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Old 12-16-2016, 11:45 AM   #11 (permalink)
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I fail to see how Pinnacle motor is any different than any other flat engine.

The design was create in 1896 and is used today in a few cars such as Porsche and Subaru https://en.wikipedia.org/wiki/Flat_engine#Current_users

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Old 12-16-2016, 11:55 AM   #12 (permalink)
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Opposed piston is not the same as flat.
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Old 12-16-2016, 12:23 PM   #13 (permalink)
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A flat engine like my old Corvair has pairs of pistons with the crankshaft between them. The Pinnacle has two pistons crown to crown in a common bore each attached a separate crankshaft.
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Old 12-16-2016, 05:57 PM   #14 (permalink)
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Originally Posted by solarguy View Post
An interesting idea that crops up every so often. The brits had this fantastic sounding 3 cylinder, 6 piston, 2 stroke diesel engine locomotive, with a bunch of turbos. It sounds fantastic.

Pollution was problematic, so they went away.

Here's a model that illustrates how it works:




Here's a video that really captures the sound of the Napier Deltic engine:



Sometimes known as the whistler engine.
IIRC there are still some Royal Navy vessels fitted with Napier Deltic engines. The main disadvantage in those older 2-stroke opposed-piston Diesel engines had been the particulate matter emissions much like any other 2-stroke Diesel with a more conventional design such as the Detroit and EMD ones, while other emissions such as NOx could be actually lower like in the Rootes TS3 engine used in some Commer trucks and buses. Nowadays with a higher cetane rating of the fuel and more accurate injection controls available, this issue might be easier to overcome.

Last edited by cRiPpLe_rOoStEr; 12-16-2016 at 06:02 PM..
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Old 12-16-2016, 10:31 PM   #15 (permalink)
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We had these for back up power on our Nuke Subs, Fairbanks Morse 68 8 1/8 ND. I went to school to learn how to work on em. You'd have a hard time getting one in a Honda, since it's bigger than a Buick and weighs 60,000 lbs or so. It would likely overtax the suspension.....
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Old 12-16-2016, 11:40 PM   #16 (permalink)
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Old 12-18-2016, 04:05 AM   #17 (permalink)
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We had these for back up power on our Nuke Subs, Fairbanks Morse 68 8 1/8 ND.
IIRC they're still used in some military vessels, and now there are dual-fuel Diesel/Natural Gas versions available for use in powerplants.
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Old 12-23-2016, 09:16 AM   #18 (permalink)
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Originally Posted by cRiPpLe_rOoStEr View Post
The last news article was Forbes mid-2015.

The website is lacking basic information, so I went to Google images.

Next Big Future: Pinnacle Engines opposed-piston engine could have 30-50% more efficiency by 2013


https://dreamer3000.wordpress.com/op...nacle-engines/



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Silicon Valley Firm Pinnacle Working on Classically Insane Opposed-Piston Engine | Car and Driver Blog


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Old 12-24-2016, 05:35 PM   #19 (permalink)
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The website is lacking basic information
That's what made me quite skeptical about their business plan. Their technology seems to be reasonable, but the lack of information might turn possible investors away.
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Old 12-25-2016, 07:26 AM   #20 (permalink)
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how smooth is this design, anyway?

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