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Swedish automaker Volvo says it will take the "next step towards zero emissions" with the 2011 Frankfurt Motor Show unveiling of downsized four-cylinder gas and diesel engines. Peter Mertens, Volvo's senior vice-president of research and development, claims:

Engine downsizing is considered an effective method to reduce emissions and improve fuel efficiency. The basic concept is simple: replace a larger engine with something that displaces less and, typically, packs a turbocharger to make up for any lost power. One impediment to engine downsizing is low-speed preignition (LSPI). Preignition occurs when the combustion chambers ignites prior to the spark event. This causes advanced combustion timing which can lead to heavy engine knock and catastrophic

2011 Bentley Continental GT – Click above for high-res image gallery

2010 Mini Cooper 50 Camden Edition – Click above for high-res image gallery

PSA Peugeot Citroën has announced that it will spend €175 Million to tool up one of its engine plants to build a new turbocharged inline three-cylinder engine. The Douvrin engine plant will have a capacity of 320,000 units per year starting in early in 2013. The 1.2-liter engines will join a normally aspirated version that debuts one year earlier.