Correspondence concerning valve timing and camshaft forms for the 20 HP car, referencing blueprints of valve lift curves.
| Identifier | ExFiles\Box 33\4\ Scan135 | |
| Date | 8th June 1929 | |
| R. {Sir Henry Royce} C. Bgr. C. Worr C. Hs. {Lord Ernest Hives - Chair} C. Day X1770 BYL/G.8.6.29. X4090 X5090 X1440 CHINA(Experimental Engine). VALVE TIMING - RE CAMSHAFT. Referring to R1/M5.6.29, we had already in antici-pation of your views produced cam forms for the 20 HP. car, which follow closely all the improvements incorporated in the SS. {S. Smith} camshaft. We are sending herewith blueprints of Schs.1153/1158 showing the inlet valve and exhaust valve lift curves for the cam forms in question, and on the same drawings we have indicated the valve lift curves for the present type cam forms. We put the improved cam forms in hand immediately the larger bore was mooted, as it was evident that similar advantages would be required for the cam forms in this case under the new conditions as for the SS. {S. Smith} BY. {R.W. Bailey - Chief Engineer} | ||
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).