Catalogue


The “Two-in-One” Engine - Porsche's Variable Valve System (VVS)
Brüstle, C., author.
description
1 online resource.
format(s)
Journal
Holdings
More Details
issn
0148-7191
standard identifier
10.4271/980766
restrictions
Licensed for access by U. of T. users.
abstract
Driving fun - one of the major thrills expected by the buyers of high-performance cars - must be absolutely preserved despite all the measures required to further reduce the car's exhaust emissions and fuel consumption. Powerful engines with high BMEP levels require large unrestricted inlet and outlet valve diameters and lifts as well as a wide camshaft phasing range at least on the intake side. In terms of exhaust emissions and fuel economy such an engine layout is rather unfavourable. Its inherent drawbacks, however, can be compensated by providing for what might be called a “two-in-one” configuration which combines a low-emission concept including intake-valve lift shifting and exhaust-camshaft phasing with a high-performance-engine concept complete with a wide intake camshaft phasing range and large intake valve lifts and a Varioram intake system. With this basic layout, even high-performance sports cars are able of falling below the current ULEV limits.
catalogue key
11107450

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