What is the impact of spark plug gap size on the performance of automotive engines?

1. Ignition energy and stability
Excessive gap:
The arc length becomes longer, resulting in a decrease in ignition energy.
May cause engine misfire, affect power output, and make acceleration weak.
During the operation of the engine, there may be instances of misfiring or missing cylinders, which can affect the smooth running of the engine.
Higher pulse ignition voltage is required, which may lead to insufficient fuel combustion and exacerbate exhaust pollution.
Gap too small:
An increase in arc energy may cause detonation and increase noise levels.
Insufficient combustion during ignition can lead to power loss, resulting in unstable idle and insufficient power.
May cause difficulty in starting the engine, and even prevent it from starting in extreme situations.

2. Fuel economy
Whether the gap is too large or too small, it may lead to insufficient fuel combustion, thereby increasing fuel consumption and reducing fuel economy.

3. Engine lifespan and maintenance
Poor ignition or insufficient combustion can lead to issues such as carbon buildup and electrode erosion in spark plugs, accelerating their aging and damage.
Regular inspection and replacement of spark plugs are necessary to ensure the normal operation of the engine and extend its service life.

4. Adaptability and Adjustment
The adjustment of spark plug clearance should consider the fuel type and engine operating conditions. For example, engines using high octane fuels may require larger spark plug clearances to accommodate higher ignition pressures.
Reducing the gap appropriately in high-altitude or high-temperature environments can improve ignition reliability.
The adjustment of spark plug clearance requires the use of professional tools, such as spark plug clearance adjustment wrenches, and adjustments should be made within the specified range.