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 on a Bentley engine modified with special parts to replicate the 1936 Tourist Trophy race engine.
| Identifier | ExFiles\Box 83\3\ scan0093 | |
| Date | 15th March 1939 | |
| To Da{Bernard Day - Chassis Design}/Jnr.{Charles L. Jenner} Rm{William Robotham - Chief Engineer}/CTS.{C. Trot Salt - Carburation}10/JH.15.3.39. BENTLEY POWER. Purpose of test. Byt fitting similar parts (special) as used in the 1936 Tourist Trophy race, to produce a replica of the engine for use in the Paulin Bentley. Method of Test. Special parts are as follows. Cylinder Head. Ex.22954-A.{Mr Adams} Pistons. P.325 (strengthened Aerolite). Induction Systems. 1 5/8" bore pipe and 1 5/8 carburetters. Bearings. Extra clearance. Results. The normal power curve with special parts is shown on graph S.77. With special forward intake in position (Ellor) and corresponding forced draught, it will be seen that there is nothing to be gained by using the device below 130 M.P.H. It is interesting to note the effect on the depression in the induction pipe. When using the forward intake it should be noted that the carburetters had to be balanced in the following way. | ||