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).
Oil flow issues and recommending fitting the Phantom three-stage release valve to the new India engine.
| Identifier | ExFiles\Box 106\5\ scan0024 | |
| Date | 25th April 1928 guessed | |
| contd : -2- was the reduction in oil flow to the push rods and valves more remote from the end of the rocker shaft at which the oil supply was received, due to the resistance in the shaft and leakage through the rockers near the supply end. An improve- ment with regard to this was effected by leading a supply to each end of the rocker shaft. It was found easy to speed up the delivery to the rocker shaft parts by reducing the number of holes in the nozzle which sprays oil on the timing gears but this, due to restricting the release oil when in the cold state, resulted in a high main oil pressure when the engine was started from cold and increased the chance of damage to the oil gauge if the engine were raced before the oil was properly warm. The above schemes, principally the one with the drilled rocker shaft and an oil feed to each end, while being an improvement do not fill our wants and we consider there is need for a similar three-stage release valve system as used on the Phantom. We therefore recommend for consideration the fitting of the Phantom three-stage release valve scheme to the new India engine. HS.{Lord Ernest Hives - Chair} | ||