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).
Adjustment procedure for the 20/25 HP Carburetter, LOP E.60092, with a fully expanding throat and jet.
| Identifier | ExFiles\Box 102\1\ scan0195 | |
| Date | 18th July 1934 | |
| 45080 To Mx.{John H Maddocks - Chief Proving Officer} EP.{G. Eric Platford - Chief Quality Engineer} HS{Lord Ernest Hives - Chair}/CTS.{C. Trot Salt - Carburation}10/KW.18.7.34. 20/25 HP. Carburetter, LOP: E.60092. Fully expanding Throat and Jet. Initial Adjustment. Low Speed Jet. Before starting the engine, the lock nut should be released and the low speed choke screwed down as far as it will go. Then one complete turn in an anticlockwise direction, and the lock nut tightened up again. When the engine is warmed up, the L.S. choke should then be readjusted for correct mixture at 750 R.P.M. running light. Slow running is then adjusted by the eccentric at the throttle edge. High Speed Jet. For test bed work, the mixture will be noticeably weak, when the control is in the normal position, but for checking consumption the curve should be taken under these conditions. Power can be checked at the same time at each speed by adjusting the control to suit. This means that the tester will check two readings at each speed on the test bed, one for consumption, irrespective of power, and then another for maximum power by using the mixture control. Final Setting on the Road. For the final adjustment of these carburetters on the road, only the low speed jet should be altered. It should only be necessary to readjust the low speed Choke (at 750 R.P.M. running light) and the eccentric at the throttle edge for tick over. Both these adjustments should be made after the car has been warmed up to a normal working temperature on the road. Hs{Lord Ernest Hives - Chair}/C.T. Salt. | ||