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by bunlee on September 14th, 2006

bunlee

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Which is more fuel efficient, the V-engine, boxer, rotary or conventional engine?

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  • by 8 Jan 2004-10 Dec 2009 on October 4th, 2006

    8 Jan 2004-10 Dec 2009

    First off, there is no "conventional" engine. I assume you mean Inline, as the inline-4 is the most common engine around at the moment.

    Rotaries are not the best at sealing the conbustion chamber, though the current RX-8's Renesis is a huge improvement over the 13B in the old RX-7, which is vastly better than the 12B in the first-gen RX-7. As a result, their fuel economy is relatively poor. OTOH, a 1.3-liter two-rotor rotary is the equivalent of a 2.6-liter V-6, so it's not as bad as you'd think.

    As for the other engine types, the cylinder layout by itself doesn't affect fuel efficiency. However, most of the Boxer engines I can think of are in performance cars (Porsche, WRX STi) where ecomony isn't so important, and most V-engines are large 6- or 8-cylinders, which is less fuel-efficient than a smaller I-4.

    Therefore, inline engines are generally more fuel-efficient, but not for the reasons you'd think. It's not the cylinder layout that matters. It's just that most inline engines on the road are non-turbocharged, low-compression engines of less than 2 liters displacement.
    Adding compression, turbos, and/or displacement will nullify this, so don't expect good gas mileage from an RB26DETT just because it's an Inline engine; it's a twin-turbo 2.6-liter 6-cylinder engine used in a sports car (the Nissan Skyline to be more specific).

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