A coolpower setup in a truck engine can use an aftercooler mounted on top of the engine with a tip turbine fan, or an air-to-air cooler in front of the radiator. In either case, the goal is to cool the hot, compressed air going from the turbocharger into the engine. With the tip turbine, a small quantity of compressed air is bled off to spin a small fan that draws air through the aftercooler tubes. In some later models, a water cooler was also used, in addition to the tip turbine setup. Mack called the tip-turbine setup an intercooler and used a pyrometer to alert the operator if the exhaust gas exceeded a limit. The tip turbine setup was compact and the shorter plumbing runs allowed boost to build faster. Later models with the front mounted air-to-air cooler required a larger turbocharger
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