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).
Optimizing an internal combustion engine's induction pipe for varying speeds and conditions.
| Identifier | ExFiles\Box 147\2\ scan0083 | |
| Date | 19th September 1938 guessed | |
| internal combustion engine without the disadvantages of using a large induction pipe at small engine speeds. Normally a set figure at which the larger induction pipe comes into operation cannot be stated in miles per hour, because under certain road conditions it is possible to cruise at a relatively small throttle opening under which condition running on the small section of the pipe would enable maximum economy to be obtained. Road and wind conditions vary however so that a larger throttle opening can be required to maintain the same road speed. It is clear therefore that the action of opening up the larger bore pipe to augment the supply of the smaller one, must be a function of engine requirements. This requirement can best be summed up by the fact that the power developed in a given engine at any engine speed is in direct relation to the absolute pressure in the induction pipe at that engine speed. This is the variable therefore that should be made use of to determine when the larger pipe should be brought into action. It may be said therefore in describing the 6 | ||