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In a piston engine, either a timing belt (also called a cambelt) or timing chain or set of timing gears is a perishable component used to synchronize the rotation of the crankshaft and the camshaft. This synchronisation ensures that the engine's valves open and close at the correct times in relation to the position of the pistons.
In September 1993, BMW redesigned the M42's timing chain guide rails, replacing the occasionally troublesome lower idler gear with a curved nylon guide rail. The idler gear's retaining bolt could break away from the timing case, often taking a chunk of alloy timing case with it. [citation needed]
Timing chain failure may call for engine replacement or a costly repair. The most seriously affected units which require the most extensive repairs were produced from 01.03.2007 to 05.01.2009. [4] However, there have been reports of timing chain failure in BMW diesel engines manufactured until 2015.
The BMW N20 is a 1.6 and 2.0 L (98 and 122 cu in) turbocharged four-cylinder DOHC petrol engine with variable valve lift and variable valve timing which replaced the N53 (or BMW N52 in some markets) and was produced from 2011 to 2017 by BMW. Although the N20 is a four-cylinder engine, it is considered a replacement for the naturally aspirated ...
The S63 is the BMW M version of the N63, which debuted in the BMW X6 M and was used in the BMW M5 models from 2011 to 2023. The S63 uses two twin-scroll turbochargers plus a pulse tuned, cross-engine exhaust manifold [ 8 ] to keep constant exhaust pulses flowing to the turbos at every 180 degree rotation.
Germany's BMW joined other carmakers in detailing the impact of the unfolding crisis in Ukraine on its operations as it downgraded its profit margin forecast. BMW, Michelin hit by supply-chain ...
A successor to the BMW M60, the M62 features an aluminium engine block [2] and a single row timing chain. [3] In 1998, a Technical Update included VANOS (variable valve timing) for the intake camshafts. The S62 engine is the BMW M high performance version of the M62, which was released in the E39 M5, BMW Z8, Ascari KZ1, and the Ascari A10.
BMW engineers used a DOHC valvetrain on a production engine for the first time on the M88, with the camshafts driven by a single-row timing chain. [4] Kugelfischer fuel injection [5] was used with individual throttle valves [6] and the distinctive six individual throttle bodies. The construction is an aluminium cylinder head and a cast iron block.