An 8-cylinder engine has 1,500 power strokes per minute, a bore of 3.555 inches, a stroke of 3 5/16 inches, and average pressure of 100 pounds per square inch. Find, to the nearest tenth, the horsepower of the engine.

Question

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To find the horsepower, use the formula: HP = (PLAN) / 33,000, where P is the pressure (100 psi), L is the stroke in feet (3 5/16 inches = 0.276 feet), A is the area of the bore (π * (3.555/2)^2), and N is the number of power strokes per minute (1,500 for all cylinders). Calculate A, then substitute into the formula to find HP.

An 8-Cylinder Engine Has 1,500 Power Strokes Per Minute, a Bore