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mpression Ratio Variation by Manual Control

15th December 1961
Page 69
Page 69, 15th December 1961 — mpression Ratio Variation by Manual Control
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OUGH the potential advantages employing variable-compression n diesel engines have been overd in. the past two or three years notable progress that has been th high combustion pressures in engines, a means of varying the don ratio to match load-speed ristics will undoubtedly be reconiy engine designers in the not-too'inure. It is therefore of more tdemie interest that a variable;ion piston with manual control evolved by the British Research ion for use in research engines the. piston has been developed worth and Grandage, Ltd., of

• . who are producing the unit :ence. In addition to offering for investigating the potential blc compression for diesel and ngines, the piston will be into designers in determining the compression ratio for a new on the well-known BICERA ;ally operated variable-compreson, the manually operated type a control gear, mounted on the

side of the crankcase, which, in the experimental application provides for variation of ratio between 15.5 to I and 20.5 to 1 while the engine is running. Essential components of the piston comprise a gudgeon-pin carrier and an outer shell, relative movement of which causes hydraulic fluid to be transposed from one chamber to a second chamber in the assembly, oil being fed to the system from a drilling in the connecting rod.

Inertia tends to move the piston shell outwards over a number of cycles when the engine is Operating under light loads and thus to increase the, compression ratio, the flow of fluid being metered by an 'orifice. Downward movement of the' shell by combustion pressure is controlled by an outlet valve, actuated by a rod which contacts a lever in the control gear. Adjustment of the lever mechanism gives control of compression ratio.

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Organisations: US Federal Reserve

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