Optimization of Multi-Valve Four Cycle Engine Design-The Benefit of Five-Valve Technology

Kazuo Aoi; Kazuhiko Nomura; Hiroshi Matsuzaka

doi:10.4271/860032

1986-02-01

Optimization of Multi-Valve Four Cycle Engine Design-The Benefit of Five-Valve Technology 860032

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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Optimization of Multi-Valve Four Cycle Engine Design-The Benefit of Five-Valve Technology 860032

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