BMW cylinder turbo N20 B20 1It is now 38 years ago, the Bayerische Motoren Werke AG, the world’s engine compartment to the head turned. Instead of big, fat line six-cylinder engines, BMW offered in 1973 as the crowning of the 2002 tii pioneered first turbocharged four-cylinder engine for road traffic. But the timing was more than inconvenient, and so the oil crisis caused by only 1672 units built for the rapid decline of the BMW 2002 Turbo. The car provoked and made it even before its mass production, spark debate about the “excesses on the road.” The 2002-turbo-in mirror script lettering on the front spoiler so do not even reach the customer and has not removed before the public presentation at the IAA 1973rd



The M31-called turbo engine delivers 170 hp at 5,800 rpm and then it is 40 hp more than the 2002 tii sports base. Accelerated so that the light carriage for his sensational time: With values ​​of 6.9 s had to sprint from standstill to 100 km / h and a top speed of 211 km / h even a much more expensive Porsche 911 at a disadvantage compared to the chubby 02 . The first Porsche Turbo came only way to model year 1975 and thus after the turbo BMW on the market.BMW 2002 turbo 1Moves quickly to the 2002 turbo was no vehicle for beginners. Up to 4,000 rpm when driving was more fashionable than ebb tide and then suddenly rush to the front, as if the devil himself knocking the car onto the rear spoiler. The KKK turbocharger was exclusively for the performance and not, as now also the increase in comfort. The specific power output of 85 hp and the torque of 122.5 Nm liter of 1990 cc inline four-cylinder big time were quite unique. But even though the M31 is loaded with cash, but only a maximum of 0.55, let the simple technique of inserting the harmonic no charge. The higher the touring engine and expels its exhaust, the faster the turbine rotates. With more than 100,000 revolutions rotates the Pulley.

Also here was particularly the phrase “run Turbo, Turbo drinking.” BMW showed at the constant speed of 110 km / h, a consumption of 10.5 l/100 km out. Too much for a time in the winter of 1973 to conserve fuel was briefly introduced the ban on Sunday. Disappeared after discontinuation of production of the BMW 2002 turbo in it for three and a half decades, fueled by a turbocharger, four-cylinder gasoline engine. The focus of the dedicated engine development was directed by the end of the 02-era especially on big, fat, silky high-revving six-cylinder engines.

Ironically, by the turbocharged four-cylinder Volkswagen was then end of the 90s in a big way once his rehabilitation. Long did it take BMW to respond accordingly and to report back in this segment. The performance of the new turbo engine called N20B20 read promising: 1,997 cc, 245 hp and 350 Nm. Also interesting are the low rated speed: 5000 rpm, 245 hp generated case, just as fabulous 1.250/min at 350 Nm. The values ​​promise particularly relaxed driving. Lack of revving you need, as much is already betrayed no fear. The engine revs up even slightly at 7,000 rpm and is not afraid of high speeds.

The engine was designed complex. The six-cylinder engine from the current N55 twin-scroll turbocharger technology adapted to Valvetronic fully variable valve timing and direct injection make the N20-the-art four-cylinder engine on the market. Arranged between the valves, solenoid-valve injectors operate with a maximum injection pressure of 200 bars. With up to 1.2 bar of the loader, the turbine air intake scoops in the combustion chambers. The Valvetronic technology with continuous control of the lift of intake valves is the usual throttle valve and thus cease throttling losses. The outstanding response of a normally aspirated engine, optimization in which an air collector, a single throttle valve and a manifold system, the charge exchange is not achieved in spite of the measures. In direct comparison to such a naturally aspirated engine has throttle response is delayed so easily. A turbo engine traditionally scores with other things: high power output, high torque, human speeds.

With a specific power output of 122.5 hp and 175 Nm of torque liters of N20 suggests its ancestor M31 had expected just above idle speed. His debut is the new turbocharged engine in the March 2011 revised BMW X1 xDrive28i. Why in 2.0 liters of displacement as 28i, wondering perhaps some interested people. For one of the engine Valvetronic inline six-cylinder with 258 hp N52B30 replaced, on the other hand is in the nomenclature again reminded of the turbo factor. He comes from bygone days and motorsport was 1.4. Thus, a supercharged engine achieves about 1.4 times as much power as a comparable, naturally aspirated engine. BMW turned the name trick in the 80 years before the six-cylinder turbocharged 732i at that so called 745i. Despite less power, the new xDrive28i accelerates much faster than with the N52B30. The main reason is the consistently higher level of performance in the midrange. At 3,000 rpm makes the N20 about 150 hp at 4,000 rpm, just under 200 hp. The now only in the BMW 130i and Z4 sDrive30i used here for comparison engine delivers only 130 hp 170 respectively.BMW cylinder turbo N20 B20 2

When good old 2002 turbo, these values ​​of course, read more cautious: 85 hp at 3,000 rpm and well over 135 hp at 4,000 rpm something. With the new 2.0-liter engine, BMW announces impressive comeback in the four-cylinder scene. The many technical details and innovations such as the map-controlled oil pump and working as required, electric coolant pump can achieve high efficiency. Compared to the N52-X1 offshoot N20 engine consumes about 16% less fuel.
BMW cylinder turbo N20 B20 3The motor will stop in many feeder series. Another feature of version of BMW M GmbH, will also be in development for current information. In addition to the big 1997 cc turbo engines in the near future for the lower performance classes, a supercharged, 1.6 liter only large engine, introduced N13B16. Long live the turbo!

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