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Old 12-01-2016, 06:21 PM   #1 (permalink)
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ICE dead, not so fast

The ancient opposed piston layout may come back and fight on.
The lighter, lesser friction surfaces and simpler design do not need the typical four-stroke engine valvetrain, intake and exhaust ports, and complexity of synchronized camshafts and valves.
Electronic control now allows the optimum metering of air and fuel precisely and could take advantage of the design's inherent simplicity and efficiencies.

Opposed-Piston - Achates




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Old 12-01-2016, 10:04 PM   #2 (permalink)
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They say about 4 years from being put in a car. Is this the Elio motor?
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Old 12-01-2016, 11:23 PM   #3 (permalink)
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It would be interesting to see more technical data on the engine. It obviously has some benefits and I'm sure some drawbacks.
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Old 12-02-2016, 08:23 AM   #4 (permalink)
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"Simpler design" should have a disclaimer. It's interesting that you could possibly do away with camshafts, but without additional hardware you now have a fixed valve timing engine. I foresee most solutions to this being more complicated and potentially more failure prone than a balanced rotating shaft.

Plug-in hybrids (or EVs with "range extenders) are certainly one solution to battery limitations, but ICEs today are large and complicated, and take up a significant portion of a vehicle. Anything that can downsize the footprint without sacrificing efficiency would be great.
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Old 12-02-2016, 09:48 AM   #5 (permalink)
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The only 2 stroke engine I have seen that even have a shot at possibly meeting emissions in the US use exhaust valves.
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Old 12-02-2016, 10:15 AM   #6 (permalink)
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Quote:
Originally Posted by oil pan 4 View Post
The only 2 stroke engine I have seen that even have a shot at possibly meeting emissions in the US use exhaust valves.
With direct injection and a cat you shouldn't need them, only issue is you would have to run "lean" to burn the oil blow by or have a trap of some sort
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Old 12-02-2016, 10:59 AM   #7 (permalink)
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Modern snow mobiles run oil injection separate from the fuel.
The exhaust valve engines appeared to allow for more power at full throttle and delay the exhaust rejection to allow more time for better fuel burn at part throttle.
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Old 12-02-2016, 11:21 AM   #8 (permalink)
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The part throttle or variable valve issues could be solved by teaming it with an electic propulsion and running the motor at max power just to recharge batteries. A setup like that should be allowed to have higher emissions while it's running because maybe it only needs to run 1/2 or 1/3 of the time.
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Old 12-02-2016, 12:09 PM   #9 (permalink)
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Achates, Cummins and US Army

Gasoline and diesel (possible multi-fuel) Achates engines for the foundation of Future Fighting Vehicle for the US Army.

Achates Power Wins $14 Million Military Engine Project

us-army-awards-contracts-for-future-fighting-vehicle-designs
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Old 12-02-2016, 12:12 PM   #10 (permalink)
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Different opposed piston engine designs

Opposed piston engine in a hybrid setup.



Another engineering group and their opposed piston/opposed cylinder setup.



Even weirder, a rotating opposed piston engine!



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