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Engine

Crankshaft

The main rotating shaft that converts reciprocating piston motion into rotational torque for the drivetrain.

Definition

The crankshaft sits at the bottom of the engine block and receives force from connecting rods.

Counterweights, rod journal sizing, and stroke length all influence balance, rpm capability, and displacement.

Related terms

  • PistonA cylindrical component that moves up and down inside the cylinder, transferring
  • CamshaftA shaft with lobes that open and close intake and exhaust valves at precise timi
  • Cylinder HeadThe top section of the engine housing valves, ports, and often the combustion ch
  • Engine BlockThe main structural casting that houses cylinders, crankshaft bearings, and ofte
  • ValvetrainThe assembly of valves, springs, retainers, rockers, and camshaft that controls
  • Timing BeltA toothed belt synchronizing crankshaft and camshaft rotation in many overhead-c

Category: Engine · Updated August 31, 2026