The New Camshaft Adjustment System By Mercedes-Benz--Design And Application In 4-Valve Engines

The New Camshaft Adjustment System By Mercedes-Benz--Design And Application In 4-Valve Engines

The valve timing of internal-combustion engines usually represents a compromise with regard to the requirements placed on power output and torque. Extensive operation process simulation and measurements on real engines have shown that it is quite possible to achieve considerable improvements with constant valve lift and differing intake timing. Varying valve lift with engine speed is not necessary, since in this way only minor torque improvements can be gained. The requirements are met sufficiently with two timing settings. Extensive system analyses and concept studies led to the mechanically/hydraulically actuated camshaft adjuster which is described below in detail, and which is used in the new four-valve Mercedes-Benz engines. The camshaft adjuster is controlled in accordance with the requirements of engine and vehicle by the gasoline injection control unit, depending on engine speed and load. A full-load comparison with the predecessor model shows an average torque increase of 8 % in the most frequently used range between 2000 and 6000 rpm. AS IS GENERALLY KNOWN, conventional engine designs with 4 valves per cylinder possess a high power-to-weight ratio. With the previous configuration, however, the idling quality and particularly the torque curve in the lower engine-speed range are unsatisfactory. A specific improvement in these variables can theoretically be achieved by adjusting the lift and timing of the valves. However, variable valve lift can only be attained at present at unacceptably high cost. For this reason, this is currently implemented only in test-bench units for basic tests.

Mercedes Benz is one of the top luxury cars in the world, trusted and preferred by thousands of discerning drivers. The three-point star has been the symbol of the best in automotive industry since 1881, which is a long time to build a legacy and collect some interesting tales. So while you may know the features of an S class or CLS like the back of your hand, here are 5 facts that you probably didn't know about Mercedes-Benz. It is the oldest automaker in the world: Yep, the first ever automobile in the world was created by Karl Benz in 1886! Until this internal combustion powered vehicle was created, your only mode of transportation on roads was a horse buggy. And while you may be guilty of judging female drivers, you'd be interested to know that the first long distance driver was a woman, Karl Benz's wife Bertha Benz who drove for almost 120 miles and was also the co-inventor.

Mercedes was also a lady's name: The greatest name in innovative automotive engineering is greatly indebted to women. Emil Jellinek was a successful businessman and enthusiastic race car driver who built race cars under the pseudonym of 'Mercedes' which was his daughter's name. The name had earned such good reputation that in 1902 he registered it as trademark and thus was born Mercedes-Benz. You can always check out this history at the Mercedes showroom in Delhi, especially at the Mercedes showroom in Delhi NCR. A starry tale: The legendary three-point star logo was almost a 4-point star to showcase its prowess on land, water, air and space. Silver Arrow: Silver is the trademark colour of Mercedes-Benz cars but the origination of it was quite strange. German race cars were always white, however in 1934 when the W25 was meant to race, it was 1kg beyond the stipulated weight. To lose the 1 kg the entire car's paint was scraped off. The good news, it not only won but set a new track record! Since then all German cars kept the silver bare aluminium body which led it to be known as Silver Arrow. History has made a full circle as a new Mercedes showroom in Delhi NCR is also called Silver Arrow. Formula 1: Mercedes F1 has always been in the forefront when it comes to making fast cars making its drivers Lewis Hamilton and Nico Rosberg popular names. It is the ingenuity of Mercedes engineers which has led to their countless wins. True to tradition, till date all F1 cars are painted metallic silver.

It has always surprised me that there aren鈥檛 more all-wheel-drive convertibles on offer. Far as we鈥檙e concerned, there is no better time to enjoy a top-down drive than during a beautiful sunset, which can be comfortable even in chillier temps thanks to the C300 Cabrio鈥檚 AIRSCARF and AIRCAP features. So right off the bat, the C300 4Matic Cabrio was scoring points, combining as it does terrific wind-in-your-hair appeal with capable all-wheel-drive abilities. As it鈥檚 very similar in most other regards to the C300 Coupe reported on previously, I鈥檒l focus on its open-air aspects here. While power-folding hardtops were all the rage awhile back, most manufacturers have returned to traditional soft tops in recent years. And in cars like the C300, those soft tops are so nicely insulated that top-up travel is almost as serene as in a comparable coupe. 1090 Parking Assist Package. Clockwise from top: The AIRCAP option includes a tilt-up windshield 鈥渟poiler鈥?and rear mesh screen that limit wind buffeting at speed.

The progress of opening or closing the top can be viewed via an animated graphic in the center instrument cluster. The standard AIRSCARF feature blows warm air on the back of your neck, a real benefit in cooler temperatures. During my evening top-down drive, the ambient temperature dipped into the low 60s. While that can be uncomfortably cold in a convertible, two features of the C300 helped make it perfectly palatable. The first was the standard AIRSCARF, essentially an electric heater/fan contained in the front-seat headrests that blows warm air on the back of your neck. The second was Mercedes鈥?AIRCAP, a combination of a tiltable 鈥渟poiler鈥?atop the windshield header and a mesh windscreen that raises up behind the rear seat, both serving to cut the draft that normally buffets the interior at speed. 6900 Premium 3 Package, which also includes a navigation system, high-end audio system, adaptive headlights with automatic high beams, blind-spot and rear-cross-traffic alert, lane-keep assist, adaptive cruise control, and a few other items. One oddity noticed while top-down driving was that the unused shoulder belts flapped in the breeze, with the front one banging against the inner body panel. The latter problem was fixed by buckling the belt, but there was still some 鈥渇lutter鈥?coming from the rear belts, which could probably be quelled by doing the same. Our test car was fitted with Bengal Red upholstery, which really sets off the stately, nicely appointed interior. As the soft top folds into the trunk, cargo volume is affected, even when the top is up. According to Mercedes, the Coupe trunk has a capacity of 10.5 cu. Cabrio, 8.8 cu. ft. 鈥?and that鈥檚 with the top up. Top up or down, the C300 Cabrio strikes a dashing profile that 鈥?thanks to its 4Matic all-wheel drive 鈥?can be shown off all year round.