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Old 01-01-2017, 09:38 PM   #21 (permalink)
It's all about Diesel
 
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Originally Posted by Fingie View Post
how smooth is this design, anyway?
I don't know, but there are claims that it wouldn't require counterbalancing shafts to run smooth.

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Old 01-12-2017, 02:24 PM   #22 (permalink)
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I'm not sure if i'm missing something but it would seem that the engine would be less efficient. Looking at the animated pictures above that would just be a high compression 3 cylinder with twice the rotating mass since it has two rotating assemblies. Other than possibly starting possibly being quicker and revving faster I would think a high compression 3 cylinder would be more efficient.
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Old 01-12-2017, 11:01 PM   #23 (permalink)
It's all about Diesel
 
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Originally Posted by Phantom View Post
I'm not sure if i'm missing something but it would seem that the engine would be less efficient. Looking at the animated pictures above that would just be a high compression 3 cylinder with twice the rotating mass since it has two rotating assemblies. Other than possibly starting possibly being quicker and revving faster I would think a high compression 3 cylinder would be more efficient.
It gets a longer overall stroke-to-bore ratio and has fewer surfaces where the heat could escape. Honestly I'd still be more worried about the sealing at its sleeve valves in order to decrease the oil consumption.
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Old 01-13-2017, 04:05 AM   #24 (permalink)
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Thermally quote efficient, but intertial and frictional losses from 2 x cranks and the gear required to synchronise them will be significant. I suspect there's a reason why such designs have never been mainstream.
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Old 01-16-2017, 02:16 AM   #25 (permalink)
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The opposed-piston layout used to be mainstream for interwar German aircraft, but it was mostly Diesel and 2-stroke. Anyway, considering that a regular 4-stroke also has some inertial and frictional losses from a conventional valvetrain, the dual-crank setup might outweight this perceived disadvantage.
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Old 11-17-2017, 11:37 PM   #26 (permalink)
It's all about Diesel
 
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Indian company Greaves Cotton, one of the largest independent engine suppliers in India, set a deal with Pinnacle Engines to develop that opposite-piston layout and put it on production. Not sure what would be the first product to feature it, but since many tricycle factories in India resort to Greaves engines it's likely to succeed.

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