Test report on modifications to S.U. carburetter float chamber covers and needle seats.
| Identifier | ExFiles\Box 31\5\ Scan088 | |
| Date | 27th July 1933 | |
| X1481 To E. {Mr Elliott - Chief Engineer} from Hs {Lord Ernest Hives - Chair} /WB. {Mr Brazier / Mr Bell} Hs {Lord Ernest Hives - Chair} /WB. {Mr Brazier / Mr Bell} 13/KT.27.7.33. MODIFICATION TO S.U. CARBURETTER FLOAT CHAMBER COVERS - FURTHER TO REPORT Hs {Lord Ernest Hives - Chair} /WB. {Mr Brazier / Mr Bell} 8/KT.15.7.33. Covers fitted with .125" Needle Seats used on No.5 Test Bed Engine These tests were performed with a pump delivering 171 pts/hr. at 2000 r.p.m. with full Bensport(Codename for 3 1/2-litre Bentley) suction, and delivery systems. The only apparent modification from standard on these covers was the increase of the valve seat to .125". The tests were also repeated with the previously modified covers. Delivery Pts/Hr. Reduction Open Pipe. With Modifications % 2E. Float Chamber Covers complete. .125" needle seats. 171 156 8.75 3E. Needles Removed. Float Chamber Covers 171 167 2.34 4E. only - No needle seats - Standard. 171 169 1.17 2F. Float Chamber Covers complete - .093" Needle Seats - Standard. 171 153 10.5 3F. As for 2F. Needles Removed. 171 163 4.8 Float Chamber Covers Previously Modified - Tests Repeated 2D. Float Chamber Covers Comp. .250" Ports. .125" Needle Seats. 6 Release Ports. 171 160 6.45 3D. Needles Removed. 171 169 1.17 4D. Float Chamber Covers Only - No Needle Seats - 171 171 0 The maximum pressure at 2000 r.p.m. registered 5.2 lbs/sq.in. at this setting whereas with the previous pump the max. pressure was 4.7 lbs/sq.in. Cont'd. {John DeLooze - Company Secretary} | ||
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).