Do the following problems: a. A two stroke engine runs at 1,000 revolutions per

Question

Do the following problems:

a. A two stroke engine runs at 1,000 revolutions per minute. There is one power stroke per revolution. Piston diameter is 3", stroke length is 5", and the average pressure on the piston is 200 pounds per square inch.. What is the power in ft-lb/sec and in Horsepower?

b. A two stroke engine runs at 3,000 revolutions per minute. There is one power stroke per revolution. Piston diameter is 1 cm, stroke length is 2 cm, and the average pressure on the piston is 2 MPa. What is the power in Watts?

Explanation / Answer

A) power = 200 * (pi/4 * 3^2) * (5*0.0833) * (1000/60) = 9817.08 ft.lb/s = 17.85 hp

B) power = 2*(10^6) * (pi/4 * 0.01^2) * (0.02) * (3000/60) = 157.08 watts

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