OPOC Engine

[Mr Hammers]

Interesting and unique engine configuration, called Opoc, or Opposing Cylinder engine;

https://www.xconomy.com/detroit/2010/11/01/khosla-gates-are-betting-on-ecomotors-engine-technology-to-transform-autos-into-cleaner-cheaper-and-more-powerful-machines/?single_page=true

and a vid of how it works;

https://ecomotors.com/videos/introduction-opoc%E2%84%A2-powertrain
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[Didge]

I saw something about that, a short time back.

Very interesting concept, and it looks like a realistic proposition.

Thanks for the links.

[Kickstart]

Hi

I am unsure of this. Saw it a while ago but that video had a bit more detail.

The 2nd piston and extra long connecting rod would seem to add a massive amount of reciprocating mass. While I can see that this gives them an advantage for 2 stroke porting (but having the pistons move at different speeds at different times, and each control different bits of the porting), I would think that they could get the same effect from using conventional valves on a 2 stroke without anything like the same reciprocating weight.

That would do without the rpm advantage they mention. However would think you could get the same advantage more simply using a 2nd crank (or 2nd and 3rd cranks for the opposed piston setup), and using a different stroke or con rod length for the extra cranks to change the porting easily. This should be far less bulky as well, avoiding the need for space either side of the cylinder for extra con rods (just one side for the 2nd crank drive).

If you did use multiple cranks then probably easiest to use 3 crank in a triangle, like the old Napier Deltic engine.

The idea that it is better for epa tests as only one cylinder pair is firing under test conditions seems fine, but also seems somewhat of a bodge to get around the tests. And a similar advantage could be had with an engine made from a series of conventional 4 stroke singles (or any other simple engine, including rotaries) joined with clutches.

All the best

Keith
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[map]

Interesting but I'd have thought too many moving parts.
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