The widest lobe on a three lobe per cylinder camshaft is for __________ operation.

The widest lobe on a three lobe per cylinder camshaft is designed for injector operation, primarily because it is intended to optimize fuel delivery timing and duration in relation to the engine cycle. The injector lobe is crafted to facilitate the precise opening and closing of the fuel injector, ensuring that fuel is delivered into the intake manifold at the exact moment when the cylinder is ready to receive it. This timing is crucial for efficient combustion, contributing to the overall performance and efficiency of the engine.

The specific profile of the injector lobe allows for necessary adjustments to the fuel injection timing, which can vary according to engine speed and load conditions. By having a wider lobe, the injector system can ensure a more extended period of injection, enabling better fuel atomization and mix with incoming air, which enhances the combustion process.

In contrast, the other lobes, such as those for intake and exhaust, are primarily focused on the valve timing and lift characteristics necessary for air intake and exhaust gas evacuation. Their designs cater to the physical requirements of opening and closing valves rather than the specific dynamics of fuel injection. Thus, while those lobes are crucial for the overall engine function, the injector lobe’s width is specifically tailored to maximize the efficiency of fuel delivery.