Design and Development of a Variable Valve Timing (VVT) Camshaft 740102
The development of a variable valve timing (VVT) camshaft was initiated as a potential means of controlling exhaust emissions from a spark ignition piston engine. This approach was based on the fact that valve overlap influences internal exhaust gas recirculation which in turn affects spark ignition engine emissions and performance. The design, fabrication, bench tests and engine durability tests of a unit incorporating splines to allow the intake cams to move relative to the exhaust cams is discussed. Preliminary test data from a 350 CID (5700 cm3) engine fitted with the VVT camshaft are discussed with regard to durability and emissions.
Citation: Schiele, C., DeNagel, S., and Bennethum, J., "Design and Development of a Variable Valve Timing (VVT) Camshaft," SAE Technical Paper 740102, 1974, https://doi.org/10.4271/740102. Download Citation
Author(s):
Carl A. Schiele, Stephen F. DeNagel, James E. Bennethum
Affiliated:
Environmental Activities Staff, General Motors Corp., Research Laboratories, General Motors Corp.
Pages: 11
Event:
1974 Automotive Engineering Congress and Exposition
ISSN:
0148-7191
e-ISSN:
2688-3627
Also in:
100 Years of Engine Developments-PT-115
Related Topics:
Spark ignition engines
Variable valve timing
Exhaust gas recirculation (EGR)
Exhaust emissions
Camshafts
Cams
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