Gas-Engines and Producer-Gas Plants / A Practice Treatise Setting Forth the Principles of Gas-Engines and Producer Design, the Selection and Installation of an Engine, Conditions of Perfect Operation, Producer-Gas Engines and Their Possibilities, the Care of Gas-Engines and Producer-Gas Plants, with a Chapter on Volatile Hydrocarbon and Oil Engines

by Rodolphe Edgard Mathot

Fig. 140.

II. Determination of the Resistance to Suction and Exhaust.—Influence of the tension of the spring of the suction valve and of the section of the pipe. Effect of the section of the exhaust-valve and of the length and shape of the exhaust-pipe:

A very light spring is utilized, the travel of which is limited by a stop so as to obtain on a comparatively large scale the depressions and resistance respectively represented by the position of the corresponding curve, above or below the atmospheric line (Fig. 141).

Fig. 141.

C.—Tension of the suction-valve: 2.9 pounds. Resistance to suction: ¹⁄₇ of an atmosphere (2.7 pounds).

D.—Tension of the suction-valve: 2.17 pounds. Resistance to suction: ²⁄₇ of an atmosphere (5.4 pounds).

E.—A chest is used for the exhaust. Resistance to exhaust: ²⁄₇ of an atmosphere (5.4 pounds).

F.—The exhausted gases are discharged into the air,