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).
Comparing the performance of small and large bore engines in a 4¼ litre Bentley.
| Identifier | ExFiles\Box 82\4\ scan0252 | |
| Date | 19th February 1936 | |
| W/S Cx.{Major Len W. Cox - Advertising Manager} x 200 Hs{Lord Ernest Hives - Chair}/Gry.{Shadwell Grylls}10/KW.19.2.36. Re 4¼ litre Bentley. We send you herewith some figures that Mx.{John H Maddocks - Chief Proving Officer} has taken of the small and large bore engines fitted in your trials car B-83-FC. This is the actual power of the engine with the exhaust system which it has in the car. Acceleration figures are also attached. During a short run on the road we found that at 40 m.p.h. the acceleration of the large bore in top gear was almost exactly the same as the small bore car in third gear. We still have no figures for the petrol consumption, but Mx.{John H Maddocks - Chief Proving Officer} is doing some tests shortly. Hs{Lord Ernest Hives - Chair}/Gry.{Shadwell Grylls} | ||