The Vaporizing Of Paraffin for High-Speed Motors
(Electric Ignition Type)

10 VAPORIZING OF PARAFFIN. the governor-controlled stop g, the spring lever s is per- mitted to close one valve v to the fuel supply f, and open the other to the valve n, which is opened during the admission strokes by a cam-operated lever k. In prac- tice, even with the most accurately constructed mechan- ism, a variation of injection feed caused by particles of solid matter adhering to the pump valves will, from time to time, cause the engine to run below its rated power; leakage past the pump does not occur to any consider- able extent, as the piunger p is operated mechani- cally in both directions, consequently the giand can be tightened well down without interfering with the action of the piunger. In several spirit engines of American make the piunger is operated by a cut-out gear, and the fuel regulated to the pump by a needle valve, and are for this reason capable of more convenient and accurate feed control than by a set-screw r as used in Fig. 1. A feature of this engine consists in the use of a weir over the inlet passage to the cylinder, thus any drip from the pump is caught and swirled into the compression space when the inlet n opens. A pump injection feed works at its best in an engine of the single-cylinder, slow-running type, although it has been used with success in high-speed multi-cylinder engines, as exemplified in the Wright and Adams- Farwell aero motors. As, however, the injection from a constänt stroke pump is influenced by valve leakage as well as by difference of level in the fuel tank, a pump carburettor having a variable governor controlled stroke has a certain advantage, especially when worked in con- junction with a regulated air supply. With this purpose in view, the pulsator carburettor shown in Fig. 2 was