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).
Lubrication apparatus dependent on induction pipe vacuum and its potential as an exclusive fitting for aero engines.
| Identifier | ExFiles\Box 16\1\ Scan069 | |
| Date | 24th February 1915 | |
| To Na.{Mr Nadin} from R.{Sir Henry Royce} 2. COPY. R1/IB24215. action the extra oil. The scheme that depends upon the vacuum in the induction pipe, and which supplies oil inversely proportionate to a vacuum in the induction pipe is correct, as it takes into consideration the speed, and it has good points. That is, while there is sufficient charge going into the cylinders to create a pressure and heat in the combustion space, lubrication would be permitted. As that charge decreases (through closing the throttle) the oil decreases. I have pointed out earlier in this note that the apparatus would be so arranged that it would take more than a 1.lb vacuum to operate it and cause reduction in the oil supply to the cylinders. You will notice also that we could, with this apparatus, damp it by oil below the piston, so that for very short openings of the throttle, such as is used in town work, no extra lubrication would be supplied. Referring as to whether it is positive or not, I feel sure it would be quite reliable, and only require a strainer to keep any grit from getting in any part of it. There is still another aspect to look at it, and that is, it could be made an exclusive Rolls-Royce fitting, and it might be a very valuable appliance to put on the aero engines, as it would require no connecting up, except the small pipe. I should be glad, therefore, if you will reconsider it. F.H.R. | ||