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Thread: Sideshaft i.c. Horizontal Engine

  1. #1
    Join Date
    Mar 2008
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    Barrie, Ontario, Canada
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    Default Sideshaft i.c. Horizontal Engine

    You fellows may remember---When I was chasing down helical gears for the sideshaft hit and miss engine I built, I bought a pair with 2:1 ratio off Ebay for $12.00 which is about $90 less than I paid for a set made in USA. I used the made in USA gears from Debolt to build my engine, but had the Ebay Chinese gears left over. I watched a YouTube video of an Edgar Westbury engine called the "Centaur" and was very impressed with the valve and sideshaft arrangement on it. Grandma was right--Idle hands truly are the devil's workshop. I was bored this week, so I've been messing around designing another sideshaft engine which uses the Chinese helical gears, and a valve arrangement similar to the Centaur engine. It's not a hit and miss engine--just a 4 cycle open crankshaft engine with a throttled carburetor. I might never build it, but it is interesting.


    Brian Rupnow

  2. #2
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    Mar 2008
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    The engine has a 1" bore and a 1.375" stroke and is air cooled. I will probably design a fan on the side opposite from the sideshaft and drive it with an o-ring drive belt from the crankshaft.

    Brian Rupnow

  3. #3
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    Apr 2009
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    Ashburton, near Christchurch New Zealand
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    Brian, we all hope you will build it and be very satisfied with the outcome!

    john

  4. #4
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    The main chassis of the engine is interesting. It is hogged out of a block of 2" thick 6061 aluminum.
    Brian Rupnow

  5. #5
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    This is a link to a working model of the Centaur engine.
    https://www.youtube.com/watch?time_c...&v=8Am5H2aPmyc
    Brian Rupnow

  6. #6
    Join Date
    Sep 2012
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    Wellington county Ontario Canada
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    I might never build it, but it is interesting.
    I think we see this thing purring away on your bench in a few weeks...
    Cheers,
    Jon

  7. #7
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    Jon--You could very well be right. I am seventy two years old and in reasonably good health, but I am not coping really well with retirement. When I don't have any "real" design work to do, I tend to fill up my life with building small engines to make the days go by.---Brian
    Brian Rupnow

  8. #8
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    Feb 2016
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    Edmonton, Alberta, Canada
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    Is that larger gear going to fit in that spot? It looks like it may interfere with the flywheel on that side...

  9. #9
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    Quote Originally Posted by dave_r View Post
    Is that larger gear going to fit in that spot? It looks like it may interfere with the flywheel on that side...
    It will fit---barely.--See that big slot cut in the side of the main frame in post #4.--that is in there to accommodate the large gear.
    Brian Rupnow

  10. #10
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    Of course, if you have an air cooled cylinder, it's always a good idea to have a cooling fan. I dug around in my "odds and ends" drawer and found the perfect size plastic fan. I also dug around in my aluminum box and found a scrap of 2" aluminum large enough to make the main engine body from, and a piece of 3/4" material large enough to make a base. I spent a couple of hours this morning putting in all of the tapped holes and clearance holes to put this thing together.

    Last edited by brian Rupnow; 03-20-2019 at 11:29 AM.
    Brian Rupnow

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