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Great , runs superb. !! I didn't see the source of the plans?

Thank you for your time in posting this . I wasn't aware of the polar moment factor. Good morning thoughts to digest today.

My friend Dwight Giles made this Poppin engine approx 30-40 years ago. He never managed to make it run, He has been cleaning shop lately and asked me to look at this engine. As always The machining was excellent . He used cast iron cylinder and Graphite Piston. It took me a while to figure out...

Yes 3/32 I believe, on a .25 " circle with a .25" crank throw.

O.K. thanks for the questions. We, BAEM, used to have shows and ran our stuff all day long on air, so I used Delrin. love the stuff. If you look close at Elmer's plans you will see the the supply ports on the rotary valve are at .25 radius. not the .217" radius that would cover the center...

The plans came from JohnTom website http://www.john-tom.com/ElmersEngines/34_crossTwin.pdf Yes BAEM is a great club but was somewhat intimidating to me at first. Your are building your first engine and a guy shows up with a blown V8. Dwight Giles is now my best buddy. I have always gravitated...

The title says most of it. Elmer's Engines has a Cross Twin Engine at chapter 34. So I call it an Elmer #34. I was fortunate enough almost 20 years ago to see an original design version running at my first visit to a BAEM show. BAEM= Bay Area Emgine Modelers. I joined the club shortly there...

Very interesting results on the 2 ring methods = spring factor . Good luck with the fish.

O.K. science guy here the spindle bearings are precise as are the head pivot bearings. So they are pre-loaded , and are a bit stiff by design. The platters themselves are good first surface mirrors. I was thinking one day of how to align my edge finder quill mounted camera to the knee /...

Beautiful. I think you can skip the iron supplement pills for a while. I can almost taste it. Thanks for all your posts.

Here are the DXF files for what they are worth and = to what I am charging , If anyone is interested in making one. I find it fascinating to watch. No guarantees on anything. I like CamBam as it gives me Gcode almost as fast as I can think of what I want. But not for the modern crowd. Here is...

youtube link I tried to post .dxf files but was blocked.

dxf for what it worth can't load .dxf I guess ?

My short youtube link

Not sure how I did it but it came out as 2 posts with the same name? Oh well I was trying to post one before and 1 after finishing.Photo Oh well, working on a generator and light so it has something to Do. As in" What Does It Do" It will light a light on air power. 50 wat's in 1 wat out.

My mind and shop are scattered . I did use cambam more than ever and have a file for every part. I get to where I want to geterdone more than document. But I documented all the key stuff. The cylinder base is part of the main frame, probably not recommended. At first it was a .5" block and I...

Well here goes the long story. I built a Stuart BEAM engine in ~1989. I learned about the "Watt's" parallel motion. Studying this I found out about the Peaucelliar -Lipkin linkage that is "perfect" . I have always had it in the back of my mind...

Well here goes the long story. I built a Stuart BEAM engine in ~1989. I learned about the "Watt's" parallel motion. Studying this I found out about the Peaucelliar -Lipkin linkage that is "perfect" . I have always had it in the back of my mind...

I made my exhaust valve as a cage . My castings were made by my friend Dwight Giles and were porous. I didn't press it in and had leakage between the seat and exhaust port. Locktite to the rescue. A lot of run time and no problems. Some pictures of it and the hit and miss governor are here...

Beautiful. I recently completed one, and then converted it to Hit and miss. I guess I should start a new thread if anyone is interested. It did get warm/hot without water cooling . now with hit and miss, cool. I was given the challenge to make it hit and miss AND governed. The mechanics are...