What could happen if too much oil is allowed to enter the combustion chamber before ignition?

If too much oil enters the combustion chamber before ignition, it can lead to a situation where the oil accumulates and does not ignite as intended. This excess oil can create a rich mixture, resulting in a significant amount of unburned fuel. When ignition does occur, this excess fuel can lead to a rapid and uncontrolled combustion process, sometimes described as a "flashback" or "backfire." This uncontrolled burn might produce excessive heat, leading to operational hazards, including potential damage to the furnace and risk of fires due to the intense flames and heat.

Additionally, this scenario could produce high levels of carbon monoxide, a dangerous gas, as the incomplete combustion of the excess fuel takes place. Proper calibration of the oil supply and a well-maintained burner are essential to prevent such occurrences and to ensure safe and efficient operation.