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Displacement: 904 cc Bore: 92 mm Stroke: 68 mm Max. power: 75 hp at 7000 rpm Max. torque: 80 Nm at 5000 rpm Max. velocity: 220 km/h Pass-By noise: 82 dB(A) Homologation: 1992 Main Targets of Development Today’s motorcycle market requests more powerful engines, however, legislative noise and pollution limits are becoming more severe. In order to reduce development cost only small modifications were allowed. Entirely new designs of technical components (i.e. cylinder head) had to be avoided. In additon, the complete development had to be finished in a relatively short time of about three months. The most important targets of development were: better engine performance: – more max. power: +5 hp – more torque at low rpm lower noise emission: -2 dB(A) 80 dB(A) (89/235/CEE) change from carburettor to fuel injection system Figure 1, Ducati 900 SS
3 Engine performance calculation with WAVE A complete model of the new engine concept (fuel injection) with actual intake- and exhaust geometry allowed us to set up a reference engine-cycle-simulation model for further optimization. The most important parameter-variation during the cycle-studies to improve volumetric efficiency were: intake duct length valve timing constant or even lower exhaust backpressure Figure 2 shows the improvement in calculated engine performance due to different intake-duct length and modified valve timing. Figure 3 gives an example of accuracy of the calculation results compared with measured data of engine performance with new intake-duct length. Figure 4 illustrates the final engine performance with modified valve-timing, intake-duct length and new exhaust silencer. A comparison of measured performance data between the original and the redesigned engine gives shows the improvements in terms of maximum power and torque at low rpm.
DUCATI 900 SuperSport Engine performance And technical specification
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