If there is only one camshaft in each cylinder head, it is called the single overhead camshaft (SOHC) as shown in Fig.2-8a．
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- If there are two camshafts in each cylinder head, we call the double overhead camshaft (DOHC), one responsible for intake, the other for exhaust as shown in Fig.2-8b．
- In most modern cars, the camshaft is fixed in the cylinder head rather than in the cylinder block in the traditional engine．
- The _________ is called the "backbone" of the engine. A: camshaft B: crankshaft C: bearing D: cylinder
- Where is the camshaft located? A: In the cylinder head. B: In the cylinder block. C: Either in the cylinder head or in the cylider block. D: In the oil pan.
- In a two-stroke engine that uses a camshaft, each valve is opened _____ for every rotation of the crankshaft; in these engines, the camshaft rotates at the same speed as the crankshaft.In a four-stroke engine, the valves are opened only half as often; thus, _____ of the crankshaft occur for each rotation of the camshaft. A: once ... two full rotations B: twice ...two full rotations C: once ... one full rotation D: twice ... one full rotation
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（） is usually driven by the engine camshaft and supplies pilot air to the cylinder air start valve.
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（） for the camshaft gear train is taken from a spur gear which for a six cylinder engine is at the coupling end.
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In some engines,the cylinder block also carries the ______ . A: camshaft B: crankshaft C: shaft D: countershaft
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The cylinder head starting valve of ME type diesel engine is controlled by . A: Mechanical air distributor B: solenoid valve controlled by electronic control system C: The main starting valve D: The camshaft
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camshaft