In this paper an experimental analysis is carried out to evaluate the dependence of the flow characteristics in the intake system of a high performance 4 valve, Spark Ignition Internal Combustion Engine, on the experimental conditions at the steady flow test bench. Experimental tests are performed at different pressure levels on a Ducati Corse racing engine head, to measure the Discharge Coefficient C d and the Tumble Coefficient N T , expanding the work already presented in a previous work by the same research group: with a new test bench, the maximum test pressure level is increased up to 24 kPa, while differently-shaped tumble adaptors are used to evaluate N t . The study is aimed at determining the influence of the test pressure on C d and N T measurements, and in particular of the tumble adaptor shape. As a matter of fact, researchers usually adopt different shapes, such as the conventional T type or the L one, resulting in a non uniform base to compare results from several investigations. This work is aimed at verifying the quantitative differences that can be found by using these shapes, in particular when the separate contribution to the tumble vortex generation from one only of two intake valves has to be evaluated. The above described analysis is also useful to evaluate the Cd values obtained in the different test conditions used.
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