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

91 CHAPTER V. ROAD CAR AND TRACTOR MOTORS. Paraffin, owing to its pungency and comparative difficulty of carburetion, whatever the method used for vaporizing, is an extrem ely difficult fuel to apply success- fully to the propulsion of road cars, especially for touring or pleasure cars. and to this may be attributed the reason that development in this direction has been held back to a considerable extent; but now, o wing to the rapidly increasing cost of petrol, coupled with a keener apprecia- tion of the economic advantages of a non-tax flash-proof fuel, renewed efforts have been recently made by motor engineers to produce a really successful high-speed paraffin motor especially adapted for the very trying conditions associated with the running of road cars. It has been demonstrated that the best results can be obtained with paraffin in a high-speed motor of the auto- mobile multi-cylinder type, when fitted with an exhaust- heated vaporizer of comparatively large capacity, and in which the proportion of air drawn through with the fuel feed does not exceed from 15 to 20 per cent, of the total volume supplied to the motor, when running opened out ; also that the air fed into the vaporizer for atomizing. as well as the diluent air added to the mixture., shall be varied in proportion to the fuel feed, thus producirig a constant mixture ; but even with these conditions