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).
Speedometer calibration specifications for Bentley vehicles with different axle ratios.
| Identifier | ExFiles\Box 165\2\ img195 | |
| Date | 24th May 1939 | |
| 24.5.39 SPECS. EL.8/8, EL.8/8A, EL.8/8B, EL.8/8C. Bentley. The scale to be set out as hereunder :- True Speed. (m.p.h.) Indicated Speed. (m.p.h.) 10 10 - 12 20 20 - 22 30 30 - 32 40 40.5 - 42.5 50 51 - 53 60 61.5 - 63.5 70 72 - 74 80 82.5 - 84.5 90 93 - 95 100 103.5 - 105.5 110 114 - 116 Spec. EL.8/8. 10/43 Axle Ratio :- Calibration Speed of 762 r.p.mile for mileage recorder. Each instrument will be tested at :- 743 r.p.m. when indicated speed must be 60, +2, m.p.h. 1223 r.p.m. when indicated speed must be 100, +2, m.p.h. Spec. EL.8/8A. 10/41 Axle Ratio :- Calibration Speed of 727 r.p.mile for mileage recorder. Each instrument will be tested at :- 709 r.p.m. when indicated speed must be 60, +2, m.p.h. 1170 r.p.m. when indicated speed must be 100, +2, m.p.h. Spec. EL.8/8B. 11/41 Axle Ratio :- Calibration Speed of 660 r.p.mile for mileage recorder. Each instrument will be tested at :- 644 r.p.m. when indicated speed must be 60, +2, m.p.h. 1063 r.p.m. when indicated speed must be 100, +2, m.p.h. Spec. EL.8/8C. 12/41 Axle Ratio :- Calibration Speed of 605 r.p.mile for mileage recorder. Each instrument will be tested at :- 590 r.p.m. when indicated speed must be 60, +2, m.p.h. 973 r.p.m. when indicated speed must be 100, +2, m.p.h. BENTLEY MOTORS LTD. | ||