Which of the following is NOT a requirement of an ignition system in a spark-ignition engine?

Explanation:

Requirements of an Ignition System in a Spark-Ignition Engine:

An ignition system is a critical component of a spark-ignition engine, designed to ignite the air-fuel mixture in the combustion chamber at the right time to ensure efficient combustion and power generation. The ignition system must meet several requirements to function effectively in a spark-ignition engine. These requirements include:

1. Timing the Spark: The ignition system must precisely time the spark to coincide with the compression stroke, ensuring that the air-fuel mixture is ignited when it is optimally compressed. Proper timing is crucial for maximizing the engine's power output and efficiency.
2. Generating High Voltage: The ignition system must generate sufficient voltage to jump the gap between the electrodes of the spark plug, creating a spark that can ignite the air-fuel mixture.
3. Maintaining Consistent Spark Duration: The ignition system must maintain a consistent spark duration across all engine speeds (RPMs) to ensure reliable ignition under varying operating conditions.
4. Reliability and Durability: The ignition system must be reliable and durable to withstand the harsh conditions inside an engine, including high temperatures, vibrations, and exposure to combustion by-products.

Mixing air and fuel in the intake manifold.

• This is NOT a requirement of the ignition system in a spark-ignition engine because the function of mixing air and fuel is performed by the carburetor (in older engines) or the fuel injection system (in modern engines). These components are responsible for preparing the air-fuel mixture and delivering it to the combustion chamber. The ignition system's role begins after the air-fuel mixture has already been prepared and compressed in the cylinder. Its primary function is to generate a spark to ignite the mixture, not to mix it.