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).
Technical note on fan and water pump systems, with detailed figures for a sphere lubrication system.
| Identifier | ExFiles\Box 27\1\ Scan328 | |
| Date | 10th September 1929 | |
| - 3 - (7) Fan. Mr. Thomas had no suggestion for improving our present scheme. We know this works successfully and does not cause oil to be spattered around the bonnet or on to the belt like hand-lubrication is liable to do. (8) Water Pump. T. knows of nothing better than our present scheme with double non-return valve. Note however, report from Fuller last September Exp.-20 - Sept. 10/29, which shows that we may be putting rather more oil into the water system than is advisable for prevention of blocked radiators. With what Derby are doing in the way of improved gland packings and preventing corrosion, it seems probable that all need for lubrication of the Water Pump might be eliminated before long. Note re sphere lubrication - Following figures represent the final condition reached in this system on MX{John H Maddocks - Chief Proving Officer}-5 (RHF-18 - July 22) - .175 cc per shot of Vac. pump. 4 strokes per mile (Vac. feed avg. driving conditions). .7 cc per mile. 17.5 cc capacity of main accumulator. Discharges once every 25 miles. Of this discharge 10.25 cc goes to chassis lubrication. 7.25 cc goes to sphere accumulator. Capacity of sphere accumulator = 53 cc. Discharges once every 53 / 7.25 x 25 = 183 miles - sending 45 cc to sphere and 8 cc to torque tube. This is probably too liberal lubrication but since it represents a total oil consumption of only 1 U.S. quart in 1350 miles, there is no need to worry about it. (Dripping of oil on the floor seems no worse than usual). The present hand system however, may be taken as discharging 14 cc (one pump stroke) every 50 miles, or somewhat less than half the automatic system. In general pulling the handle every morning will add up to considerably more than this, but it is obvious that a careful test of a sphere lubricator on the hand system is necessary to establish desired frequency of operation. - continued - | ||