an N. A. C. A. universal gressively altering the passage shape. X. A. C. A. cylinder-head design 7 was made (see fig. engine crankcase (reference 2) and cylinder were sub- stituted for the Liberty crankcase and cylinder. Si and- 3) to pei init a wide range of changes in the connecting passage and… … Figure 1.—Single-cylinder engine and test equipment. of different chamber parts and adjustments of the uni- 80°, 140°, and 170° F., respectively, during all tests. versal test engine, this cylinder head was readily adapted A 50-75 horsepower electric cradle-type dynamometer to the investigation of…
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