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> Opposed Piston-Opposed Cylinder
partwerks
post Feb 8 2011, 10:07 PM
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I wonder how this would work in my 914?

http://www.engineeringtv.com/video/Opposed...pposed-Cylinder
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Sleepin
post Feb 8 2011, 10:37 PM
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I was reading about this earlier today! Very cool!


https://www.youtube.com/watch?v=buX89nlww2E
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Elliot Cannon
post Feb 8 2011, 11:35 PM
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I wonder if it has an aviation application?? Two stroke diesel powered by jet fuel. Hmmm.
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partwerks
post Feb 9 2011, 07:21 AM
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Were'nt horizontaly opposed engines used in planes cuz of less weight issues. Looks like this would work better?
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HarveyH
post Feb 9 2011, 07:24 AM
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A more advanced application of pre-WWII technology:

Junker Jumo 204/205 Engine

Harvey
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VaccaRabite
post Feb 9 2011, 08:40 AM
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That is very cool.

The first video was made in 2008. They predicted 18 months to have prototype production. I wonder what has become of it? 40% thermal eff out of a ICE is not bad at all, if they can get it. Average gas powered ICE run at ~25%, and diesels run about 30% thermal eff. 40% would be a big reach forward. If it scales like a diesel, very large diesel engines (think cruise liners) which run at ~50% eff might run at over 66%.

Thats huge!

I wonder what further work has been done.

Zach
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Bartlett 914
post Feb 9 2011, 09:45 AM
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What an interesting concept. Even more interesting is this concept came so early. People in the early part of the century were really creative in their thinking.
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Mike Bellis
post Feb 9 2011, 11:51 AM
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The oposing piston is not new. It was the standard in large diesel engines for locomotive and large ships for years. Not as common today as it once was.
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Tom
post Feb 9 2011, 12:31 PM
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Check this one out.
http://www.wis.co.uk/justin/deltic-engine.html
We had these in the PT boats in Nam! Lots of gear whine.
Tom
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Dr Evil
post Feb 9 2011, 12:35 PM
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There are plenty of videos of these on Youtube using Briggs and Stratton motors bolted together head to head.
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Rand
post Feb 9 2011, 12:57 PM
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Anyone else heard of the Bourke engine? Invented in the 1920s. Also an opposed 2-stroke, but with a huge unique point: Hydrogen detonation. Efficient and super low exhaust temps.

http://en.wikipedia.org/wiki/Bourke_engine
http://www.bourke-engine.com/engine/index.htm
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Dave_Darling
post Feb 9 2011, 07:49 PM
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IIRC, the thermodynamic efficiency of a well-developed 2-stroke diesel motor is right about 40%. So this fits right in with that.

The biggest problems with those are emissions...

--DD
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