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).
Description of the engine's cooling and supercharging systems, including details on pumps, vanes, and relief valves.
| Identifier | WestWitteringFiles\O\2January1926-March1926\ Scan36 | |
| Date | 28th January 1926 guessed | |
| contd :- -4- The pumps are driven by the first set of spur timing gears - driven off the crank. COOLING. A water pump is driven off the gear on the exhaust side of the engine corresponding to the one driving the oil pumps (inlet side). Capacity of water system approx. 2 gallons The supercharger is cooled by radiating fins. SUPERCHARGING. The supercharger vanes (or rotors) are lubricated by mixing lubricating oil with the fuel. 1 vol. Wakefields A/40 vols. petrol. The carburetter is on the suction side of the blower. The two vanes, each 150 mm. long X 128 mm. dia. rotate in ball bearings and are inter-driven by spur timing gears, housed in a separate gear chamber in front of the blower. The gears are lubricated from the engine system and are carefully cut with a minimum of back-lash to avoid interference in the blower vanes. The blower delivery pipe (dia. 2 1/4" inside) is fitted with two relief valves - one, a large one (about 2" dia.) at the bend where the blower pipe curves upwards to meet the induction manifold (see sketch), is set at about 18 lbs/sq.in. and is a safety valve in case of back-firing. The second one (about 1" dia.) is fitted near the blower outlet at the first bend in the blower pipe. This is an adjustable relief valve and may be regulated to suit the blower pipe pressure required (8 lbs/sq.in. max. at 3000 r.p.m. was used). The 'relieved' mixture is led back contd :- | ||