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).
Test report for a Riviera Trials car, detailing its specifications, performance against another chassis, and dynamometer results.
| Identifier | ExFiles\Box 71\3\ scan0272 | |
| Date | 2nd February 1924 guessed | |
| - 3 - Riviera Trials car and its specification is identical with 107-MG. Accelerating from 10, 20 and 30 mph. the chassis had the advantage. A test was also made to see if one car would overtake the other. There was no advantage in these tests, the performances being about equal. The shock absorber loading is as follows:- Front off side 72 Lbs. Front Near 45 Lbs. Rear (Hartford shock absorbers) Off side 30 Lbs Rear " " Near " 53 Lbs. Tyre pressures, front 40 Lbs. Rear 35 Lbs. Compressions 60 and 58 Lbs. Capacities, 25.5 cubic inches. Valve Timing - I.O. 3 I.C. 9½ E.O. 21½ E.C. 2 Weight of complete car without passengers. Tons. cwts. qrs. Lbs. Front axle 1. 0. 0. 14 Rear axle 1. 1. 2. 14 __________________ Total. 2. 1. 3. 0 Ignition timing. Magneto ⅝ B.D.P. Battery 3¼ P.D.P. Petrol consumption was not taken on the road owing to insufficient time, but the consumption on the dynamometer was 35¼ p.p.h. A power curve was taken on the dynamometer and is shown on the chart attached, which also shows the minimum scheduled horse power and the power developed on this chassis when it left the Works as a high compression type. The results are rather disappointing. The power developed is below the schedule. Faircloth attributes this to the fact that owing to insufficient time, the chassis was not sufficiently warmed up. We are arranging to take a power curve of the chassis 4-YC under similar conditions, with similar tyres pumped to the same pressure. MX.{John H Maddocks - Chief Proving Officer} | ||