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).
Advantages of pistons with low-down rings.
| Identifier | ExFiles\Box 35\2\ scan 107 | |
| Date | 1st August 1919 | |
| To EH. from R.{Sir Henry Royce} Copy to CJ. " " BN.{W.O. Bentley / Mr Barrington} " " EFC. X. 2748. RE PISTONS. With reference to the pistons with rings low down, it was intended that the piston above the ring should fit the cylinder as closely as possible. The object of the low position of the ring was that they were protected from the heat, and not so liable to get gummed in the grooves, would better keep the oil from working into the combustion chamber, would hold the gas better, and would wear in their grooves less. In fact, there will be many advantages, providing that they are found to have no serious disadvantage. | ||