All About Engines

The Petrol Motor 215 There is also a form of mechanical vaporiser, in which the spray produced is so fine that it forms a mixture with air which is easily ignited. Engines fitted with a vaporiser of one form or another are intermediate between the petrol engine proper and the oil engines to be described in the next chapter. They differ from petrol engines only in the means for convert- ing a less volatile liquid fuel into vapour. Engines for Motor-cars The number of makes of motor-car engines is so great that if details were discussed it would be diffi- cult to know where to stop. We shall, therefore, confine attention in this section to one well-known type, selecting for that purpose the engine made by Wolseley Motors, Limited, of Birmingham. On Plate 19, Fig. 121, will be found a view, half in section, of the 16-20 horse-power four-cylinder Wolseley engine, as seen from the water pump and magneto side. Each important part is marked on the drawing with a figure, and the index to parts will enable the con- struction and mode of operation to be understood without difficulty. Fig. 122, Plate 20, shows a similar view from the carburettor and oil-pump side. For the sake of the reader who wishes to examine the construction a little more closely a line drawing of the complete section is given in Fig. 123. In this drawing three pistons are shown in outside view, and one_-that on the left—in section. It will be noticed that the crank case carry- ing the bearings is in two parts, bolted together and