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).
The divergence of American practice from the Derby standard on pinning pistons and piston rings.
| Identifier | ExFiles\Box 181\M7\ img043 | |
| Date | 28th November 1922 | |
| TO-BJ. FROM R.{Sir Henry Royce} c. to CJ. HS.{Lord Ernest Hives - Chair} DA.{Bernard Day - Chassis Design} c. to HY.{Tom Haldenby - Plant Engineer} MP. OY. ORIGINAL RRLA HO/50 R3/M28.11.22. DERBY RR/A/Inc C to EX file RE. AMERICAN PRACTICE. Y2748 X3666 X.741 We learn from EP.{G. Eric Platford - Chief Quality Engineer} that Springfield have ceased to pin the pistons. It has been our practice ever since we made cars to pin the piston rings to prevent all the joints getting opposite one another, and to prevent joints getting in the wrong place. They should definitely be on that side of the piston where the piston presses on the cylinder wall due to the angularity of the connecting rod. They should also alternate from side to side only varying from the exact right angles to the piston pin sufficient to break the joint. If they are not using the orthodox split rings in America then there may be some excuse for not pinning them, but even this practice would be wrong, because they should have been submitted to Derby. We must have all the cars built to the same designs and practice, and details of manufacture. R.{Sir Henry Royce} | ||