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I've been quiet on this for some time, but I have been working on the engine: The machined components are from the past few weeks and the castings I poured today. (I'm quite happy with how the gears and the cams turned out.) ...Ved.

This is the thread that just won't die....

Any runner is a success!

As for air compressors, they're Chinese made, but the brand "California Air Compressor" has units that are very quiet (e.g. 65db) compared to most rattletraps sold to consumers now days. I have the 10 gallon version and yes, you can actually have a conversation beside it while the compressor is...

Ahh... You get to have the initial joys of fiddling the the valve timing. If your experience ends up like mine, it'll be about a hour of fine adjustments then all of a sudden the thing jolts to life. Then you'll try to improve it and screw it up. ...Ved.

The blue castings look about what I do in my garage. But then I'm a hobbyist with a crude set up. (My green sand is play sand, water, and pulverized kitty litter). Here's a picture of my latest. (Poured about two weeks ago). The part is about the size of a small apple. Based on the...

That thing looks frightening complex.

This design may work for you: I made this one for myself to run a home built Spin Art machine. Seven castings. Two cylinders, Double acting. It may be a bit more complex than a beginner's wobbler, but it's not the hardest machine to build either. Plans for casting...

I'd love 1,800 rpm. My 83 year old lathe only goes to about 1000. Yet somehow we all manage to cope with what we have. Alas, I have no direct input for you. Perhaps rip the motor out of a Seig and put in another for more rpms?

Yup. My experience with poppet valves is not good. As I've written before, when I tried to make a Webster I had a hell of a time getting the valves to seal even after several attempts. Eventually it went onto the shelf of shame then to an old gear-head co-worker to whom I gifted. I know it's...

Any heat engine has the purpose of converting stored chemical energy into kinetic (mechanical) energy. Often this is then transferred to electrical energy. If you remember Carnot, heat engines have a theoretical maximum efficiency based the temperature difference between two temperature...

Good job David!

I built Elmers steam tubine and pump at 150% scale. It's a memory now. I gave it to my boss when he retired.

Finally! Someone has similar views on the subject. We're making expensive toys. Use whatever material works for you. There is no right or wrong material, method, tool, etc. You get to decide what's right or wrong. (That is, unless you rip your arm off in a machine. Then I'd say you were...

It's been so long since I gave up on the Webster, that I don't quite remember the exact steps. I also tried a couple of different methods which all failed. I remember trying spinning the valve and seat in a drill. I remember trying to "coin" the seat with a press. I remember trying to spin...

I've been working on my four stroke for some time and the main goal of this engine is that it be easy to make. Think Webster but without the poppet valves. Take a look at the video and let me know what you think. I haven't made it to the ignition yet, and I'm very open to suggestions. ...Ved.

A-C also made electrical generation equipment and turbines for hyrdoelectric power plants and such. They were a huge industrial concern.

I put on a coat of paint on my Modified Coomber steam engine. You can find the plans and CAD models here: https://www.homemodelenginemachinist.com/threads/coomber-engine-ideas.32117/ Here's the finished engine:

I wonder why these alternative valving mechanisms didn't hold up? That Condor engine seems like a four stroke version of a Corliss steam engine valve. It seems very simple to me with the valving being one rotating assembly. Perhaps carbon buildup and/or compression leaks were an issue? I do...

The valve design of the RCV engine I like quite a bit. Based on this I think my ideas may have some merit. I'm going for simple, not exotic. Therefore, when I get into the design work, I'll have to keep in mind of the valving. If one valve technology is a bust, then I need to design the...