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).
Notes on a lubrication issue where increasing gudgeon pin length cured piston knocks.
| Identifier | ExFiles\Box 16\1\ Scan012 | |
| Date | 26th October 1909 | |
| H.R. 40(20)d H.{Arthur M. Hanbury - Head Complaints} 100/15.09 R.P. 4941. X700 1400 Lubrication - on 110 J.{Mr Johnson W.M.} Gudgeon pins collecting flat increased in length from 1 1/4 to 1 7/8 - two circular grooves round end of bush to suit. Cured piston knocks - apart from extra oil. Could be very same by varying oil pressure - similar amt. of smoke, at exhaust. engine. CP 26/10/09 | ||