Abstract
The basic arguments which led to the choice of a framed crankcase structure for a new range of in-line and Vee engines is described. The underlying principles behind the evolution of the actual design are discussed in relation to criteria for strength, stiffness, manufacturing procedure, and noise reduction.
The relative merits of underslung crankshaft and bedplate types of structure are discussed, and the programme of model and prototype testing which led, together with manufacturing considerations, to a decision between the two is described. Extensive model and prototype testing, in conjunction with theoretical analysis, was used as a major design tool and to prove the design. This is described in some detail and comparative results presented and discussed.
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