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Balancing of the crankshaft to minimize bearing loads is a critical concern in the design of multicylinder engines, especially high-speed racing engines. In this paper a numerical model is developed for the crankshaft-connecting rod-piston assembly that considers reciprocating forces as well as gas pressure forces. The model is used in an optimization scheme to design crankshaft counterweights which minimize main bearing forces. A V-8 NASCAR engine is analyzed. The results indicate reductions in average bearing force of as much as 73% while peak force is reduced as much as 41%.

For eight years, in conjunction with the General Motors Corporation, a graduate program in motorsports research and education was developed at North Carolina State University. This program sought to favorably impact the General Motors racing program with the application of advanced technology and to use motorsports as a vehicle for training engineering students. Faculty and students were involved with NASCAR Winston Cup, Indy Car, and NHRA Pro-Stock drag racing. This paper details the accomplishments of the program.