What is the difference between lean and rich fuel mixtures?

A lean fuel mixture is characterized by having a higher proportion of air compared to fuel. This definition is fundamental in understanding how engine performance is affected by the fuel-air ratio. When there is more air in relation to the amount of fuel, it results in a lean condition which can enhance fuel efficiency and reduce emissions. However, while a lean mixture can optimize certain engine conditions, it may also lead to increased temperatures and potential knocking in some cases.

In contrast, a rich fuel mixture contains more fuel relative to air. This can create a more powerful combustion but may result in unburned fuel and higher emissions. Recognizing the balance between these two mixtures is crucial for effective engine operation and performance management. Understanding these distinctions is important for anyone involved in aircraft operations and maintenance to optimize engine performance and prevent damage from improper fuel mixtures.