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

112 VAPORIZING OF PARAFFIN. gradients, the quantity of paraffin used was 47 gallons, which works out at over 20 miles per gallon, plus 1 gallon of petrol for starting. The motor was started 16 times on petrol and 18 times on paraffin ; the longest stop for restarting on the heavy fuel was 17 minutes, and the longest with temporary injection of petrol 45 minutes. In starting all cold, the longest period before changing- over was 4 minutes 20 seconds, and the shortest, with the motor and vaporizer warm, 10 seconds. Flame-heated Vaporizers.—The outstanding feature of vaporizing by externally or internally applied heat, whether from blow-flame burners, or by the combustion of a portion of the mixture, is the entire independence of petrol for starting. An example of the first of these methods is illustrated in cross-section by Fig. 86, shown applied to a four-cylinder motor designed for either auto or marine propulsion, and under conditions where the use of petrol woulcl be prejudicial, as. for instance, for inland navigation, or for road or rail cars in Burmah, South China, Siam, India, and other tropical countries, where, for reasons of safety in handling by unskilled attendants, a flash-proof oil is desirable. The essential feature of a motor fitted with the paraffin vaporizing system—known as the Gardner—consists in the use of a separate lanip-lieated vaporizer v for each cylinder, the motor in other respects conforming to the automobile or electric ignition type. The vaporizers are each pro- vicled with a separate float-fed single-jet spray nozzle j and burner b, which latter is encased in an aluminium wind shield. The burners which each project a silent blue flame around the base of the admission val ves are, together with the float cisterns, fed from a supply tank.