Here's a breakdown:
* Improved Fuel Atomization: By warming the intake manifold, the coolant helps to vaporize the incoming fuel more efficiently. Colder fuel is less volatile and doesn't atomize as well, leading to incomplete combustion, reduced power, and poorer fuel economy. A warm intake manifold helps to preheat the air/fuel mixture, promoting better combustion.
* Enhanced Cold-Start Performance: This is a direct consequence of improved fuel atomization. On a cold morning, the engine needs more time to reach optimal operating temperature. Warming the intake manifold through coolant circulation speeds up this process, allowing for a smoother and more efficient start. This reduces the likelihood of hard starting, stalling, and excessive emissions during the warm-up phase.
* Reduced Intake Manifold Icing (In some cases): In certain climates or operating conditions, especially during high humidity and cold temperatures, ice can form in the intake manifold. Warming the manifold with coolant helps prevent this.
In short, while it adds a bit of complexity to the cooling system, the benefits of warmer intake air and improved fuel atomization significantly outweigh the drawbacks for the GM 350 and similar engines.
