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Can someone tell me how this works?

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abby

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The link is to a slide valve triple expansion engine ,not a poppet valve engine . A google search for "poppet valve steam engine"will reveal all !
 

aonemarine

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To me it appears to be more of a bash valve hybrid. Possibly the piston hitting the bash valve then feeding steam to a different cylinder. Interesting.... Typically the bash valve would feed the cylinder its installed on. If it were a poppet valve it would have some type of cam to actuate the valve, and im just not seeing that....
 

charlesfitton

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To me it appears to be more of a bash valve hybrid. Possibly the piston hitting the bash valve then feeding steam to a different cylinder. Interesting.... Typically the bash valve would feed the cylinder its installed on. If it were a poppet valve it would have some type of cam to actuate the valve, and im just not seeing that....
I agree - Piston hits the stem of a poppet valve and actuates it. Valve opens into a chamber which vents into a different cylinder...but I cant visualize it on a three cylinder. Admission into the next cylinder would be at less than optimum point in the cycle.. a five or six cyl...or a radial maybe...

and it seems to self start.

....anything I try to picture makes my head hurt
 

aonemarine

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I agree - Piston hits the stem of a poppet valve and actuates it. Valve opens into a chamber which vents into a different cylinder...but I cant visualize it on a three cylinder. Admission into the next cylinder would be at less than optimum point in the cycle.. a five or six cyl...or a radial maybe...

and it seems to self start.

....anything I try to picture makes my head hurt
Makes my head hurt as well, but im thinking that the valve is actually closed on the cylinder that is actuating it until it moves past tdc and the cylinder being fed is at or nearing tdc. going with this idea I would have to think that its not a poppet valve but more of a spool valve or something. Ill have to review some of Chuck Fellows air engines to get some more insight on possible arrangements. Have you tried getting in touch with the engines re builder on you tube? Im sure its a simple design once we understand whats going on.

Charles, I see where you posted on youtube looking for more information. I also posted and liknked in this thread so maybe he will come join us....
 

charlesfitton

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[QUOTE Will be interesting to see it torn all the way down.[/QUOTE]

Owner and I are chatting and he's promised more photos... This could become my favourite engine

f
 

aonemarine

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[QUOTE Will be interesting to see it torn all the way down.
Owner and I are chatting and he's promised more photos... This could become my favourite engine

f[/QUOTE]

looking forward to seeing some more pictures. I wouldnt mind building this one myself.
 

Anatol

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Owner and I are chatting and he's promised more photos... This could become my favourite engine

f
looking forward to seeing some more pictures. I wouldnt mind building this one myself.
[/QUOTE]
did anyone find out anything about this engine? The short video on youtube is not explanatory and all otter links are dead.
thx!
 

JCSteam

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looking forward to seeing some more pictures. I wouldnt mind building this one myself.
did anyone find out anything about this engine? The short video on youtube is not explanatory and all otter links are dead.
thx!
[/QUOTE]

Hello,

The owner doesnt know much about it im afraid, though if you message "Synthpunks" on the mamod forums im sure he'd give you some more info or pics, In the meantime, his blog gives a slight bit more info on it. Certainly more than the video.

Regards
Jon
 

Anatol

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Thanks
the 3 cyl is curious, I'd like to know more about valve arrangement
 

skyline1

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Got me baffled

But it works!

balanced three pot (designed for speed )
is it a high speed steam engine ?

Or a baby diesel ?

Best Regards Mark
 

skyline1

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judging from the way it goes on air I think it's an old steam hydro motor (high speed fast steam hydroplanes with flash boilers )

World record for one is (not quite sure ) in excess of 100 MPH
 
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JCSteam

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judging from the way it goes on air I think it's an old steam hydro motor (high speed fast steam hydroplanes with flash boilers )
That'ld be my thought too, but I haven't yet seen this design before. In past ME editions I have or anywhere else on line.
I think there's spring loaded slide valves, with a rocker arm to the side, the rocker arm lifts the valve and shaped shut by the spring on the inlet side only, rest of the time it's open to exhaust.

I may be completely wrong on the assumption above though.
Jon
 

teeleevs

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This is my Bash valve engine, the valve is a tire valve, it has a large compression chamber, a projection on top of the piston hits the tire valve giving a shot of air which exhausts at the bottom of the stroke through ports, timing adjustment is by screwing in the valve. At low pressure it will bounce back and forth, increase the pressure slightly until it goes right over and it will tick over nicely. It can put on a good turn of revs. The heavier the flywheel the better.
 

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