    Nice work on your engine designs. Please keep us posted on your progress.

    I remember your watercooled inine twin.

    Chuck
     
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  4. Jul 15, 2016 #4

    johnlaudano

    johnlaudano

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    Chuck,
    I used o-ring segments between the fins glued in place with cyanoacrylate and then coated them with self leveling rtv. To allow water passage between the fins I drilled small holes in the inner fins. The o-rings are a tight fit and need to be stretched when being installed. Time will tell if there is a leak; there's at least six months more work to be done on the boat.
    I considered epoxy alone as a way to seal the fins but the expansion rate of the aluminum dosent match the epoxy. In order to create the empty space for the water I would have used wax and then melted it out. This method might work with wax and a flexible adhesive in place of rigid epoxy but that has its own issues.
     
  5. Jul 15, 2016 #5

    kuhncw

    kuhncw

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    John, thanks for the explanation. That's a very innovative way to make your water passages.

    Chuck
     
  6. Jul 17, 2017 #6

    johnlaudano

    johnlaudano

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    This is an update on the use of the converted trimmer engine. It's finally in the completed boat and, if the weather is good, will have its first time in the water this Friday. The exhaust system has a large muffler and is water cooled(wet) and it sounds great. I'll have a video at some point.

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  7. Jul 17, 2017 #7

    gadabout

    gadabout

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    Just beautiful!! do you have plans for the boat or a build log somewhere?

    thanks
    Mark
     
  8. Jul 18, 2017 #8

    johnlaudano

    johnlaudano

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    Thanks.
    I made the drawings myself but i didn't write a build log. I do have misc. photos.
    this probably isn't the forum for those but I don't know yet of a proper one.
     
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  9. Jul 19, 2017 #9

    gadabout

    gadabout

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    Is this a different boat to the one with the twin in it? Would the plans be available? Thanks
    Mark
     
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  10. Jul 19, 2017 #10

    Cogsy

    Cogsy

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    I'm sure most people on here would be interested in seeing them, especially considering the quality of the finished boat. Please, go ahead and post them! th_wwp
     
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  11. Jul 19, 2017 #11

    johnlaudano

    johnlaudano

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    Yes this is a different boat. The other one is "Saundra Mae". Search YouTube or google and you'll find a video or two. The hulls are very different.

    Regarding plans; everything is for sale...

    I'll provide build Phots within a couple days.
     
  12. Jul 19, 2017 #12

    johnlaudano

    johnlaudano

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    Yes This is a different boat. The other one is "Saundra Mae". Search YouTube or google and you'll find a video. I hope to have a video of "Sweet Reverie" next week.
    Regarding plans; everything is for sale...
    I'll post some build photos in the next couple days.

    (I've been having trouble posting; if something appears more than once it will be my fault)
     
  13. Jul 19, 2017 #13

    minh-thanh

    minh-thanh

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    Absolutely amazing ! :thumbup:
     
  14. Jul 20, 2017 #14

    gadabout

    gadabout

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    Certainly interested in buying plans!

    thanks
    Mark
     
  15. Jul 22, 2017 #15

    johnlaudano

    johnlaudano

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    Here she is underway. Next is attempting to figure out the right prop size. the current one is a bit big but I'm not sure there is too much pith or too much diameter.

    [ame]https://www.youtube.com/watch?v=QQfZiQOPo3A[/ame]
     
  16. Jul 22, 2017 #16

    johnlaudano

    johnlaudano

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    in the water

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  17. Jul 22, 2017 #17

    johnlaudano

    johnlaudano

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    a few build photos

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  18. Jul 22, 2017 #18

    johnlaudano

    johnlaudano

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    a slightly better video.

    [ame]https://www.youtube.com/watch?v=nes865sbm0s[/ame]
     
  19. Jul 23, 2017 #19

    kuhncw

    kuhncw

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    John,

    Beautiful job on the boat and engine. Runs great.

    I'm looking forward to your next engine build.

    Chuck
     
  20. Jul 23, 2017 #20

    Cogsy

    Cogsy

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    Looks great on the water (except there's no one at the helm...). Loving the build details too.
     

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