![]() ![]() In both cases (R-R Crecy and Bristol sleeve) the sleeve valve is supported asymmetrically causing flexing and increasing the friction. In both cases it is required a strange connection between the sleeve valve and its actuator. While the angular oscillation of the Bristol sleeve valves about their cylinder axes offers a significant functional advantage (maximization of the valve-time-area), this is not the case for the Crecy 2-strokes sleeve valves wherein the angular oscillation just increases the inertia loads and the friction. ![]() The sleeve valves of R-R Crecy move at double frequency than the sleeve valves of the Bristol Radials 4-strokes: Arrangement of Rolls-Royce Crecy 2-stroke as a solution for modern 2-strokes. ![]()
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