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Old 12-02-2016, 01:27 PM   #11 (permalink)
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Quote:
Originally Posted by botsapper View Post
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
? 1 cylinder opposed cylinder engine???

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Old 12-02-2016, 02:03 PM   #12 (permalink)
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cylinder is the space for the piston.

Two pistons in one cylinder
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Old 12-03-2016, 12:26 AM   #13 (permalink)
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Some years ago, a British magazine did a test with an old Commer truck with the TS3 "Knocker" engine and Euro-3 versions of the Isuzu NPR, Mercedes-Benz Sprinter (IIRC it was a 413CDI) and a Fiat Ducato, and almost all the emissions from the Commer were lower than its counterparts, its only disadvantage was the higher particulate matter emission. Anyway, some opposed-piston Diesel engines would be great for general aviation.
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Old 12-04-2016, 09:21 AM   #14 (permalink)
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The free piston linear generator looks to be the perfect solution for a range extended EV.
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Old 12-04-2016, 02:22 PM   #15 (permalink)
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Personally, I would like to see a terrhoidal engine... (The MYT) engine was an equivalent 800ci with a 15" diameter engine that weighed 150#... If it could be made to work, that is...
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Old 12-05-2016, 02:26 AM   #16 (permalink)
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Even though some "revolutionary" designs are highlighted once in a while, I wouldn't hold my breath for the free-piston or for any rotary engine by now. Apart from the ressurging of the opposed-piston layout, which had been highly favored by German aircraft manufacturers during the interwar period, there are other concepts such as the real Atkinson cycle and the Scuderi cycle that might become more relevant in the next years.
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Old 12-05-2016, 12:53 PM   #17 (permalink)
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The OP design claims it is 20% better than diesels - that is over 50% !! And they claim is is 50%+ better than the best gasoline, which is about 57% - which is clearly impossible; given the Carnot limit.
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Old 12-05-2016, 01:14 PM   #18 (permalink)
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You're talking about the linear generator? I suppose they could twist it to mean those percentages if they are talking the comparable electrical output. Either way, this is a brilliant design if nothing more than the packaging.
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Old 01-16-2017, 12:34 PM   #19 (permalink)
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This thing won't die

Now coming up under 37 mpg full size pickup.

Spec seems to be a 7 liter turbo motor.
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Old 05-23-2017, 02:17 AM   #20 (permalink)
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Achates already claims that at least one manufacturer is setting up the tooling to make an engine that follows its concept. I'd just hope they get a gear-driven compressor (or crankshaft-driven like the one fitted to the old Rootes TS3) instead of belt-driven in a production version.
At Least One Automaker Plans to Produce an Opposed-Piston Engine - Motor Trend

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