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What sort of engine is this?

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PaulR:
Of the thousands of engine on Youtube this has to be one of my favourites but I can't find out any more details, does anyone here know anything about it please?

It seems to be fed with steam in the same manner as the early Murdock oscillating engines, with a (rotary?) valve in a very large chamber, controlled by an eccentric. There seems to be a constant rather than pulsed flow of exhaust steam from the opposite trunnion.

I'd like to build something based on this arrangement as it looks fairly straightforward (apart from the steam connections!).

http://www.youtube.com/watch?v=4OZgJZnlTBM

Sanjay F:
Now that's a piece of kit, luv it! Seems like a resting dragon has awoken in a bad mood!  :)

I came across this when looking, different crank

EricB:
Here's a longer video of that engine. Still no information on it. Neat engine!

http://www.youtube.com/watch?v=cc2m436_WNk

Eric

crueby:
That is a neat engine and also the saw. That engine has plenty of power, and does have a snorting dragon aura!

Jasonb:
There are a lot of different ways to actuate the valves of oscillating engines, some have much like your recent build and just use porting in the mating faces. Others use a fixed point linkage that actuates the valve, others a quadrant and finally an eccentric. That one looks to have  arocking valve rather than a slide valve

The sealing of the trunnions is not too difficult to arrange, just needs some good concentric turning. That one should be quite easy as the inlett and exhaust connections are free to rotate, it's a bit harder when you don't have flexible pipes and they need to remain stationary. Assuming you are not wanting to make a scale looking replica but just replicate the mechanics it would be quite easy to just have two side plates with a hole in them which would be enough for a simple pivot.

I think the constant flow from the exhaust is likely blowby on an old worn engine, possibly the valve leaking..

Couple of types I have done

http://www.youtube.com/watch?v=ZQl8cqJ17Fc

http://www.youtube.com/watch?v=hE2lvebyZlk

http://www.youtube.com/watch?v=YBbB2WvekKo

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