Audi. Saturday , November 04th , 2017 - 12:08:02 PM
The chain drive uses a new concept to reduce the drive power required: the crankshaft drives the balancer shaft via gears, with the shaft lying far down in the V of the cylinder banks. From here chains run to the four camshaft sprockets. These are trioval in shape, i.e. they have a slightly triangular shape, in order to compensate for peak forces. The balancer shaft rotates on roller bearings with particularly low levels of friction.
The increased dimensions of the gran turismo, the 15-millimeter (0.6 in) longer wheelbase and more compact seats increase the space for the driver and passengers. The shoulder room in the front row of seats has been increased by 26 millimeters (1.0 in) and the knee room in the rear by 23 millimeters (0.9 in). The central armrest in the front with storage compartment, the big door pockets, two cup holders and a new, closed stowage compartment beneath the rotary light switch further increase the car‘s everyday usability. One standard feature offering additional convenience to the driver and front passenger is the seat belt height adjustment featuring extending and retracting power belt feeds. The rear bench seat provides space for two passengers and integrates a practical stowage tray between the two seats, as well as a folding armrest. The backrests can be folded forward in the ratio 40:20:40 using the remote unlocking feature in the trunk.
In the induction tract, the intake valves close well before the piston reaches bottom dead center. This very short opening time keeps the fresh gas flow comparatively small. When the piston moves back up again after reaching bottom dead center, the compression phase starts later than usual. This allows a high geometric compression ratio of 10.0:1 - the combustion then takes place in a relatively small volume. In comparison to the short compression phase, the expansion phase is extended, which results in a high level of efficiency.
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