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Optimization of Multi-Valve Four Cycle Engine Design-The Benefit of Five-Valve Technology
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Abstract
THE MULTI-VALVE FOUR STROKE CYCLE engine design trend is Coward increased engine power and higher fuel efficiency. While a four-valve system is the most common direction, problems occur when the valve area is widened by increasing the cylinder bore for a higher engine output. The layout of four larger valves causes the combustion chamber shape to flatten and the combustion time period to increase.
In pursuit of the optimum multi-valve engine we have studied four, five, six and seven-valve per cylinder design. Performance targets and design constraints led us toward the successful five-valve engine technology. This technology develops high engine torque and efficient combustion over a wide range of engine speeds.
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Aoi, K., Nomura, K., and Matsuzaka, H., "Optimization of Multi-Valve Four Cycle Engine Design-The Benefit of Five-Valve Technology," SAE Technical Paper 860032, 1986, https://doi.org/10.4271/860032.Also In
References
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