Comp Turbo Technology, Inc. has continued its practice of innovative turbocharger improvement by being the first to develop an air-cooled turbocharger model, an important addition to the existing product line.The new air-cooled model turbocharger eliminates the traditional water lines connected to and from the engine. Cooling air can be admitted to the cooling jacket in the turbocharger bearing housing from several sources, as follows:The temperature of the air that exists behind the compressor wheel will reach a level that is approximately half the total temperature rise of the compression process since only half of the total pressure rise occurs in the compressor wheel. The other half occurs in the stationary diffuser section, outboard of the compressor wheel. For example, if the temperature of the compressed air leaving the compressor casing is 300°F, then the air behind the compressor wheel will be approximately 150°F, which is low enough to be used as a cooling media. A small drilled hole leading from the space behind the compressor wheel into the cooling jacket in the bearing housing will admit the 150°F cooling air into the cavity that previously used cooling water from the engine. The amount of cooling air will increase as the speed of the turbocharger increases since the pressure ratio developed by the compressor increases.In addition to the small drilled hole, a pressure relief valve can be located in the bearing housing with a spring selected to admit cooling air from behind the compressor wheel into the bearing housing cooling jacket when the compressor pressure ratio reaches a predetermined level. This arrangement will then bleed a larger amount of cooling air into the cooling jacket.Alternately, If it appears advantageous to keep the turbocharger unaltered, the cooling air can be bled from the intake manifold system at a location downstream of the aftercooler where a large portion of the heat of compression has been removed. Here again, a pressure relief valve can be used with a spring selected to open the valve at a predetermined pressure ratio.Since the air-cooled turbocharger eliminates the water lines used with traditional water cooling, it can be combined with the Comp Turbo oil-less turbo, which has eliminated the traditional lube oil lines from and to the engine, making the turbocharger independent and can be mounted in a variety of locations and positions on the engine.Comp Turbo Technology, Inc. has again taken the lead in extending the boundaries of small turbocharger technology by providing their customers with a new and exciting turbocharger feature that enables them to lower turbocharger installation costs by eliminating water and oil lines.

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