Assertion: engine's camshaft | /r/CapableOf | travel exhaust valves
Facets:
value: to allow for compression
type: PURPOSE
Source sentences:
text: For every two crankshaft revolutions in any engine, the pistons move up and down twice, while the camshafts travel one revolution, opening and closing intake and exhaust valves to allow for intake, compression, power and exhaust strokes.