Performance data tables comparing a standard and supercharged 4-cylinder, 2614 c.c. Mercedes engine.
| Identifier | ExFiles\Box 22\5\ Scan134 | |
| Date | 18th November 1924 guessed | |
| MERCEDES SUPERCHARGER. 4-cyl. 2614 c.c's. Table 1: STANDARD R.P.M. | H.P. | B.HP. | Induction temp. C° 500 | 8 | 80 | 1000 | 17.8 | 84 | 1500 | 30 1/2 | 100 | 50 1750 | 34.8 | 98.2 | 53 2000 | 38.3 | 94.8 | 55 2250 | 41.2 | 90.8 | 57 2500 | 43.3 | 85.2 | 60 SUPERCHARGING H.P. | B.HP. | Induction temp. C° 6.5 | 124 | 17 | | | 124 | 80 44.2 | 125 | 90 57 | 126 | 90 55.2 | 122 | 95 58.3 | 116 | 100 Table 2: Power to drive blower. R.P.M. | H.P. 1500 | 1.8 1750 | 3 2000 | 4.5 2250 | 5.35 2500 | 5.8 2750 | 6.3 Gain due to Supercharger Actual. | % 7.45 | 24.6 9.4 | 27.0 12.7 | 33.2 14.0 | 34.0 15.0 | 34.6 17.5 | 40.5 Table 3: STANDARD R.P.M. | Induction pressure. | Compression pressure. 1500 | -.62 | 110 1750 | -.75 | 109 2000 | -.85 | 107 2250 | -1.03 | 2500 | -1.18 | 103 2750 | -1.32 | 101 SUPERCHARGING Induction pressure. | Compression pressure. 4.15 | 144 4.3 | 149 4.52 | 158 4.66 | 157 4.91 | 155 5.0 | 150 Table 4: PRE-IGNITION. Supercharging 2500 r.p.m. Time mins. | H.P. | Temp of induced charge. 0 | 60.5 | 70°C .5 | 57.3 | 100°C 1 | 56.2 | 110°C 1.5 | 52.0 | 115°C Violent pre-ignition commences. | ||
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).