Question 154Motor Plants - Assistant Engineer

The correct answer is A) formed by the connecting rod and the cylinder centerline. During the power stroke, the side thrust of a trunk type piston is a result of the angle formed by the connecting rod and the cylinder centerline. As the piston travels down the cylinder, the connecting rod is at an angle relative to the cylinder centerline, which creates a side force on the piston and cylinder walls. This side thrust is a normal occurrence in internal combustion engines and needs to be accounted for in the engine design. The other answer choices are incorrect because they do not directly relate to the side thrust generated during the power stroke. The angle between the piston and piston pin (B), the angle between the crank arm and crank pin (C), and the angle between the master and link connecting rods (D) do not contribute to the side thrust of the piston.