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).
Piston design and compression ratio for the 'Hawk-Northcliffe' chassis.
| Identifier | ExFiles\Box 19\7\ Scan073 | |
| Date | 1st January 1923 | |
| To R.{Sir Henry Royce} from Hs.{Lord Ernest Hives - Chair} X790 hs{Lord Ernest Hives - Chair}4/LG1.1.23. X3408 X3773 X790 PISTONS ON "HAWK-NORTHCLIFFE". The pistons on the above Chassis are similar in design to the 40/50 HP. They are the split type with 4 rings. The rings are pinned in our standard manner at right angles to the gudgeon pin and alternately on each side of the piston. The compression ratio on the Hawk-Northcliffe is much higher than we use on the 40/50. The Hawk Northcliffe is 4.8 to 1 - 6.EX Car which is at W.W. and which has the present standard 40/50 HP. compression is 3.9 to 1. Hs.{Lord Ernest Hives - Chair} | ||