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).
Critiquing a system of extra oiling controlled by vacuum in the induction pipe.
| Identifier | ExFiles\Box 16\1\ Scan075 | |
| Date | 12th March 1915 | |
| Wor{Arthur Wormald - General Works Manager}/EHS/L12315. OC 740 . Re Extra Oiling controlled by vacuum in Induction Pipe. Na{Mr Nadin}/Mr Southern. 12.3.15. In reply to Mr Royce's memo R1/IB24215, I still cannot appreciate the claims for this system of oiling. Attached herewith is a curve which was taken on a standard engine. The engine was run full throttle at 2000 revs. and the vacuum measured. As I understand it with that amount of vacuum the extra oil is on full. We then decreased the speed of the engine by applying more load and gradually closed the throttle so as to maintain the same vacuum in the induction pipe. If I understand this scheme correctly this curve represents the amount of throttle opening and the revs that the extra oil would be working. It will be seen that on the curve the vacuum in the pipe at 300 revs. ( 9 miles per hour) with the throttle only opened to the extent of the slots is the same as at 2000 revs. with full throttle. I do not think we can expect very good results from this system as the engine would get full extra oil when it is pottering along at low speeds and doing hardly any work, it may work on | ||