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We’ve covered Elio Motors for some time now. Finally, we get to show you some video of the Elio 0.9-liter three-cylinder engine running on the dyno stand. After intensive studying of the Suzuki Swift/Geo Metro G10 three-cylinder engine — which had about 100 cc more displacement than Elio’s new engine, by the way — Elio said it made the decision to build its own engine because it was the best way to get an updated version of the small three-banger that would take into account Elio’s goals of a $6,800 MSRP for the whole car, the 84 MPG highway fuel economy rating, and the need to do zero-to-60 in less than 10 seconds while topping out somewhere north of 100 MPH. We covered that decision twice, here and here. Michigan based Ecomotors was founded in 2008 by Professor Peter Hofbauer who first began working on opposed-piston opposed-cylinder (OPOC) engines in 2003. Mr. Hofbauer is a career innovator with over 50 patents relating to advanced powertrains, combustion technologies and control systems. He was responsible for the creation and development of the first Volkswagen diesel engine.  Since inception, Ecomotors has taken in just over $58 million from Braemar Energy Ventures, Khosla Ventures, and  even Bill Gates who made his first investment in Ecomotors in 2010. He even blogged about his investment here.

OPOC Engines
The fuel economy of any engine is affected by friction, that is when metal engine parts are rubbing against each other at high speeds and over long periods of time. If you can reduce friction, you can dramatically improve the fuel economy of an engine. In all engines, there is a practical limit to piston speed above which engine performance begins to suffer from increasing friction. Piston speed is related to the distance the piston must travel. In an OPOC engine, each piston travels about half the distance of a piston in a conventional engine

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The video itself is scant on details. We see and hear the engine running on the dynamometer. There’s an inset shot of technicians sitting at the controls viewing the horesepower and torque graphs. Unfortunately, the small inset video doesn’t allow us to see real-world horsepower or torque numbers on the engine, but Elio has frequently said it’s shooting for a zero-to-60 MPH acceleration time of “less than 10 seconds,” and the company hangs its marketing hat on a claimed 84 MPG highway, so we wouldn’t expect much more than 50 horsepower.

But enough about that. Here’s video of the engine running on the dyno. We happen to think it sounds pretty good, if prone to get a bit buzzy and annoying on extended highway runs. But we realize it’s likely unmuffled at this point in its development, so we’ll reserve final judgment of the engine’s sound and demeanor until we hear one in full production spec with a production muffler attached.

Elio Motors’ blog entry about the milestone was not verbose. As we covered in these pages previously, Elio said it was the first start-up automotive manufacturer in some 60 years to build its own engine from scratch. That previous announcement had targeted a public start-up date of Monday, Feb. 6 for the engine — a target Elio missed by just over a month, revealing the video to the public Monday, March 6.

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