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Uncle B commented on March 31, 2013
Compared to the three moving part complete power train electrics? still an internal combustion, so still only 25% efficient, against an electric motor at 99% efficiency. nano carbon super capacitor systems promise high efficiency energy supply for the electrics. Fossil fuel engines epoched by modern Science and technology, belong in the 20th Century American Dream, not the 21st century Global Village realities.
Mr Lama commented on March 16, 2012
Hello sir, How can it be called one stroke because there is only one time firing in total one crank cycle. Design and thinking very good and interesting.App­reciate it. If anybody wants to know about single stroke piston engine pls contact.enginee­ring_nature@yaho­ ... Its totally free.No business no donation, Earth is a basket of will and wish where you can find everything just you should have idea..knowledge and ability to get it.
CRC commented on October 09, 2011
All opposed piston engines have some basic problems. There will be oiling difficulties of the pivot points of the bars. Opposed piston engines rip there selves off of scavenging area by trying to suck in air/fuel mixture for two cylinders in the space of one and/or will have very low compression ratios. I see cooling problems. The one-cycle verion makes two strokes (right and left); how is it a one-cycle engine. Most importantly the leverage to stroke ratio is the same as all regular engines (1:2)which causes inherent inefficiency due to too much piston speed and movement which causes a rapid drop in cylinder pressure early in the power stroke. Although compact there is NO logical scientific reason for a substantial increase in efficiency. CRC
RonD commented on September 10, 2011
There will be slap on the cross bar. The have just moved piston slap to a new place. All of the opposed piston designs have poor control of the intake and exhaust timing. Probably a dirty engine from a pollution stand point. An Atkinson type design doesn't look possible so an inherent poor efficiency.
KingDWS commented on September 09, 2011
This is not a new idea. The Germans used this exact setup in WW2 in E or Scnhell Boats. Those were their equivalent of the PT boats. The reason I found out about this is about 30 years ago I came up with this "new" idea that is pretty much identical to the video. Was great until someone pointed out those Germans.
Delphi commented on September 08, 2011
Very interesting concept. More complex mechanical linkage, challenges in cooling and lubrication, as others have noted. This is a two-stroke engine, though. One cannot charcterize the numbere of strokes based on having multiple pistons. The number of strokes is determined on the basis of any single piston.
RickOsmon commented on September 08, 2011
Only caveat: cannot stack them easily to make an 8 piston design. Possible, but not easy because of exhaust porting. That was the real beauty of Wankel's design. However, 200 HP in a 75 lb package is going to sound really good to the light sport aircraft crowd.
Bert commented on September 08, 2011
Very compact, for the power output. I see a couple of potential problem areas. One is, in the opposed priston design, what happens to the oil when the engine is turned off? In a regular in-line or V design, it drains back into the crankcase. Another is cooling. For such a compact design, you have to get the waste heat out, and I don't know whether water jackets that surround the cylinders are possible here? He did allude to the cooling problem, when he mentioned the extra air pump cylinders needed to force cooling air through the main pistons. Not sure about the efficiency claims, though. I can see higher efficiency in terms of power/weight ratio, but no in terms of Carnot efficiency. At best, a slight advantage because of somewhate reduced friction, and that would be only because of reduced piston slap. But to counter that, you need two crankshafts, so I'm just not convinced in that regard.
michael m commented on September 08, 2011
Neat engine design.
gurugoa commented on August 23, 2011
Looks great
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