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The VR6 engine was a six-cylinder engine configuration developed by Volkswagen.The name VR6 comes from the combination of German words “V-Motor” and “Reihenmotor” meaning “inline engine” referring to the VR-engine having characteristics of both a V-layout and a inline layout.
2.9 litre 15° VR6; bore × stroke (mm): 82.0 × 90.3 cylinder block & crankcase grey cast iron; seven main bearings, die-forged steel crankshaft cylinder head & valvetrain cast aluminium alloy; two valves per cylinder, 12 valves total, duplex chain-driven double overhead camshafts (DOHC) fuel system & engine management
cast aluminium alloy; four unequal-length valves per cylinder, 24 valves total, low-friction roller finger cam followers with automatic hydraulic valve clearance compensation, simplex roller chain-driven double overhead camshaft (DOHC – one camshaft for all exhaust valves, and one for all intake valves), continuous timing adjustment variable ...
The narrow angle of each set of cylinders allows just two overhead camshafts to drive each pair of banks, so the WR12 engine has both a crankshaft design, and the same number of camshafts as the V-12 engine. Where the VR6 is a staggered-bank straight 6, the WR12 in turn is a staggered-bank V-12 in terms of engineering design.
The Alfa Romeo Twin Spark engine, introduced in the 1987 Alfa Romeo 75, also uses variable valve timing. [3] [4] The Alfa system varies the phase (not the duration) of the cam timing and operates on the inlet camshaft. [5] Alfa Romeo's variator is a cylindrical chamber that contains a pressure chamber and piston along with helical splines.
Inside the Numbers dives into NFL statistics, streaks and trends each week. There's already a record number of teams that have clinched a playoff spot with three weeks to play in the NFL season ...
The College Football Playoff cake is getting close to baked, which means much of the angst and anger of the past few weeks over hypothetical and projected scenarios have proved a waste of time.
The only mass-production W12 engine is the Volkswagen 6.0 WR12 48v, a four-bank design which was released in 2001.This engine has been used in several models from the brands Audi, Bentley, and Volkswagen, and in 2003 a turbocharged version was released.
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