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).
Road tests of a 112° 'China' camshaft, comparing performance against 'Standard' and 'Japan' configurations.
| Identifier | ExFiles\Box 5a\5\ 05-page122 | |
| Date | 19th May 1930 | |
| NOT SENT OUT. X5771 To H.{Arthur M. Hanbury - Head Complaints} From Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} c. to SS.{S. Smith} Wor.{Arthur Wormald - General Works Manager} c. to SE. E.{Mr Elliott - Chief Engineer} c. to EP.{G. Eric Platford - Chief Quality Engineer} Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}6/AJ.19.5.30. X.5090. X.5771. X.5770. 112° CAMSHAFT 'CHINA'. We have tried the long duration camshaft on the road in conjunction with a 5 3/4 to 1 compression ratio. Above 30 M.P.H. the gain in performance is appreciable. The greatest difference being between 50 and 60 M.P.H. The figures for our standard test hill, about 3/4 mile long with a gradient such that starting at 10 miles per hour a speed of 35 miles per hour can be obtained at the finish, are asfollows :- | Standard 'China' | 112° Camshaft 'China' | 'Japan' | |------------------|-----------------------|-------------| | 67.6 secs. | 62.4 secs. | 62.4 secs. | We should say that there was definitely more tendency to detonate than standard on the 112° camshaft 'China' but only at the lowest speeds, otherwise, we should say that it behaves in the same way as a standard car for roughness, engine vibrations, etc. The improved performance at the normal cruising speeds was quite marked, but comparing this car with 'Japan' we do not get the rapid response to the throttle opening which is a feature of 'Japan', and we miss the increased low speed torque that we get with the turbulent head. The results so far obtained on the test bench shew | ||