Precombustion Chamber

The precombustion chamber of a diesel engine is a small cavity, much like the combustion chamber, only it is contained within a small area. It allows a preignition state to exist. Once the fuel in the precombustion chamber ignites, it can then ignite the fuel- air mixture in the combustion chamber itself. In cold weather, the precombustion chamber enables diesel engines to start more readily, since the glow plug can easily warm the small volume within it. Under normal operating conditions, the precombustion chamber allows a lean mixture to be used, because it concentrates and ignites it within the precombustion chamber before it disperses into the combustion chamber.