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).
Performance comparison graph showing horsepower, fuel consumption, and acceleration tests for a car converted from a 3.5-litre to a 4.25-litre engine.
| Identifier | ExFiles\Box 82\4\ scan0269 | |
| Date | 3rd March 1936 guessed | |
| B.83 F.C. TRIALS CAR CONVERTED FROM 3 1/2 TO 4 1/4 LITRE REVS PER MIN. H.P. PINTS PER HP HOUR R.P.M. MILES PER HOUR ACCELERATION TEST 3 1/2 LITRE 10 - 20 : 3 1/2 SECS 30 " : 7 4/5 40 " : 10 50 " : 14 60 " : 20 1/5 70 " : 26 3/5 4 1/4 LITRE 10 TO 20 : 3 30 " : 6 1/5 40 " : 8 3/5 50 " : 11 3/5 60 " : 16 70 " : 20 Graph Labels: 4 1/4 LITRE 3 1/2 LITRE UNIT TEST WITH CHASSIS EXHAUST SYSTEM SHOWING COMPARISON BETWEEN 3 1/2 & 4 1/4 LITRE ENGINES. THE LOWER CURVE IS OF ENGINE ORIGINALLY FITTED UPPER CURVE IS ONE NOW FITTED Handwritten text: Carried - Axle Ratio Type of axle etc | ||