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Written by Jeff Seabrook
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Friday, 17 September 2004 |
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Page 2 of 4
A masterpiece in engine construction.
The two five-cylinder banks of the V10 are arranged at an angle of 90° to achieve a mass balance of the crankshaft drive, which is optimised for low vibration and increased comfort. For reasons of stiffness and due to the high loads resulting from combustion pressure, engine speed and vibrations, a bedplate design has been chosen for the crankcase, the first-ever
application in a production V engine by BMW. For an optimum alignment of the crankshaft, grey-cast iron inserts have been integrated into the aluminium bedplate, which also serve to enhance acoustics, increase vibrational comfort and ensure a high oil supply rate. The extremely stiff crankshaft is supported by six bearings.
High-pressure bi-VANOS and individual throttle butterflies.
The bi-VANOS variable valve timing featured in the new M5 engine ensures
an optimum charge cycle, thus helping to achieve extremely short adjustment times. This means in practice: increased performance, an improved torque curve, optimum responsiveness, lower consumption and fewer emissions. Each cylinder has its own throttle, a feature typical of racing cars. Throttle control is fully electronic and cylinder bank specific.
Dual exhaust system made of stainless steel.
The exhaust system is made of seamless stainless steel and has a dual-flow design all the way to the silencers. The exhaust gases finally leave the system through four tailpipes which are what make the rear end of the M vehicles so unmistakable. The exhaust system complies with the European EU4 and the US LEV2 emission standards.
The engine control module: the first of its kind in the world.
The MS S65 engine management system is the central factor behind the V10's outstanding performance and emission data. This engine management system is unparalleled in its package density. Its processors are the most powerful ones which are currently approved for use in automobiles, as high engine speeds and comprehensive management and control tasks demand the utmost from this system.
Highlight in engine management: ionic current technology.
The ionic current technology featured by the engine management unit is
a technological highlight which serves to detect engine knock, misfiring and combustion misses. Utilising the spark plug in each cylinder, this system
helps to pinpoint engine knock, to check for correct ignition and to detect any ignition misses. Thus, the spark plug has a dual function - as an actuator
for the ignition and as a sensor for monitoring the combustion process.
Seven-speed SMG gearbox conveys M power to the tarmac.
The high-revving concept only succeeds in combination with a gearbox
which translates the torque available to the engine, by means of a short overall transmission ratio, into optimised forward thrust.
The seven-speed SMG gearbox is precisely the right transmission to ideally convey the V10 engine's power via the drive train to the wheels. BMW M is the first manufacturer worldwide to offer a seven-speed sequential gearbox with drivelogic function. Even more highly perfected than the previous six-speed transmission, the seven-speed SMG gearbox enables manual gear selection with ultra-short shifting times as well as comfortable cruising thanks to automated gear selection. The purpose of the additional seventh gear is to reduce engine speed and torque gaps
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BMW AG News 
Sunday, 11 May 2008
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