What Are Breaker Points?
Breaker points, also known as contact points, are a mechanical switch used to control the timing of the ignition spark in older vehicles. They consist of a pair of electrical contacts that open and close in synchronization with the engine’s rotation, allowing the ignition coil to produce a high-voltage spark needed to ignite the fuel-air mixture.
How Do Breaker Points Work?
- Opening and Closing Cycle: The breaker points are actuated by a cam attached to the engine’s distributor shaft. As the cam rotates, it pushes the breaker arm, causing the contacts to open and close.
- Inducing Voltage: When the points close, current flows through the primary winding of the ignition coil. As the points open, the sudden interruption of current creates a high voltage in the secondary winding, which then delivers a spark to the spark plugs.
- Condenser Role: A capacitor (or condenser) is connected in parallel with the breaker points to prevent excessive arcing, which can lead to wear and reduced efficiency.
Why Were Breaker Points Replaced?
Despite their reliability, breaker points have several drawbacks:
- Wear and Tear: Mechanical contact leads to gradual wear, requiring frequent maintenance and adjustments.
- Limited Efficiency: As engines became more powerful and efficient, the need for precise ignition timing became crucial, which breaker points struggled to provide.
- Electronic Ignition Systems: The introduction of transistorized and computerized ignition systems eliminated the need for mechanical contacts, improving performance, reliability, and reducing maintenance costs.
Breaker points played a vital role in the evolution of automotive ignition systems, but they have largely been replaced by modern electronic alternatives. Understanding their function provides insight into automotive history and how ignition technology has progressed over time.
