BMW - generalna tema

[Geza]

New Efficient Dynamics petrol and diesel engines are said to emit fewer pollutants and run more smoothly; debut likely in 2017 BMW 5 Series
http://www.autocar.co.uk/car-news/new-c ... ngine-line

BMW has revealed its new-generation Efficient Dynamics petrol and diesel engines. The company claims the new engines offer marginally better economy, as well as smoother running, improved acoustic qualities and - especially with the diesels - much more efficient pollution control.

The engines are designed for transverse and longitudinal installations so will be used in future Minis as well BMWs. The company isn’t saying when the new engines will arrive, but it’s likely some will appear first in the all-new BMW 5 Series, which is expected to go on sale later this year.

The German car maker is promising around a 5% cut in CO2 emissions, 7bhp more power and about 15lb ft extra torque. However, it’s thought the redesigned engines have been primarily optimised to reduce exhaust pollutants as much more stringent regulations come in globally over the next decade.

The three-cylinder petrol engines now come in 95bhp/162lb ft and 114bhp/199lb ft guises. The four-cylinder powerplants are available with 147bhp/248lb ft, 188bhp/295lb ft and 231bhp/331lb ft.

Both the three-cylinder and four-cylinder petrol engines get BMW’s ‘Twin Power’ turbo set-up, which consists of direct fuel injection, Valvetronic variable lift for the inlet valves and Double Vanos variable timing for the exhaust and intake valves.

The exhaust manifold and turbocharger are now housed in the cylinder head and a new direct fuel injection system operates a maximum pressure of 350 bar – rather higher than in the current generation of petrol engines. BMW says this allows for more accurate metering of the fuel and, as a result, lower emissions of pollutants.

The new cooling system should also reduce pollutants by optimising the combustion process. This features a coolant pump with two separate outlets – one for the head and one for the block. The two parts of the engine ideally need to be cooled at different rates.

Both engines still have balancer shafts, but the unit for the three-cylinder engine has been redesigned. A single-piece timing chain is used to help reduce noise.

The new diesel engines also promise a 5% drop in CO2 emissions and an emphasis on reducing exhaust pollutants. All of these new four-cylinder diesel engines now get twin-turbochargers - something previously reserved for the most powerful BMW diesel engines.

The low-pressure turbocharger (used at lower engine speeds) has electrically adjustable vanes and the high-pressure turbocharger is integrated into the exhaust manifold. There’s also a switchable cooling system for the low-pressure turbocharger.

New exhaust gas recirculation (EGR) systems have been introduced for both the three-pot and four-cylinder diesel engines. These are intended to further cut exhaust pipe emissions of nitrogen oxide (NOx), a polluting gas that has proven to be difficult to reduce in real-world driving conditions.

As a result, all of the engines get a selective catalytic reduction system and AdBlue urea injection into the exhaust stream to further reduce NOx emissions.

The common-rail fuel injection system of the new diesel family has been redesigned and gets new injectors with a "range of upgraded" sensors to ensure even greater accuracy of the amount of fuel injected into the cylinder.

Fuel pressures have been further increased to 2200 bar for the three-cylinder engines and an extraordinary 2700 bar for the four-cylinder engines.

Perhaps the most unusual aspect of the new diesel engines is that the cylinder bores are not the same diameter along their whole length. Instead, the bores on the new engines are fared sightly at the lower end.

BMW engineers say "thermal and dynamic forces" when the engine is assembled and especially during operation mean that straight-sided bores are not ideal.

Either the piston crown becomes ‘loose’ at the top of the bore or 'tight' at the bottom, increasing friction on every piston stroke. The new bore design should eliminate this problem.

[ljuba]

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[Geza]

Elvisov 507 nakon restauracije.



https://www.youtube.com/watch?feature=p ... IqLuc9pv5I

[Xepoj87]

Prelep auto, pravi roadster

[Scuderia]

[Ivan]

[Scuderia]

[speedy stikis]

Uffffff kako mi je lepo legla ta zelena

[shandu90]

Sent from my LG-H440n using Tapatalk

[Milos]

[Geza]

[Milos]

Al je lepo zafarbao vrata

[speedy stikis]

Nakon Gran Coupe verzija Serije 6 i Serije 4, BMW će u svoju ponudu ubaciti još jedan Gran Coupe, i to najmanji do sada.

Po pisanju nemačkih medija, bavarska fabrika naime priprema i Seriju 2 Gran Coupe, kao rivala Mercedesu CLA i Audiju A3 sedan, a koja bi na tržištu trebalo da se pojavi tokom 2019. godine.

U ponudi motora možemo da očekujemo benzinske i dizel agregate (uključujući i trocilindraše), a možda i hibridnu verziju. U svakom slučaju, šestocilindričnih motora neće biti.

Ovakav bavarski coupe sa četvora vrata bi se cenom smestio između Serije 2 Coupe i Serije 3 sedan, a kako piše BMWblog, automobil će standardno imati prednji pogon (što znači da će biti napravljen na UKL platformi). Imajući u vidu da Mercedes CLA i Audi A3 sedan standardno dolaze sa prednjim pogonom, ovo i ne iznenađuje. Ipak, BMW Serije 2 GC će se opciono verovatno nuditi i sa xDrive pogonom na sva četiri točka.

Jedna od zanimljivih verzija bi mogla da bude M2 Gran Coupe. Ipak, kako stvari sada stoje, male su šanse za ovako nešto.

Takav eventualni BMW M2 Gran Coupe bi raspolagao agresivnijim aero body paketom, M točkovima, sportskim izduvnim sistemom sa četiri izduvne cevi, jačim kočnicama, sportskim sedištima i volanom, kao i snažnim motorom (M2 Coupe inače ima 3,0 litarski šestocilindarski turbo motor sa 272 kW/370KS i 465 Nm / 500 Nm sa overboostom).

[passenger]

Al je lepo zafarbao vrata

programer, taj ga ufotošopirao malo

[Scuderia]

Uffffff kako mi je lepo legla ta zelena

Odlican je, al' te alpina felne su