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).
Technical memorandum detailing the specifications of an Alfa-Romeo clutch.
| Identifier | ExFiles\Box 124\5\ scan0074 | |
| Date | 11th April 1932 | |
| 8482 To E.{Mr Elliott - Chief Engineer} From Hs{Lord Ernest Hives - Chair}/Gry.{Shadwell Grylls} c. to Da.{Bernard Day - Chassis Design} By.{R.W. Bailey - Chief Engineer} c. to Wor.{Arthur Wormald - General Works Manager} c. to Da{Bernard Day - Chassis Design}/Ev.{Ivan Evernden - coachwork} Hs{Lord Ernest Hives - Chair}/Gry.{Shadwell Grylls}6/WJ.11.4.32. ALFA-ROMEO CLUTCH. Replying to Ev.{Ivan Evernden - coachwork}1/HP.6.4.32., we have collected the following details :- (1) The clutch has six driving plates with a ring of Ferodo bonded asbestos rivetted on each side. The outside and inside diameters of the Ferodo are 5.625 and 4.25 respectively. The driving plates are splined on the outside and the driven plates on the inside. The latter have saw cuts radiused at the ends. The Brinell of the driven plates is 133. (2) The spring pressure due to the one helical spring is :- With clutch engaged 114 lbs. With clutch fully disengaged 150 lbs. The spring has six working coils of .236 wire and has an outside diameter of 1.930. (3) The clutch will just transmit a torque of 100 lbs. ft. giving a coefficient of friction of .353. (4) The total plate separation on to the stops in the clutch is .200 but we cannot say whether the pedal travel allows all of this to be used, until the car is assembled. Similarly we are unable to give the pedal pressure. Hs{Lord Ernest Hives - Chair}/H.Grylls. A sectional drawing will follow. | ||