Description of the NACA Universal Test Engine and Some Test Results (1927)
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DVISORY COMMITTEE FOR AERONAUTICS The timing of the opening and closing of the valves is varied by the use of three part cams. The central part of each cam is fixed directly to the cam shaft by means of splines while the two outside parts can be rotated independently with respect to the central… … Fig. 6.—Camshaft assembly—cam parts displaced slightly from aligned position made in opposite directions so that rotation of one of the outside parts varies the opening point while rotation of the other in the opposite direction varies the closing point. When both outside parts are displaced from…
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