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 pressure tests through a governor passage, with results tabulated at various speeds.
| Identifier | ExFiles\Box 179b\2\ img223 | |
| Date | 23th December 1932 | |
| -2- A further test was made to see how much oil could be passed through the small passage C. sealed by the governor ball, before appreciable back pressure was set up. The oil used was Compressor at 150C. One pound per sq.in. was considered appreciable back pressure. The oil was supplied at point B. the three way delivery stud of the governor, which was connected to A.{Mr Adams} by 1/4" diameter pipe and banjo. Pressures were measured at B. and A.{Mr Adams}, the figures obtained being as follows :- TABLE: | Equiv. Road Speed M.P.H. | Pump Press. Initial lbs/sq.in. | Pump Press. When release Press. incr: by 1 lb/sq.in | Release Press Initial lb/sq.in | Release Press + 1 lb/sq.in | Delivery through release valve at R+1 lb/sq.in | |---|---|---|---|---|---| | 30 | 3 | 5 | 2 | 3 | 25 pts/hr. | | 60 | 8 1/2 | 10 1/2 | 7 1/2 | 8 1/2 | 29 pts/hr. | | 80 | 14 1/2 | 16 | 14 | 15 | 24 pts/hr. | It will be observed that with this oil at 150C. the governor valve begins to have a viscosity factor when a delivery of about 25 pts/hour is reached. The governor pump delivery against average back pressures is shewn on curve HS.{Lord Ernest Hives - Chair}803. It will be observed that the pump delivery does not follow the straight line law within the working speeds when Motorine C. is used (which is equivalent to Compressor Oil at 0°F.{Mr Friese}) This is one reason why we wish to keep the oil viscosity down. When Motorine C. is used the restriction of the governor orifice at once becomes considerable as is shewn by the following figures :- | ||