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).
Specification sheet for a Borg & Beck 7¼ RD-G unit type clutch.
| Identifier | ExFiles\Box 128\2\ scan0115 | |
| Date | 28th January 1932 guessed | |
| SHEET 1 7¼ RD-G BRITISH MADE Borg & Beck Clutch SPECIFICATION TYPE 7¼ RD-G (UNIT TYPE) For transmitting not over 65 lbs. ft. torque, normal Passenger Car Service. Facing size 7¼ ins. × 4⅞ ins. × ⅛ in. Total facing area 21·2 sq. ins. Six springs with 650 lbs. total plate pressure for maximum capacity. Unit pressure per sq. in. 30·5 lbs. with maximum spring pressure. Mean radius 3 ins. Clutch release lever ratio 4 : 1. Release bearing travel required to release clutch 5⁄16 in. Wear-in space to be provided in addition to release bearing travel—⅛ in. Recommended release pedal ratio—8 or 10 : 1. *Pressure required at release bearing approximately 200 lbs. Available only with 1 in. dia. S. A.{Mr Adams} E.{Mr Elliott - Chief Engineer} ten spline fitting. Can be installed in No. 5 or larger S.A.E. bell housing. Release bearing—Carbon Graphite—furnished with clutch. Means of adjustment for wear—Pedal only. Weight cover assembly (added to flywheel) 9 lbs. 9¼ ozs. Weight driven plate (added to transmission shaft) 1 lb. 6¾ ozs. Total weight 11 lbs. * Makes allowance for friction in release mechanism and spring build up. Borg & Beck COMPANY LTD. BROCK HOUSE, LANGHAM STREET LONDON, W. 1. WORKS: LEAMINGTON SPA | ||