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).
The performance, error margins, and potential application of a Measuring Autovac and Galometer fuel system.
| Identifier | ExFiles\Box 40\4\ Scan165 | |
| Date | 9th December 1925 | |
| EXPERIMENTAL REPORT. -4- Expl. No. outer reservoir being empty at the time of starting up, the level C. is very low and the float is working strenuously to bring it up to the level C. in Fig.1. In the case of the amount of petrol which goes through the flap valve D.{John DeLooze - Company Secretary} is equal to the volume contained in the float chamber below the level A.{Mr Adams}, i.e. all the petrol in the float chamber is emptied, whereas in Fig.1. the amount emptied is the difference between the levels A.{Mr Adams} and B. In each case the float chamber will be filled up again to A.{Mr Adams} thus in case 11. more petrol is being drawn in per stroke than in case 1. The Galometer however will still register the same viz. .002 galls. per stroke. Fig.11. shows the max. error which can occur. This error amounts to 7% in the Galometer we have tested; the Galo- meter registering 7% less petrol used than has actually been used. When working normally, as in Fig.1. it was found that the Galometer under test registering 3.5% high. The Measuring Autovac is fitted with a non-return petrol valve in addition to the air and suction valves. This is shut each time the suction valve shuts and opens each time the suction valve opens. It is interesting to note that the inclusion of this valve has had no beneficial result upon the richening up of the induction pipe mixture when the Autovac functions. The Measuring Autovac mechanism can be fitted into the existing Phantom tank; the useful tank capacity however will be smaller owing to the greater stroke of the measuring Autovac and lower petrol level. contd :- | ||