And... It's a two stroke

[eightsandaces]

Who would have figured that!

http://digg.com/d31BYPa

[CJ_Boxster]

interesting how each cylindar has 2 pistons facing eachother.

[Jaxonalden]

When I started reading this I thought it would be an engine like the one in a torpedo but no...interesting design.

[HDManny]

I would like to see if they can make production car with it, maybe a two passenger mid-engine design. I thought I saw something like it or read about it a long time ago, some type of four stroke engine that the pistons created the combustion area between them. But it only had four pistons total and was similar to a box engine.

[vath2001]

It looks very mechanical. The more moving parts you have, the more likely to have vibration, friction, heat, all the nasty things that kill engines. And I don't see how they say a two stroke will be more fuel efficient... I don't believe that part.

[renzop]

Those connecting rods look dangerously long. I really don't understand the purpose of the extra piston. Also how do you seal the outside piston? Where does the outside con rod go? Is the outside piston wrist pin connected on the outside of the piston rather than the center? If so how could it handle the stress? This looks like a hoax to me.

[stephen wilson]

Seems feasible. The outside piston would seal just like any other, the combustion "chamber" is between the 2 pistons. Wrist pin strength would be fine because there's a rod on either side of the piston, instead of inside, so no cantilevered load. The second piston is needed to uncover the exhaust (intake?) port, and help pump the gasses. I assume the outside rods would be enclosed in the crankcase.