How much air is required to burn 1 liter of diesel in old diesel engines?

To burn 1 liter of diesel fuel, approximately 14 to 15 liters of air are required in old diesel engines. This ratio can vary based on the engine's efficiency and operating conditions, but a typical air-to-fuel ratio for diesel combustion is around 14.5:1. The combustion process depends on adequate air supply for complete fuel oxidation, ensuring optimal engine performance.