23 Sep '14, 12pm

#electricvehicle Official: Elio getting closer to building actual 84-mpg cars

Regarding the development of their own engine. Look at the specs. It's a 3 cylinder, 0.9 liter, with only 55 HP. That's not a lot of displacement, but even for it's displacement, it's a very low power density. The power density is 61 hp/liter (I know I'm mixing metric with imperial, just deal with it) which is much lower than most engines out there, especially the smaller ones. It's much closer to the energy density of the engine in the Prius, 1.8 liter and 98 hp for 54 hp/liter. I suspect that Elio is developing a Prius like Atkinson cycle tuned engine. They haven't said so, but I'd bet on it. This kind of engine is normally reserved for hybrid duty, but since the Elio is so light, it can be propelled with such low power. This type of engine is also very mechanically simple, not needing a turbo, direct injection, probably not even VVT, so, once you invest in its developme...

Full article: http://green.autoblog.com/2014/09/23/elio-getting-closer-...

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