Studying diesel engine emissions. Researcher analysing the emission of carbon nanoparticles from a 1910 JTD common rail diesel engine. Engines must comply with emissions standards before they can be installed in vehicles. Excess emissions can be harmful to health and the environment. Diesel engines rely on compression for the ignition of fuel, rather than using a spark plug. Diesel engines are more efficient than spark ignition engines, although they are heavier and the power output is typically lower. Photographed at the Italian National Research Council in Naples, Italy.
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