Archive for category Audi
Audi A4 B8 Camshaft
Posted by in Audi on June 30, 2011
The new engine under the hood of Audi A4 is 2.0 TFSI. It is a turbocharged 4 cylinder engine, derived from its successor, the 2 liter engine. Since its debut in the year 2005, it has been continuously voted three times as “Engine of the Year” by an international jury consisting of journalists.
The new 2.0 TFSI most important segment is the inlet camshaft. This inlet camshaft adjusts variably up to 60 degrees of crankshaft rotation and the two balancer shafts rotating with double the speed of crankshaft in the crankcase. This operation compensates the free-second order inertial forces and reduces the vibrations leading to a refined running.
The injection of the 2.0 TFSI demonstrates the innovative technology by Audi. The fuel is delivered into the combustion chamber through the newly developed injectors which have 6 holes in them. The result is a complete combustion, enhanced by the valves for Vortexing the injection. The cylinders are filled with air with the help of the water-cooled turbocharger. Optimized turbine and compressor wheels have increased the reaction time. There has been a change in the intercooler as well. It has a combination of high efficiency with low weight and smaller dimensions.
Audi also developed a new Valve lift system for the 2.0 TFSI engine. Unlike the 3.2 FSI, the new system facilitates variable control of the exhaust valve. With this change in the exhaust valve, Audi A4 reaches its maximum torque of 258 lb-ft at an engine speed of just 1,500 rpm which states the drastically improved system. The engine’s camshafts are provided with splines that carry the cylindrical sleeves. The cam elements are designed for two profiles – one for low valve lifting and the other for a full valve lifting. Metal pins are engaged in the spiral grooves on the sides of the revolving cam elements with the help of the electronic shift system.
The V6 engine’s inlet camshafts are provided with splines that carry cylindrical sleeves. These cam elements have two different profiles, one for low valve lift, and the other for full valve lift. Metal pins actuated by an extremely rapid electronic shift system engage in spiral grooves on the sides of the revolving cam elements and displace them by seven millimeters along the camshafts.
The lower cam profiles actuate the valves roller cam followers during the part-load. With this operation, the valves open up by either 2.0 or 5.7 millimeters. The difference in the valve shift introduces a controlled turbulence in the mixture as it forms in the combustion chamber. This ensures a clean combustion of the mixture. At full-load, the larger cam profiles come into action, lifting the valves up to 11 millimeters. The changeover takes place anywhere between 700 rpm and 4000 rpm of the engine speed. The whole operation is completed within two turns of the crankshaft.
The new valve lift technology ensures a quicker and dynamic build up torque, resulting in excellent spontaneity and agility. The new Audi technology plays an important role in achieving high efficiency as does the consistent improvement of all components to minimize friction. The important area that saw new lights is the area of cylinders and the connecting rod bearing linings. The fuel consumption is reduces with the oil-pump operating at volume-regulated delivery and two stage pressure control.
The new 2.0 TFSI engine delivers a sporty 211 HP and a mighty amount of 258 lb-ft torque, available from 1500 to 4200 rpm. This is available in the North American markets with Quattro drive with both Manual and Tiptronic transmissions for the Sedan segment. Audi also delivers the new A4 with front wheel drive with the continuously variable Multitronic. Read the rest of this entry »
2012 Audi A8 Review
Posted by in Audi on June 30, 2011
The Audi A8 series has not disappointed when it comes to offering stylish cars into the market. In fact, the brand is best known for offering luxurious and stylish vehicles into the market while also adding comfort and performance into the mix. This is a significant reason behind the success of the brand and the performance of previous model releases will become a reference as to how the new 2012 Audi A8 will be like. Shall we get started into looking at the details of this new car model?
The best way to describe the new Audi A8 2012, according to critics, is that it is a perfect blend of luxury and efficiency. The body specifications of the A8 2012 are largely similar to that of the 2011 model, although new features were integrated into the brand new model to add more efficiency to your ride. The actual measurement of the body’s length is at 17.29 inches, while it features new LED headlights that deliver a new sense of style with its striking expression that complements the vehicle’s body style. Meanwhile, it is also an added safety function, along with several other features that were incorporated into this new 2012 A8, such as the in-trunk emergency release and the tire pressure monitoring capability.
The 2012 Audi A8 also comes equipped with many features that improve driving efficiency such as front and rear heated seats, navigation system, and parking sensors. The 2011 model got negative feedback from consumers with its use of a 17-inch tire wheels, hence the manufacturer made all the necessary adjustment with this new release and the 2012 model now comes with an 18-inch wheel.
The performance of the 2012 Audi A8 is one of the brightest features of this model. The use of a turbocharged 4.0 liter V8 engine can deliver up to a maximum of 310 horsepower to ensure optimum power and efficiency on the road. This type of engine is indeed capable of delivering excellent driving ability. Meanwhile, the hybrid models that are also due for release feature the Audi Valve lift system and a 4-cylinder unit that takes your driving performance up another notch.
Another excellent thing about the 2012 Audi A8 is the acceleration capacity, which is unlike any other in the market. Within only 7 seconds or less, it can go from a complete standstill to as much as 100 km/h in speed. In fact, its top speed capacity can reach up to 210 km/h. The excellent driving performance and speed is impressive for a model that is known to be fuel-efficient. The engine for this model is determined to consume 13.5 liters of fuel within a 100-km distance run. It is therefore one of the most fuel-efficient models around, especially when compared against other similar vehicles in the market today. Read the rest of this entry »