BMW M440i xDrive Coupé & Cabrio
The straight six-cylinder power units used in the new BMW M4 Coupé and the new BMW M4 Convertible combine the typical high-revving characteristics offered by engines from BMW M GmbH with the current version of M TwinPower Turbo Technology. All variants of the 3-litre engine impress with responsive power delivery and high-torque characteristics up into the highest load ranges. These attributes are responsible for those unmistakable, linear performance characteristics, which have always been the hallmark of BMW M automobiles.

The engine‘s design features directly derive from motor racing and include the extremely stiff crankcase, which is manufactured in a sleeveless closed-deck design, the weight-reduced forged crankshaft and the iron coating, which is applied to the cylinder liners in an arc wire spraying process (AWSP). Manufactured in a 3-D printing process, the cylinder head core features an optimised routing of the coolant ducts, something that cannot be realised using conventional metal casting technology. In this way, both weight and temperature management are optimised. Like the cooling system, the oil supply is also aligned to the special demands of racetrack use.

M TwinPower Turbo Technology comprises two mono scroll turbochargers, each of them supplying three cylinders with compressed air. Indirect intercooling facilitated by a low-temperature circuit and specific compressors optimise the power output of the charging unit. Moreover, the technology package includes the petrol injection system High Precision Injection operating at a maximum pressure of 350 bar, variable valve control VALVETRONIC and infinitely variable camshaft control Double VANOS.

Maximum power output of the straight six-cylinder power unit variant featured in both the new BMW M4 Competition Coupé with M xDrive and the new BMW M4 Competition Convertible with M xDrive has been increased from the previous 375 kW/510 hp to 390 kW/530 hp, this being reached at an engine speed of 6,250 rpm. The further developed engine retrieves maximum torque of 650 Nm within an extended engine speed range of between 2,750 and 5,730 rpm. This results in even more superior and continuous power delivery, thus further enhancing the performance experience above all in highly dynamic driving situations. This exclusive performance specification is realised through a modification of the engine control system, providing further proof of the outstanding potential of the straight six-cylinder engine developed by BMW M GmbH and which serves as the basis for the power plant featured in the BMW M4 GT3 long-distance vehicle.

Whilst the new BMW M4 Competition Coupé with M xDrive is able to accelerate from 0 to 62 mph in 3.5 seconds, the new BMW M4 Competition Convertible with M xDrive takes 3.7 seconds to reach the same speed from a standstill. All model variants of the new BMW M4 Coupé and the BMW M4 Convertible achieve a top speed that is electronically limited to 155 mph. This value can be increased to 174 mph with the optional M Driver’s Package (BMW M4 Competition Convertible with M xDrive) or 180 mph respectively.


Source: bmw

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