What Does An Air Cooler Do in A Marine Engine?

What function does an air cooler serve in a marine engine?

What exactly is a charge air cooler?

A charge air cooler is used to cool engine air after it has been compressed by a turbocharger but before it enters the engine.
This is their primary role. The goal is to cool the air so that the combustion process within the engine produces the most power.
It is a heat exchanger used in turbocharged and supercharged (forced induction) internal combustion engines to improve volumetric efficiency by increasing intake air-charge density by isochoric cooling.
A lower air intake temperature gives the engine a denser intake charge and allows more air and fuel to be combusted per engine cycle, improving engine performance.

The charge air cooler is intended to chill the charged air from roughly 180°C to 220°C down to around 40°C. This is accomplished by the use of cooling water.
The size of the charge air cooler varies depending on the engine. The smallest are intercoolers, which are typically linked to vehicle or truck engines. The largest are frequently seen on massive marine diesel engines or in power plants. In these conditions, they can weigh many tonnes.

Vrcooler also makes specialized air coolers for gas engines.
The term "charge air cooler" refers to anything that cools the turbocharged air before it is delivered into the engine.