model engine

just curious if someone knows how the internal valving on this engine operates? or has plans for something similar

thanks

Maybe a variation on Corliss valve gear -- basically oscillating rotary valves operated by those levers. There are animations on the net if you google Corliss valve gear.

Or you could take it apart and see how it works. Perhaps give it a good clean up or any replacement parts needed.

Could be a uniflow engine with the central pore being the exhaust. The cylinder would need to be twice the length of the stroke, and inlet at both ends only More photos would help

would like to take it part but all I have seen are the pictures online

yes may have a look at Corliss - could be some similarities there

As Hopper, could be corliss valve gear, with a link missing ? Noel.

There appears to be only one port at each end. As far as I know a Corliss would have two. Looks like a uniflow

Yes looks like a uniflow set up with the central exhaust port, but with Corliss-style rotary valves rather than the uniflow's more usual poppet valves. Looks like an old model. Is anything known about its history or orgins?

I would have assumed the port facing the front is an inlet? (not exhaust?) - and I assume a uniflow would still need an inlet and exhaust? unless theres another port underneath we cant see.

No further history available, this is for sale on that well known online web site, just described as scratch built.

Any engine will have an inlet and an exhaust

That branch with the screw-plug suggests to me that it is the inlet, with an oiling-point; the exhaust perhaps on the other side.

The blobby soldering is rather at odds with the rest of the design and finish so might have been a later modification or repair, perhaps by an intermediate owner.

Otherwise as others say, semi-rotary valves of some form.

Could be. I agree it's the inlet but wonder if the side thingy is a crude throttle, where tightening that set-screw blocks the input.

Possibly hand-made and early. Seems to be made of Copper apart from the brass inlet which looks manufactured and out of character. Identifying the threads might help, especially if they turn out to be non-standard. I'd love to know exactly how the valves work.

Judging by the finish it was made by an advanced Learner, or possibly it's a proof of concept. Good enough workmanship to run, but far from Exhibition standard. Looks like one of mine!

Dave