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).
Extract discussing the modification of connecting rods and pistons to prevent engine knock.
| Identifier | ExFiles\Box 77\1\ scan0014 | |
| Date | 3rd April 1924 | |
| X.2974 Extract from RL/M3.4.24. RE EAC. COMBINED MAGNETO & BATTERY IGNITION AUTOMATIC ADVANCE. (RR. HYDRAULIC RELAY). X.3949. X.2974. X.9030. In addition it is assumed that the con. rods may require lengthening, and every fraction of weight removing from the reciprocating end of the con. rod and piston. I assume that we have the lightest type of pistons which do not knock.. How much lighter would Ricardo's be ? Has he succeeded in preventing knocks ? R.{Sir Henry Royce} | ||