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 discussion on fitting automatic lubrication systems, detailing accumulator options for PI and PII cars and service schemes for the sphere and torque tube.
| Identifier | ExFiles\Box 27\1\ Scan331 | |
| Date | 10th September 1929 guessed | |
| - 6 - FITTING AUTOMATIC SYSTEMS IN SERVICE Undoubtedly after a time existing PI and PII cars in this country will have to be altered to automatic systems to satisfy customers. The best combination will apparently be - One-pint tank attached to oil filler with vacuum operated pump incorporated delivering about .06 cc per stroke or .5 cc per mile (average). Large size HP. accumulator on dash delivering 25 cc per shot. One shot every 50 miles - 70-80 lbs. pressure. On PI, a large L/P. accumulator for sphere and torque tube, capacity 50 cc taking 40% of the total oil, and thus discharging once every 250 miles, 8 cc to torque tube, 42 cc to sphere. It would be possible with this arrangement to put both accumulators under the bonnet and connect to the existing pipe lines for the sphere and torque tube. The low-pressure accumulator would simply take the place of the existing oil pot. PRESENT SERVICE SCHEME FOR FEEDING SPHERE & TORQUE TUBE The trouble with scheme as on MX{John H Maddocks - Chief Proving Officer}-5 is that it is entirely too expensive to fit. We must cut out all work under the car, use existing feed pipes and simply fit a L.P. accumulator in place of the oil pot connected direct to the present hand pump. The special drip plugs on sphere and torque tube were not used on MX{John H Maddocks - Chief Proving Officer}-5 (See report RHF-18 - July 22/29). The relative discharge (5-1/2 to 1) was given by the resistance of the two pipe lines. With the accumulator mounted under the bonnet the line to torque tube will have to be restricted by a small diameter passage at the accumulator to get correct proportion of feed. A smaller drip plug, say #470 of half the flow of present plug #473, will have to be used in the accumulator, because of its average higher temperature. This should reduce the cost of the installation by fully 50%. PRESENT DERBY FOOT PUMP Mr. Thomas points out that the intake valve on this pump is held closed by a light spring. They have found it necessary to restrict this valve to a short stroke but to have it stay normally open by its own weight. - continued - | ||