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).
Specifications and comparisons for various 8-cylinder engine configurations.
| Identifier | ExFiles\Box 133\1\ scan0199 | |
| Date | 13th May 1937 | |
| Rm.{William Robotham - Chief Engineer} 1129 typed 13.5.37 8 CYLINDER ENGINE. The overall length of the block of the 8 cyl. Wraith is 33 1/2". The biggest bore it will take is 3.125, giving a capacity of 276 cu.ins. or 4.53 L (4.500 stroke). R.A.C. rating 31.25 HP. tax £24. Estimated weight 40 lbs. less than Bentley. To give a capacity of 320 cu.ins. (5.24.L) the bore must be 3.375, increasing the length of the block to 35 1/2". R.A.C. rating 36.5 HP., tax £27, weight 7 lbs. less than Bentley. Using a C.I. block without liners, 320 cu.ins. could be got into a block length of 31 1/2. This is with .200 thick barrels and .200 of water between the nearest bores. The weight would be 80 lbs. more than the Bentley using a C.I.head or 40 lbs. more with an alum. head. Rm{William Robotham - Chief Engineer}/Smth. | ||