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 British Made Borg & Beck Clutch, Type 9 A1-G (Unit Type).
| Identifier | ExFiles\Box 128\2\ scan0117 | |
| Date | 28th January 1932 guessed | |
| SHEET 2 9 A1-G BRITISH MADE Borg & Beck Clutch SPECIFICATION TYPE 9 A1-G (UNIT TYPE) For transmitting not over 135 lbs. ft. torque, normal Passenger Car Service. 105 lbs. ft. torque, Truck or Bus Service. Facing size 8⅞ ins. × 6⅛ ins. × ⅛ in. Total facing area 32.4 sq. ins. Six springs with 1100 lbs. total plate pressure for maximum capacity. Unit pressure per sq. in. 34 lbs. with maximum spring pressure. Mean radius 3.75 ins. Clutch release lever ratio 4.6 : 1. Release bearing travel required to release clutch ⅜ in. Wear-in space to be provided in addition to release bearing travel—⁷⁄₁₆ in. Recommended release pedal ratio—10 or 12 : 1. *Pressure required at release bearing approximately 275 lbs. with maximum springs. Available with following S. A.{Mr Adams} E.{Mr Elliott - Chief Engineer} ten spline fittings : 1⅛—1¼—1⅜ ins. Can be installed in No. 5 or larger S. A.{Mr Adams} E.{Mr Elliott - Chief Engineer} bell housing. Release bearing—Carbon Graphite—furnished with clutch. Means of adjustment for wear—Pedal only. Weight cover assembly (added to flywheel) 13 lbs. Weight driven plate (added to transmission shaft) 2 lbs. Total weight 15 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 | ||