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).
Weight comparison table for Bentley car parts made from Aluminium Alloy versus Stirling Magnesium Alloy.
| Identifier | ExFiles\Box 88\3\ scan0027 | |
| Date | 2nd October 1933 | |
| FILES: x258 2.10.33 BENTLEY CAR - WEIGHTS. | PART. | Sp.{Mr Spinney} G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 2.73 Present Weight lbs. (Alum Alloy). | Sp.{Mr Spinney} G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 1.83 Weight in Stirling Magnesium Alloy (lbs). | |---|---|---| | Top Half - crankcase. | 47.5 | 31.8 | | Bottom Half - crankcase. | 28 | 18.75 | | Valve Rocker Cover. | 4.5625 | 3.06 | | Timing gear cover. | 5.0625 | 3.39 | | Induction Pipe. | 4.5625 | 3.06 | | Air silencer bend. | 2.75 | 1.84 | | Ignition tower. | 1.00 | .67 | | 6 - Pistons. | 6 | 4.02 | | Clutch pit with cover. | 12.75 | 8.54 | | Gearbox with all covers. | 25.5 | 17.1 | | Selector shaft casting. | 2.625 | 1.76 | | Fan brkt, pulley & end washer. | .6875 | .461 | | S.U. Carburetter parts (pair) | 4.375 | 2.93 | | Rear axle - centre. | 7.75 | 5.18 | | Shock damper castings (4) | 9.5 | 6.36 | | Dashboard. | 28.4375 | 19.05 | | Foot brake shoes (front)-(four) | 4.4375 | 2.975 | | " " " (rear )-(four) | 4.5 | 3.01 | | Hand brake shoes rear(four) | 3.4375 | 2.3 | | Steering column support bracket. | 1.25 | .836 | | S.U. Petrol pump central casting. | .875 | .585 | | Petrol tap base. | .875 | .585 | | Floorboards - cover over cl. pit. | .75 | .502 | | Spring shackle covers. | 2.75 | 1.84 | | Engine oil filler. | .75 | .5 | | Steering box cover. | .1875 | .126 | | Starter - main switch base. | .5 | .335 | | Dummy hub. | 2.0625 | 1.38 | | Wiring covers on dashboard. | .875 | .585 | | Floorboard - pedal plate. | 2.5625 | 1.72 | | Switchbox base. | .625 | .418 | | TOTAL. | 217.500 | 145.668 | Total saving in weights by using Stirling Alloy Magnesium in all places where alum. is used = 71.83 lbs. Hs{Lord Ernest Hives - Chair}/Lid.{A. J. Lidsey} | ||