Bearings

Bearings are one of the most important parts in any engine, even though they rarely get the same attention as pistons, connecting rods or camshafts. They have a crucial function in the engine’s moving parts because they reduce friction, support rotating components and help ensure correct oil control under load. Without properly functioning bearings, even an otherwise strong engine build can quickly develop serious problems with wear, heat and in the worst case total failure.

In engines, there are several different types of bearings, each with its own function. Main bearings are used around the crankshaft and support the crankshaft itself in the engine block. Connecting rod bearings sit between the connecting rod and crankshaft and work under very high load, especially in engines with high RPM or high boost pressure. Camshaft bearings are used to support the camshaft and ensure correct rotation and lubrication in the engine’s valvetrain. Depending on the engine design, there may also be other bearing types that play an important role in the overall setup.

Bearings are used in standard engines, rebuilt engines and more demanding performance and motorsport engines alike. In connection with engine rebuilds, it is completely normal to replace bearings to ensure correct fitment, oil pressure and durability, while in performance engine builds, upgraded or racing-oriented bearings are often chosen, developed for higher loads. This is especially relevant in projects with increased power, changed internal engine geometry, higher RPM or more demanding use on track, strip or under hard street driving.

The choice of bearings is not only about size, but also about quality, tolerances, materials and how the rest of the engine is built. The right set of bearings must match the engine’s dimensions and intended use precisely, and in serious engine projects, correct measuring and assembly are critical. Good bearings are not a glamorous part, but they are absolutely central to the engine’s service life, stability and ability to withstand load over time.