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).
Tests for an ignition oil relay leather piston ring.
| Identifier | ExFiles\Box 65\1\ scan0113 | |
| Date | 25th September 1924 | |
| R.R. 493A (50H) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF: Hs{Lord Ernest Hives - Chair}/GIR/L.G21. IGNITION OIL RELAY LEATHER PISTON RING. Tests carried out on S-EAC-11 unit. Chrome leather ring of wider section :- | R.P.M. | Flywheel ° advance. | Control ° advance. | Main oil pressure. | Relay oil temp. | Bearings. Oil temp. | |---|---|---|---|---|---| | 500 | 22 | 2 | 20 lbs/sq.in. | -- | -- | | 1000 | 29 | 6 | 22 | -- | -- | | 1500 | 38 | 13 | 22 | 51°C | -- | | 2000 | 48 | 19.5 | 22 | 57°C | -- | Total running above normal relay oil temp. 60°C = 4 1/2 hrs. 3 1/2 hrs. being at an average of 90°C CURVE TAKEN AT FINISH. | 500 | 21 | 1 | 14 | 91°C | 58°C | |---|---|---|---|---|---| | 1000 | 29 | 6 | 20 | 90°C | 58°C | | 1500 | 38 | 13 | 22 | 89°C | 57°C | | 2000 | 46 | 18.5 | 21.5 | 90°C | 58°C | Leather piston ring O.K. at finish, no sign of buckling. Wider section decided improvement. Relay body insulated one side only for 1/2 hr. at 90°C, with no difference to leather ring. Hs{Lord Ernest Hives - Chair}/GIR. | ||