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Technical information on the development of a new Lombardini prechamber diesel engine family, called FOCS, is given. Market requirements in terms of high performance, low fuel consumption, light engine weight and low noise and pollutant emissions have been met. The engine family consists of 2, 3 and 4 cylinder models with 72 mm cylinder bore and with two stroke-length (62, 75 mm) version covering 505 cc, 611 cc, 916 cc and 1222 cc displacement. Comparison of performance and emissions between FOCS 602 and competitive engines nowadays available on the international market is reported.