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).
Autovac tests measuring petrol flow for the Phantom II, Standard Continental Phantom, and a new 8 litre engine.
| Identifier | ExFiles\Box 40\4\ Scan369 | |
| Date | 18th May 1933 | |
| Files. X3879. 18.5.33. AUTOVAC TESTS. The tests were for the purposes of checking the petrol flow from the standard Phantom II autovac. The autovac and complete pipe line, filters etc. were fitted up in the same relative positions to each other and the engine as in chassis. The engine was run from separate petrol supply at speeds varying from 2500 to 3000r.p.m. It was found that the speed had no effect on the flow at high speeds as pump suction was quite adequate to keep autovac full of petrol. The maximum flow so obtained was measured - mean of three readings given below :- Time for 1 quart - 75 secs. Flow - 96 pts/hr. Flows required, (Mixture strength taken as .65) Standard Continental Phantom. Complete exhaust system - B.H.P. - 140 Flow required 91 pts/hr. Cut out open - BHP - 158.6 Flow required 103 pts/hr. New 8 litre engine Cut out open - BHP - 183. Flow required 119 pts/hr. From consideration of these tests it appeared that any restriction in flow was due to lack of hydraulic head of the autovac above carburetter inlet. However in view of the fact that the floatchamber has a depression on it of over 6" water with standard air silencer, it was decided to fit autovac in correct relative position to | ||