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Nissan say the Primera's success is down to a swirl control valve in the engine's inlet tract. This was a feature previously reserved for diesel-engined vehicles. The new 1.8-litre engine was among the first petrol engines to adopt the system. The valve is closed during warm-up and at low engine speeds, redirecting the air flowing through the inlet ports. The re-routed airway increases tumble swirl in the combustion chamber to enhance combustion for improved emissions and reduced fuel consumption (oh no please don't compare this to a diesel)
2003 Honda Accord
4-cylinder, 2.4-liter internal combustion engine
160-hp, 24/33 mpg city/highway (automatic transmission)
CA SULEV/"Zero Evaporativge Emission" fuel system
The first high-volume, near-zero emission vehicle on sale in the U.S.