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).
Analysis of engine running issues related to air supply, throttle, and fuel mixture.
| Identifier | WestWitteringFiles\P\2July1926-September1926\ Scan089 | |
| Date | 23th August 1926 | |
| Contd. -2- Its usefulness was extremely limited because if under one particular set of conditions enough air were admitted it would give an inadequate supply for larger throttle openings. Again it was found that the highest normal slow running induction pipe depression was greater than could be obtained under some condition of firing in the silencer; therefore the automatic valve of this type could not be employed to cure the latter without interfering with the normal running. If the air dilution system could be employed it would seem that we should probably still experience a few explosions on opening up after coasting with the throttle shut, due to "missing" a few charges as it changed from chiefly air to the correct normal strength. Similarly on closing the throttle after heavy load slow speeds when trouble could arise through the fuel clinging to the induction pipe walls. Effect of a rich mixture:- The mixture can be strengthened until the silencer explosions cease and the engine will fire the charge regularly. At a motoring speed of 1000 r.p.m. with the throttle adjusted until explosions take place in the silencer the consumption is found to be 3.5 pts/hr. and explosions will cease, giving place to regular firing, when richened up to 5.75 pts/hr. Contd. | ||