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Sports cars are fast and fun. Truth be told, they're also usually a purely selfish indulgence. Their powerful engines are often gas-guzzlers, less than friendly to the environment. And they're typically two-seaters, making them of little use to friends and/or family who may be longing to come along for the ride. Mazda has created a kinder, more generous sort of sports car. The Concept RX-8, the company's thinly veiled future flagship vehicle, seats four and boasts an engine that's both powerful and fuel-efficient.
Powering the RX-8 is a 1.3-liter 250-horsepower rotary engine. Mazda has had 40 years of experience producing rotaries and is the only manufacturer in the world that offers a pure rotational internal combustion engine. The RX-8's engine -- dubbed the Renesis -- is a new type of rotary, similar to the one that was offered in Mazda's RX-7 (last sold here in 1995), but with a few significant improvements. It makes almost as much power as the RX-7's turbocharged engine (with power levels up to 250 horsepower at 8,500 rpm), but is 30 percent lighter and more compact. Unlike previous rotaries, which used side exhaust ports and peripheral intake ports, the naturally aspirated Renesis has intake and exhaust ports in the side housings; this configuration eliminates overlap between the opening of the intake and exhaust ports, improving combustion efficiency and permitting the engine enhanced fuel economy and reduced emissions. And compared to the RX-7's rotary, the engine's intake ports open sooner, and its exhaust ports open later, resulting in a longer power stroke and improved heat efficiency. Backing the Renesis is a six-speed automanual transmission.