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 comparing four different camshafts on a single engine.
| Identifier | ExFiles\Box 108\2\ scan0197 | |
| Date | 16th January 1939 | |
| To Rm.{William Robotham - Chief Engineer} Rm.{William Robotham - Chief Engineer}/CTC.5/JH.16.1.39. CAMSHAFTS. Purpose of test. To compare four different camshafts on one engine. Method of Test. The engine used was a normal B.V. unit (B.V. No.1) Other parts in the engine remained constant throughout the test, enabling a true evaluation to be recorded of the merits of each camshaft. Also incorporated in this test, was the effect on each camshaft of two different induction systems. (a) Standard Wraith (Stromberg 42 m/m carburetter). (b) B.V. :- 2.S.U. (1 1/2" carburetters). Results. In putting the power figures on paper, we have taken as a basis for comparison the B.V. camshaft EB.3466 on which most of our previous development work has been carried out. Graph No. S.64. gives the power value for the experimental camshaft giving a firing order 1,3,5,6,4,2, instead of 1,4,2,6,3,5. our standard firing order. The comparison is taken with the Bentley V camshaft EB.3466. Actually the cam forms are the same for both shafts, only the firing order is different. Also shown on Graph S.64 is the relative power lost to the standard Bentley II exhaust system. Graph S.70 shows the difference between the two induction systems when applied to this camshaft. With reference to tappet noise on these difference camshafts, we shall evaluate this in the following way. The tappet clearance will be given, | ||