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Joint Face Design

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Last month we looked at some of the aspects concerning the design of the big end and this month we pick up with further aspects of this critical area, namely those concerned with the joint faces. The big end joint is an important area of rod design, as it affects the durability of the rod bolts. If there is a problem with this joint, it will surely lead to a catastrophic engine failure – it would be a real surprise to find a loose rod bolt with no significant damage found elsewhere....

Big End Design

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After the article last month which looked briefly at the small end of the con rod, we shall look this month at the opposite end of the con rod. Referred to as the ‘big end’ or ‘large end’ this end of the con rod houses the bearings which transfer the piston and con rod loads to the crankshaft. Again we shall concentrate on the type of con rod found in the four-stroke engine typical of Formula One and many other racing series. One of the main jobs that the big end has...

Small end design features

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The con rod has a number of important design features and many of these are associated with the design of the small end. The primary function of the con rod is, of course, to transmit the power of the reciprocating motion of the piston to the rotating crankshaft. In this article we shall consider some of the design features of the small end of a modern four-stroke racing con rod and the different solutions to the various problems which must be overcome. The small end must provide...