Blueprint for a revised 20HP piston, detailing a stronger web and a multiple scraper scheme to address over-oiling.
| Identifier | ExFiles\Box 180\M3\M3.2\ img026 | |
| Date | 23th March 1925 | |
| SECRET TO R. {Sir Henry Royce} FROM E. {Mr Elliott - Chief Engineer} Copy to - SJ. HS. {Lord Ernest Hives - Chair} INDIA(Production 20 HP. with 4-speed box and Front Wheel Brakes) PISTON. Y50240 Please find attached a blue print of drawing Lec. 2036. shewing a 20HP. piston with a stronger diagonal web on the saw cut side, and a larger hole for saw cut arranged close to this web in all respects similar to the revised EAC. piston. At the same time since we understand that the 20HP. is rather inclined than otherwise to over-oiling, we have shewn the multiple scraper scheme for the piston rings. We do not suggest that this modification should be incorporated straight away in the India(Production 20 HP. with 4-speed box and Front Wheel Brakes) specification, but that it should go forward in the usual way as an improvement. E. {Mr Elliott - 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).