Engine torque curves depend upon the combined effects of gas pressures, inertia forces, and weights. Tables for the harmonic coefficients of the torque due to inertia and weight effects are given for a wide range of crank-to-connecting-rod ratios. Families of indicator diagrams, representative of various types of engines, are shown and tables of the harmonic coefficients of the resulting torques are given. The types of engines considered are two-cycle gas, semi-Diesel, single-acting Diesel, double-acting Diesel, two-shaft opposed-piston Diesel, and four-cycle gasoline and Diesel engines.

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