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

108 VAPORIZING OF PARAFFIN. whicli the outer casing is asbestos lagged, as also the pipe x leading thereto from the motor. According to this system, the vaporizer is fitted as an auxiliary, and can be applied in the manner shown to any motor, and with little alteration to any carburettor. In action, the motor is started on petrol with the throttle t open and t1 closed, when, after a few minutes, i1 can be opened and t closed without appreciable change in the running of the motor, which then continues apparently as steadily on paraffin as on petrol, and with approxiinately the same economy in consumption. In Fig. 83 the vaporizer is shown con- nected up to an ordinary four-cylinder petrol motor, and is, it will be seen, self-contained with its own float cistein and supply tank k. The perforated pipe k1 serves the purpose of a fuel jet, the oil thus being heated before mixing with air in the vaporizer. Injeetion Vaporizers.—Much scheming and endeavour has been and still continues to be devoted towards the improvement in the running of higli-speed paraffin motors, so as to adapt them for the use of this cheaper and safer fuel in such perfection as to render them suitable for all general and automobile purposes. But the difficulty is, the heavier and denser a liquid, the greater is its molecular cohesion, and explains the higher function played in the process of atomization of heavy oils than light; this is an important consideration in the vapor- ization of paraffin, as the more completely an oil can be atomized, the less the temperature required for perfect vaporization. In the first successful engines to run on paraffin, the vaporizer {vide Fig. 36) consisted of a com- paratively large exhaust jacketed chamber. into which the fuel was sprayed under pressure by a compressed-air