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This paper presents results of an analytical comparison between two alternative versions of a crankshaft for a 2.2L gasoline engine. The first version had 8 counterweights and a bay balance factor of 80.3%. The second had 4 (larger) counterweights giving a bay balance factor of 56.6% and a crankshaft mass reduction of 1.42 kg. The results presented in this paper relate to the main bearings in terms of specific loads, oil film thickness and shaft tilt angle under full load and no load conditions across the speed range. Torsional vibration analysis and crankshaft stress analysis were also performed but the results are not presented here. The differences in bearing force and oil film thickness were very small and the only major difference in terms of shaft tilt angle occurred at Mains 2 and 4 (increase of ∼ 20% compared with 8 counterweight version).

This paper describes the design and analysis of a lightweight crankshaft for a high speed racing motorcycle engine. It covers the evolution of the crankshaft from the baseline, with rated speed of 14000 rpm, to the final design with rated speed of 16000 rpm. The lightweight crankshaft is compared with the baseline design in terms of the following criteria. Balance Mass and rotating inertia Main bearing loads and oil film thickness Torsional vibration Stress and fatigue safety factor

This paper describes the design and development of a direct acting valve train for high speed operation in a racing motorcycle engine. At the outset of the project the engine speed limiter was set to 14000 rpm and this was eventually raised to 16000 rpm. The paper covers the evolution of the design and includes descriptions of the components including camshaft, tappet, shim, retainer, valve and valve springs. Valve train dynamic analysis software was used for the following tasks. Assessment of the influence of the changed parts on valve train dynamics and durability Design of new cam profiles Setting speed limit for each build level Investigation of failures These activities are covered in this paper.