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The crankshaft drives the camshaft (via a timing belt, timing chain or gears), which in turn actuates the intake and exhaust valves. [1] These valves allow the engine to inhale air (or an air/fuel mixture) and exhale the exhaust gasses. [2] The most common devices to transfer the drive are toothed rubber belts, metal timing chains or a set of ...
the 162 kW (only Polo R WRC) and higher versions have stronger pistons and gudgeon pins, new rings, reinforced connecting rods, new bearings, reinforced cylinder block at the main bearing pedestals and cap, new lightweight aluminium-silicon alloy cylinder head for high temperature resistance and strength, adjusted exhaust camshaft timing ...
The Polo Mk5 was relaunched in South Africa in February 2018 as the Polo Vivo. It replaced the Polo Mk4-based Polo Vivo and sold alongside the Polo Mk6 as a budget-friendly option. [31] [32] The Polo Vivo is offered in four trim levels including Trendline, Comfortline, Highline, and GT. Two 4-cylinder petrol engines are offered, a 1.4-litre and ...
The Mark III Polo or Typ 6N, (sometimes referred to as the "Mark 4" by enthusiasts as it is the Polo's fourth guise) appeared in 1994, [1] [10] and was a completely new model (on a new chassis), available as three- and five-door hatchback versions, the latter making VW the last major European manufacturer to finally offer rear side doors in ...
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On 11 March 2010, Volkswagen South Africa announced that the Volkswagen Citi Golf is being replaced by a version of the Mk 4 Polo, the Polo Vivo. It is available with a choice of two 1.4-litre engines (55 kW & 63 kW) [13] and a 1.6-litre engine (77 kW). [14] The Polo Vivo is sold in both 3-door and 5-door versions and as a saloon.
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.
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