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General description new engines models L8, LF, L3
| Fig. 2.1. The diagram engine performance of Mazda 3
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On the set of Mazda 3 modern engines of the new generation with improved dynamic and maintainable harakteristikmi. Engine L8 - working volume of 1.8 liters, max. power - 88 kW (120 hp) max. cool. moment - 165 Nm / 4300 min -1 top speed of 197 km / h. Engine LF - a working volume of 1.8 liters, max. power - 104 kW (141 hp) max. cool. moment - 181 Nm / 4100 min-1, which develops a maximum speed of 208 km / h. Engine L3 - working volume of 2.3 liters, max. power - 122 kW (166 hp) max. cool. moment - 207 Nm / 4.000 min -1, which develops a maximum speed of 214 km / h. L3 engine may be equipped with a turbocharger - a system Sequential Valve Timing (S-VT). The principle of operation of the turbocharger is a turbocharger that operates the actuator by the energy of the burnt exhaust gases. The compressor consists of two axial impellers. Hot exhaust gases enter the housing of the turbocharger, where unwind operation (first) wheel speed to 100 000 min -1. Impeller, in turn spins the shaft through the second impeller, which pumps the air compressor and delivers it into the combustion chamber. Passed through the turbocharger cooled air heated in the radiator intake air. That cooling permits a large increase in power (Fig. 2.1).
| Fig. 2.2. General view of the engine of Mazda 3
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Mazda has introduced a number of technical improvements in the design and technical components of the new engines. For example, the engine of model L3 applied variable valve timing mechanism. In order to reduce the overall weight of a vehicle engine block is made on new engines as well as the cylinder head from an aluminum alloy. Big changes have been made in the structural and mechanical part of the engine to reduce vibration and noise. For example, in the engine models used L3 balancing mounted cassette. All engines now installed silent timing chain drive mechanism. The cylinder block is provided with a long skirt piston and integrated main bearing caps. In addition, all engines used crankshaft pulley with torsional vibration damper and suspension pendulum. Simplified in order to improve maintainability, the circuit accessory drive belt. Now use one belt for all ancillary engine units. The tension of the drive belt tensioner is adjusted automatically. Cover the front of the engine has an opening for maintenance (to unlock the ratchet and adjust the chain tensioning lever lock). As the power plant in Mazda 3 uses 4-cylinder engines in which the cylinders are arranged in a single row. Bottom drive tray is closed, forming a housing, which is also the reservoir for the oil needed for lubrication, cooling and protection of engine parts from wear. All three 16-valve engine with four valves per cylinder. The valves are actuated by two camshafts located at the top through bucket tappets. Engine lubrication provides oil pump, mounted on the front side of the housing and driven by the crankshaft. The oil is sucked from the oil pan is supplied through the holes and channels to bearings of the crankshaft and camshaft and the cylinder surface. Preparation and submission of the air-fuel mixture carries an electronic engine management system that does not require maintenance.
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