Author Topic: 2 cycle engine, spark ignition from bar stock  (Read 2496 times)

Offline Brian Rupnow

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2 cycle engine, spark ignition from bar stock
« on: February 08, 2016, 04:02:14 PM »
Gentlemen--I am looking for a set of plans for a single cylinder, spark ignition, air or water cooled engine, about 1" bore, built from bar stock, no castings. I started modeling the Wombat by Edgar Westbury, but found that there were enough mistakes in his drawings that I gave up on it. I have since found out that no-one has ever successfully built that engine. Apparently it was designed near the end of Mr. Westbury's life, when he was in ill health. If you have such plans as I require, and it is an engine that has been actually built and ran successfully, could you please email them to me at brupnow@rogers.com, or contact me about a purchase price.---Or, if you are aware of any books that carry such plans, please let me know what book it is and where I might purchase it. I promise a full "build thread" if I can run down a set of plans. I have spent 3 days contacting specialty bookstores and searching the internet, and I can not find what I want. I have built ten 4-cycle model engines, most recently a dual opposed single cam engine, very reminiscent of the old Volkswagen beetle engine. Now I want to try a 2 stroke, but not a glow-plug or diesel type.--I have attached a Youtube video link to the engine I have just finished.-Brian Rupnow
https://www.youtube.com/watch?v=whXt2ZTvw1c&feature=youtu.be
« Last Edit: February 08, 2016, 05:06:59 PM by Brian Rupnow »

Offline SwarfnStuff

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Re: 2 cycle engine, spark ignition from bar stock
« Reply #1 on: February 09, 2016, 01:47:41 AM »
Thank you for posting Brian, I had a look at your engine - very nice runner.
Regarding your request for a two stroke from bar stock this one from jon-tom is all barstock. Have a look, the plans are free so nothing to lose. It may fit what you are looking for. Looks like only 1/5" bore may be a tad small, depends on what you fancy.
Regards,
John B;

http://www.john-tom.com/MyPlans/SteamPlans3/Shane2Stroke/Shanes_Two_Stroke_IC_Engine.pdf
Converting good metal into swarf sometimes ending up with something useful. ;-)

Offline Alan Haisley

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Re: 2 cycle engine, spark ignition from bar stock
« Reply #2 on: February 09, 2016, 07:18:44 PM »
Brian,
Jan Ridders has plans for some two cycle spark ignition engines. You might find a basis to work from on his site.
Alan

Offline Brian Rupnow

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Re: 2 cycle engine, spark ignition from bar stock
« Reply #3 on: February 09, 2016, 08:11:11 PM »
Alan--I haven't completely ruled out Jan Ridders engines. Jan does some great work, but I know of a number of people who have built his two strokes and couldn't get them to run properly without modifying them. He does take a very novel approach, having a separate "expansion chamber" instead of using the crankcase as part of the induction system. Obviously they do run, I've watched the video's of them, but I was hoping for something more conventional, more like one of the aero diesels used in model aircraft, only with a lower compression ratio and a sparkplug rather than a glow plug.---Brian