From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Leaflet detailing the scheme of throttle working, fitting instructions, and adjustment for the Orkan Small-Car Carburetor Type 'K'.
| Identifier | ExFiles\Box 122\4\ scan0038 | |
| Date | 11th September 1927 guessed | |
| Panel 1: ORKAN SCHEME OF THROTTLE WORKING fig. 2, fig. 3, fig. 4, fig. 5 In the position for running slowly (fig. 2) a quantity of supplementary air enters through the throttle openings opposite the air intake, and is added to the already existing mixture, the mixture getting the form of a delicate spray, passing through the bore of the throttle axle and the opening a), and entering the induction pipe. At a little opening of the throttle (fig. 3) the mixture in the throttle axle is divided, the one branch providing the device for running light, which continues acting, whilst the other branch flows through the cross bore of the axle and the throttle to the port of the throttle, where the spray of mixture is atomized once more and poured into the air passing at high speed. The supply of fresh air has diminished, and the leaving mixture has increased in quantity and richness. By the further opening of the throttle (fig. 4) the addition of fresh air delivered through the ports of the throttle is reduced whilst the supplied mixture increases in quantity, until, By the complete opening of the throttle (fig. 5) all ports of the throttle are engaged by the suction of the motor and supply only mixture. In the meantime the fuel level in the inner and outer chambers of the fuel nozzle has sunk as far as to permit air to enter through the opening from the outer chamber of the fuel nozzle to the atmosphere, and to mingle with the fuel. By means of this brake air added to the fuel the consumption for high speeds is automatically regulated. The inserted air-intake limits the quantity of air passing along the throttle, and consequently the degree of admission to the cylinders at high speeds. Panel 2: ORKAN FITTING UP THE CARBURETOR 1. The carburetor should be flanged to the motor directly, so that the float chamber is on the top, and a soft packing should be inserted. 2. It is necessary that an efficacious filter be inserted into the fuel pipe. The duct should be as short as possible, having no vertical loops. The float chamber may be turned to a suitable position. 3. The gas gear should have no lost motion and should give way to the full opening and closing of the throttle. 4. For the operation of the suction shell a suitable Bowden wire should be arranged having its lever near the hands of the driver. 5. When a vacuum tank is employed the vacuum tube may be fixed on a shoulder of the flange of type K 26 mm. ADJUSTMENT One adjusts the „Orkan“ carburetor by selecting the suitable air-intake, fuel nozzle and air inlet. The suitable sizes are found together, when the motor is performing its maximum power. The size of the air inlet may be fixed afterwards, the air inlet influencing specially the consumption at high speeds. It should be taken, therefore, as large as possible with regard to the good working of the motor when running light and in the transitions. The device for running light may be adjusted by screwing off the crusted nut fixed on the lower end of the throttle axle. By screwing off same the passage for the mixture, which was checked before by means of the needle, becomes free, and the mixture for running light grows richer. The opening of the throttle desirable for running light may be fixed by the stop screw. As the device for running light continues supplying at full load, and as it depends on the sizes of the fuel nozzle and the air inlet it must be had regard to when the carburetor is exactly adjusted. The motor is preferably started in the position for running light. When the engine is cold the rotatable shell may be removed, so that the air supply is checked. Also when the nozzles or ducts are choked it is sufficient to remove the shell, because by this procedure made when the motor is running an efficacious rinsing of the nozzles and ducts is obtained. Panel 3: »ORKAN« SMALL-CAR CARBURETOR TYPE ,,K” for small cars and motors SUEDDEUTSCHE BREMSEN A.{Mr Adams}-G.{Mr Griffiths - Chief Accountant / Mr Gnapp} MUENCHEN 46 ~ GERMANY | ||