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 of components for three representative cars in the 20-30 HP class.
| Identifier | ExFiles\Box 126\1\ scan0097 | |
| Date | 15th June 1938 | |
| 1062 also 258 15bh. June 1938. WEIGHTS OF THREE REPRESENTATIVE CARS IN THE 20-30 H.P. CLASS. Gearbox complete with change speed. Bentley 90 lbs. 6 ozs. S.S. 89 lbs. 7 1/8 ozs. Oldsmobile 63lbs. Bentley-Aluminium case, four speed, synchro 2nd., 3rd. and 4th. S.S. -Cast iron case four speed, synchro 2nd., 3rd. and 4th. Oldsmobile - Cast iron case three speed, synchro 2nd. and 3rd. Engine and Clutch complete. Bentley 631 lbs. 12 ozs. S.S. 603 lbs. 7 1/8 ozs. Olds. 619lbs. 15ozs. Bentley - O.H.V. push-rod. Alum crankcase, cast iron block. S.S. - O.H.V. cast iron, monobloc. Oldsmobile - S.V. cast iron monobloc. Some reasons why, despite the use of an aluminium crankcase, the Bentley engine is the heaviest, are the flywheel weight of 50 lbs. as opposed to 25.5 on the Olds. Engine electrical system 63lbs. 4 1/4 ozs. as opposed to 51.45 lbs. on the Olds. Lower half crankcase 25 lbs. as opposed to 7.97 on the Olds. Fuel System less Carb. and Petrol Pumps. (with petrol.) Bentley 180 lbs. 3 ozs. S.S. 144 lbs. 9 1/2 ozs. Olds. 130lbs. 4 ozs. Fuel 18 Galls. 14 Galls. 14 Galls. Steering. Bentley 50 lbs. 13 3/4 ozs. S.S. 50 lbs. 15 1/2 ozs. Olds. 34lbs. 4 ozs. | ||