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Development of Reciprocating Parts and Crankshaft in Honda’s Third Formula One Era

Article of Honda R&D Technical Review F1 Special (The third Era Activities)

Summary

Reciprocating parts and crankshafts for race use must display reliability and achieve low friction levels. Increasing engine speed is an effective method of increasing the power of natural aspiration engines, and Honda increased engine speed to 19,600 rpm in 2006, prior to the introduction of upper limits for engine speed. In 2005, Formula One regulations were changed to increase the distance for which engines would be used from one race event (400 km) to continuous use for two race events (1,500 km). In order to balance performance under severe use conditions with the achievement of reduced friction, the shapes, materials, and manufacturing methods used for the reciprocating parts and crankshaft were modified to reduce weight and increase strength and stiffness. In FY2008, the weight of the reciprocating parts was reduced to 358 g, representing a weight saving of 41 g against the FY2000 figure of 399 g. This paper will discuss the development process, focusing on each component part.

Author (organization or company)

Tetsuo GOTOU(Automobile R&D Center)、Nagao YANAGISAWA(Automobile R&D Center)

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