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General Motors High Performance 4.3L V6 Engine
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Abstract
The 200 HP high performance 4.3L Vortec V6 engine has been developed to satisfy the need for a fuel efficient performance powerplant in the General Motors small truck platforms. Marketing requirements included strong low and mid range torque, relatively high specific power, smoothness and noise comparable to the best competitive six cylinder engines, excellent driveability, and a new technology image. Maintaining the 4.3L engine record of high reliability and customer satisfaction was an absolute requirement. Fuel economy and exhaust emission performance had to meet expected customer and legislated requirements in the mid 1990's.
New engine features include:
- Dual tuned intake manifold with integral throttle body
- AC Rochester central port fuel injection
- High flow swirl port cylinder heads
- High lift roller camshaft
- Primary balance shaft
- AC Rochester linear EGR
- High alloy aluminum pistons
An engineering product development team used the GM engine simulation program and “breadboard” development induction systems on test engines to evaluate alternative induction system proposals. A long runner design with controlled variable tuning was found to be the optimum configuration to meet engine performance requirements. AC Rochester was the tier one supplier and design responsible for the final intake manifold concept, fuel system, and EGR valve. This engine is the rollout application for central port fuel injection (CPI), linear EGR, and the electric motor driven intake manifold tuning control valve.
Design, development, and validation of the as-installed engine package was done in cooperation with GM Truck and Bus and AC Rochester. The project was conducted within the guidelines of the GM 4-Phase Process. Initial applications are in the General Motors compact pickups, sport utility trucks, and mid-size vans.
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Graham, C., Graves, M., Pedigo, R., and Tenkel, F., "General Motors High Performance 4.3L V6 Engine," SAE Technical Paper 920676, 1992, https://doi.org/10.4271/920676.Data Sets - Support Documents
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| Unnamed Dataset 1 |
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References
- Walker, J. W. Wiltse, R. F. Harhaus, V. W. The GM 4.3 liter V-6 Gasoline Engine SAE Paper 841225 the Passenger Car Meeting October 1994
- Harhaus; V. W. Pocobello, M. Tenkel, F. G. The Turbo / Intercooled Syclone Engine SAE Paper 910682 the SAE International Congress and Exposition February 1991
- Subhedar, J. W. Leskiw, P. M. Hahn, C. J Langdon, T. P. General Motors 3.4L “Twin Dual Carn V6” Engine SAE Paper 910679 the SAE International Congress and Exposition February 1991
- Kazarinoff, Dimitri N. Residual Combustion - Gas Backflow in a Port Fuel Injected Spark Ignition Engine Massachusetts Institute of Technology June 1985
- Pozniak, D. J. Rydzewski, J. S. A study of In-Cylinder Air Motion in the General Motors VORTEC 4.3L, V-6 engine SAE Paper 850510 the SAE International Congress and Exposition February 25 1985
- Zizelman, J. Seino, M. J. Graves, M. C. Manz, J. C. Central Port Injection SAE Paper the SAE International Congress and Exposition February 1992