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).
Comparison of running conditions for engines X-F-12 and X-F-14, detailing differences in pistons, rings, and tappet clearances.
| Identifier | ExFiles\Box 36\2\ scan 106 | |
| Date | 14th March 1927 guessed | |
| contd :- -2- removing the air intake castings E.29697 and E.29204 (compare with B.) The effect on the induction pipe depression is also illustrated by the curve C. as compared with the normal conditions a.{Mr Adams} and b. which existed when curves A.{Mr Adams} and B. were taken. Differences which we know to exist between X-F-12 and X-F-14 running conditions are as follows :- X-F-12. X-F-14 (or X-F-18) (1) Slack pistons and rings. New pistons and strong rings. (2) Tappet clearances :- Tappet clearances :- Inlet .010". Exhaust .020". Inlet .020". Exhaust .020" The possibility of either of these having any effect upon the power output is being investigated. Hs{Lord Ernest Hives - Chair}/V.Halliwell. | ||