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).
Standard production test procedure for the Autovac petrol supply system.
| Identifier | ExFiles\Box 40\4\ Scan301 | |
| Date | 16th August 1929 | |
| (S.M.) X3579. To By.{R.W. Bailey - Chief Engineer} from Hs{Lord Ernest Hives - Chair}/Rn.{Mr Robinson} C: To Wor.{Arthur Wormald - General Works Manager} MX.{John H Maddocks - Chief Proving Officer} c. to Roy.{Sir Henry Royce} Hs{Lord Ernest Hives - Chair}/Rn.{Mr Robinson}1/MJ.16.8.29. X7510 X3579. In order to ensure that the petrol supply to the engine shall be adequate under all conditions with our new suction pump, it is essential that the Autovac shall operate efficiently. We find that the variation between the Autovacs as supplied to production is very considerable. Considering that the Autovac people charge so heavily for their instrument, we think that we should be in a position to demand the best that they can produce. We therefore recommend the following production test for Autovacs. STANDARD TEST. The Autovac tank should be fixed in an upright position, and connected to an S.S. vacuum pump by a standard suction pipe (5/16" dia. copper tubing, 66" long.) Petrol should be lifted through a standard petrol pipe (5/16" dia. copper tubing, 204" long.), the surface of the petrol being 35ins. below the union on the Autovac. The vacuum pump should now be run at 750 r.p.m. (1500 r.p.m. of engine), when delivery of the Autovac should not be less than 82 pints/hour. If the above delivery is not obtained, the bouyancy of the float should be checked. When the float is detached from the valve mechanism, it should float in petrol (S.G.=.75) in such a position that the top edge stands .700" above the surface of the liquid. (The lighter the float, the less the petrol delivery.) | ||