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Strange but simple engine.

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vtsteam:
Ahh, yes it would be symetrical around the pivot extremes, not the piston extremes.  :doh:

But, Russell, I think it's the other way round. It opens after TDC, and closes before BDC and the vacuum pulls the motor around while the port is closed.

Check out the location of the holes on the inner stationary valve piece below, and notice that the flash marks (and moving port marks) is located below the stationary part. I noticed this lower valve location also in the video, though not as easy to see.

With clockwise rotation of the crank valve is open after TDC and closed during the return stroke. Yes? So the vacuum does the work, I believe, thus the "atmospheric engine".

shipto:

--- Quote from: vtsteam on February 27, 2015, 09:40:46 PM ---From what I see, there are only wires going to the spark plug. No fuel line.

--- End quote ---
Quite right, I must have been filling in bits in my head that where not there. so the fuel is carried in that tiny pipe inside the pipe with the ports.
so fuel is atomised between tdc and 15 degrees or there about and ignited right before the ports close.

RussellT:

--- Quote from: vtsteam on February 28, 2015, 02:12:49 PM ---Check out the location of the holes on the inner stationary valve piece below, and notice that the flash marks (and moving port marks) is located below the stationary part. I noticed this lower valve location also in the video, though not as easy to see.

--- End quote ---

I spent ages yesterday looking at this and even trying to read some of the text without much enlightenment.  The still you posted seems to give the best guide but I'm afraid I still don't see it as you do. :scratch:

I agree that the black marks on the stationary part of the valve are caused by combustion.  So that gives two valve positions, one where the ports are (open) and one where the black marks are (closed).  The black marks are below the ports so the valve must be closed when the cylinder is below it's centre position.  Clockwise rotation makes that after TDC.

Russell

vtsteam:
Okay Russell I see it your way, now. The 90 degree part keeps throwing me.  :hammer:

I guess the long open time must be necessary to both get rid of exhaust and pull in a new charge. I'm surprised it runs at all, especially with the ports drilled out of line, as it looks in the photo. Methanol is a very forgiving fuel.

It also looks like the holes on the other side of the pivot aren't opposite the valve ports. They never close completely, and at this point I don't get what they're doing.

Quite the mystery engine.....

It would be interesting to try a pivot valve vaccuum engine similar, though. If the timing could work.

John Hill:

--- Quote from: vtsteam on February 27, 2015, 10:02:59 PM ---John was once interested in a flame licker engine that had internal combustion -- .....

--- End quote ---

You mean me?  I did indeed ponder an internal combustion flame licker, I even got well along on the project but it is presently sitting on the shelf with a couple of other uncompleted jobs,  perhaps I will get enthused again soon? :palm:

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