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).
List of tests and considerations for an OHC engine's valve gear, induction system, and related components.
| Identifier | ExFiles\Box 155\2\ scan0024 | |
| Date | 30th December 1936 | |
| -3- No.30 Bed. OHC Engine. (1) If when the inner valve springs are removed the valve bounce speed comes below 4500 RPM. (2) Balancing cam, effect of flywheel removal and tensioner on driving side being removed. Effect of balancer springs 20/25 and Bentley. (3) During test (1) it should be noted whether the removal of the inner valve springs helps in eradicating the chain periods. (4) Running with 1 inlet valve/cylinder only in conjunction with the balancer, are chain periods completely cured? (5) Expansion of exhaust valves and record of the temperature. (6) Whether any simple experiment of felt washers both under the screw heads and the joint face of the rocker cover helps in cutting down the noise of the valve gear which in its existing form brings up the noise. (7) Obtain detail weights of reciprocating parts of valve gear, also standard Bentley. When completed by HPS.{Horace Percy Smith - Experimental Factory Mgr} the following to be tested:- (1) Smaller induction system and carbs. (2) Cover for quietening the balancer mechanism. (3) Cast exhaust manifold. When we have covered the above jobs a report to be issued covering:- (1) Joint cylinder head faces with possibility of using C. and A.{Mr Adams} gasket on account of high cost of corrujoint. (2) Assuming from test (1) we cannot run with weaker springs than existing ask for overhaul in design of valve gear to give reduced spring loadings (Cam accelerations and weight of parts). (3) Possibility of single inlet valve/cylinder. (4) Rocker cover as per P.III not bolted to cam mechanism. | ||