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PDF Audi S4 2 7 litre V6 Turbocharged engines Manual

Audi S4 2.7-litre V6 Turbocharged engines Manual. Turbocharged engines are already something of a tradition at AUDI. The task now facing AUDI’s engineers was to develop a worthy successor to the 5-cylinder turbocharged engine. One of the key development goals for the turbocharged engine was to achieve a good level of dynamic response, particularly at the bottom end of the rev band. a further milestone in engine development by Audi! The goal of AUDI’s engineers was to realise a high “basic torque level“ and a torque characteristic that rises in direct proportion to engine speed to its peak. Technical data, crankshaft, cylinder head, camshaft timing, cooling circuit, engine lubrication, overview of components, air ducting, charging, exhaust system, pneumatically controlled systems, charge pressure control, air divert control in overrun, ACF system, crankcase breather. The cylinder heads are largely identical to those used in the V6 naturally aspirated engine. Common parts are used for both banks of cylinders. The mounting position of the right-hand cylinder head is rotated through an angle of 180° in relation to the left-hand cylinder head. The timing of the inlet camshafts is engine dependent. To improve heat dissipation, the exhaust valves are sodium-filled. Cooling circuit Both exhaust gas turbochargers are water cooled and integrated in the cooling circuit. When the coolant thermostat is closed, the coolant flows back to the coolant pump along the short-circuit line as well as the heat exchanger. When the coolant thermostat is open, the coolant flows back to the coolant thermostat through the radiator (primary flow) or through the oil cooler and expansion tank (secondary flow). Located in the cooling circuit is a electrical coolant pump. This pump is required as a means of protection against overheating of the coolant under high thermal load, e.g. when the hot engine is turned off.


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