Quick Scoop

A camshaft is a rotating shaft in an engine that opens and closes the intake and exhaust valves at the right time. It helps the engine “breathe” properly, which affects power, fuel economy, and emissions.

How It Works

As the camshaft turns, its lobes push on valve parts like lifters or rocker arms, making the valves open and close in sync with the engine’s cycle. In a four-stroke engine, the camshaft turns at half the speed of the crankshaft.

Why It Matters

  • It controls when air and fuel enter the cylinder.
  • It controls when exhaust gases leave the cylinder.
  • Its shape and timing affect performance, efficiency, and smoothness.

Simple Example

Think of it like a timed switchboard for the engine’s valves: if the timing is right, the engine runs efficiently; if it’s off, performance drops.

If you want, I can also explain camshaft vs crankshaft in one easy comparison.