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Combustion in reciprocating engines relies on in-cylinder gas motion to speed up the process and enhance burning efficiency. A number of factors capable of influencing such motion can be listed. Among the most important are intake port and piston top geometry. The latter normally referred to as combustion bowl shape is a subject of intense research activity in the Diesel field,in stark contrast to the mild endeavours prevailing in the Otto-cycle partisanship. However, today's environmental and energy resources availability considerations demand that cleaner and more fuel efficient engines have to be made available. Homogeneous mixture Otto-cycle powerplant improvements in fuel economy are hampered by knock incidence, among other factors. It is known that piston top features do interact with the combustion flame front in both negative or positive fashion. In order to better understand how sensitive this interaction is, four piston top shapes were tested in a 4-cyl.