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).
Technical memo discussing pistons, clutch over-oiling, and alterations to the induction system.
| Identifier | WestWitteringFiles\G\June1921\ Scan14 | |
| Date | 8th June 1921 | |
| To R.R. of America Inc. -8- R10/G8/6/21 Contd. From R.{Sir Henry Royce} low grade fuel overoiling should cease. PISTONS. As regards the tightness of the pistons, the 6-ring piston was standardised a long time ago, and is undoubtedly superior to the 4-ring, but the 4-ring piston should not be unsatisfactory, as this piston is tighter, more gas-tight than the general run of pistons. Mr. Hives had the impression that you had changed to 6 ring pistons long ago. Nothing in the nature of an alteration to the pistons from aluminium to cast-iron can affect either the starting of the engine or the distribution of the petrol. In one case the pistons would not be hot, and in the other case the distribution must be equal before it arrives in the cylinder. We therefore think that the best policy is to fit the most recent aluminium pistons as we are now fitting to the cars in Derby. Cast iron pistons would cause increased trouble from detonations & seizing. CLUTCH OVER-OILING. There has been no change with this for many years. We regret, however, that some of the cars at Derby have been badly fitted up as regards effectiveness of the clutch lubrication valve and the worsteds have been too slack. This matter Mr. Platford knows all about. FURTHER NOTES WITH REGARD TO ALTERATIONS TO THE INDUCTION SYSTEM. As pointed out earlier, we find we have confirmed the necessity of applying heat close up to the carburettor. This is exactly the same as we have always been in the practice of doing with the water-jacketed throttle, and there is considerable advantage in applying still more heat to this part of the throttle, shewing the advisability of keeping the cooling water at the highest possible temperature, so that the water passing the throttle (Contd.) [Handwritten notes:] [Above 'pistons as we are now...'] we [Above 'CLUTCH OVER-OILING'] would cause increased [Below 'CLUTCH OVER-OILING'] X3409 X872 [Next to 'Mr. Platford knows all about.'] X 4305 X2758 | ||