Tuesday, August 9, 2011

Audi A5, new gasoline engine

The Audi A5 launches a new gasoline engine. 1.8 TFSI is the redesigned, with which the brand achieved an output of 170 hp and reduces the average consumption of 5.6 liters of fuel per 100 kilometers, 21% less than the previous version. This engine 1.8 TFSI is the top of the range of four-cylinder engine and operated with a manual transmission gets an acceleration from 0 to 100 km / h in 7.9 seconds, reaching a top speed of 230 km / h.

It offers 170 hp and a torque figure of 32.65 mkg, which is delivered between 1,400 and 3,700 rpm. As mentioned above, has an average consumption of 5.6 liters per 100 kilometers, placing the CO2 emissions to 134 grams per kilometer. The new 1.8 TFSI engine for Audi A5 uses a system that injects fuel at the tail end of the intake manifold near the drop point of the valves, which intensively swirled in the air.

The indirect injection was used in the phases of partial load and thus reduces fuel consumption and particulate emissions to the extent that the four-cylinder engine already meets the limits established for future Euro 6 standards, which shall enter into force by 2015, according to Audi engineers say.

The system pressure in the FSI has been increased from 150 to 200 bar. The direct injection system is active in the times of starting and when the engine is at full load. It can produce two or three injection operations per cycle of individual work. To further optimize the exchange of gases, the system control valve has been given greater freedom of operation.

Audi draft system valve, which adjusts the height of the valves in two stages, is active on the exhaust side. The two camshafts can be adjusted between 30 ° and 60 ° in the angle of the crankshaft. Another element that has been completely redesigned this engine is the turbocharged 1.8 TFSI, developed a high boost pressure of 1.3 bar over a very systematic way.

Moreover, the weight of the engine has also been reduced from 135 to 131.5 kilograms. The new set turbocharger / butt, a new gray cast iron crankcase that reduces the thickness of the wall about three millimeters, a crankshaft with four instead of eight counterweights and the reduction in diameter of the bearings of the bench have helped to achieve This weight reduction.

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