Mazda has developed a new, naturally aspirated MZR 1.3L Miller-cycle engine for the redesigned Demio (exported as the Mazda 2) which goes on sale in Japan in July 2007. The engine delivers up to a 20% reduction in fuel consumption.
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Combined with the automaker’s first continuously variable transmission (CVT), the new engine can achieve fuel economy of 23.0 km/litre, an improvement of approximately 20% over the 19.2 km/l rating of the current model.
Developed from the current MZR 1.3L DOHC aluminum engine, the naturally-aspirated Miller-cycle engine employs delayed closing of the intake valves in order to reduce pumping losses and improve thermal efficiency through a higher expansion ratio.
Intake valve timing is optimised by a sequential valve timing system to provide improved fuel efficiency over the current MZR 1.3L engine when cruising and accelerating.
Mazda said the combination of the engine with the CVT allows the transfer of torque at low speeds without power loss and eliminates gear-shift shock, achieving excellent fuel efficiency and a smooth ride.
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By GlobalDataReducing the weight of the redesigned Demio by 100kg has also helped improve fuel economy.
The new car achieves a fuel economy that is rated as 20% or better than the level specified by Japan’s 2010 fuel economy standards.
Exhaust emissions are also at least 75% lower than 2005 standards, and conform to Japan’s Super Ultra-Low Emissions Vehicle (SU-LEV) standard, qualifying the latest Demio for ‘green tax’ exemptions.
