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Trucks usually use air-to-air charge-air coolers (also called aftercooler or erroneously, intercooler). If it has an intricate structure of aluminum "turbulators" in the charge-air tubes which transfer heat to the outer structure so it can be removed by outside air, they are efficient. A good...

Here is some basic diesel info for those coming from the gas world or just not familiar with diesels. They are the opposite of a gas engine in that more fuel = more power and heat. You turn up the fuel to get power, and it will run hotter and smoke more. With a gas engine, more fuel makes it...