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Development of Titanium Hollow Valve and Study of Sodium-potassium Valve

Article of Honda R&D Technical Review F1 Special (The third Era Activities)

Summary

Valve specifications with the largest hollow area possible while still assuring the strength of welded areas were established, achieving a weight reduction of 4.4 g per valve, and applied to races. In addition, a high-quality oxidation resistant process was established for filling titanium valves with sodium-potassium, and technology that cools the high temperature areas of the valve by 100°C or more was developed. These cooling effects enabled expansion of the hollow area, further reducing the weight by 4.8 g per intake valve and 4.6 g per exhaust valve. Engine 2-race event durability tests were completed, but the intake valve experienced a drop in output due to the effects of sodium-potassium heat exchange, and some issues with exhaust valve durability also remained.

Reference

(1) Japan Society of Corrosion Engineering: Fusyoku bousyoku handobukku, Maruzen, p. 32 (2000) (in Japanese)

Author (organization or company)

Taihei SANADA(Automobile R&D Center)

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