<div class="htmlview paragraph">Technical information on the development of a new Lombardini prechamber diesel engine family, called FOCS, is given.</div> <div class="htmlview paragraph">Market requirements in terms of high performance, low fuel consumption, light engine weight and low noise and pollutant emissions have been met.</div> <div class="htmlview paragraph">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.</div> <div class="htmlview paragraph">Comparison of performance and emissions between FOCS 602 and competitive engines nowadays available on the international market is reported.</div>