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).
Test report comparing the performance of original and modified autovac filters.
| Identifier | ExFiles\Box 40\4\ Scan205 | |
| Date | 21th January 1927 guessed | |
| -5- After every 5 mins. running the throttle was eased off for 1 min. to allow the autovac to fill up (This is the standard test). (1) Using the original new type filter the engine ran through the test up to 7 1/2 mins, at 1750 r.p.m. when the Autovac was emptied and the engine received no petrol. (2) Using the modified new type filter the engine ran through up to 4 1/2 mins. at 2000 r.p.m. without running short of petrol, at which point it failed. N.B. The modification to the filter consisted of opening the holes A, out to .250" dia. from 3/16", and opening the hole B, out to .3125" dia. from 3/16" dia. ----------------- HS{Lord Ernest Hives - Chair}/AJL. | ||