Technical note and drawing detailing a standard piston split on the pressure side to reduce engine knock.
| Identifier | ExFiles\Box 48\1\ Scan108 | |
| Date | 30th September 1919 | |
| -2- Standard Pistons Split on the pressure side. This is a standard piston on which we have sawn in the manner shewn below:- The idea of this piston is to make a piston which will enable us to run with less clearance. We do not expect that this piston will cure the knocks when the engine is cold but we are sure that being able to run with less clearance will tremendously reduce knocks when cold and will positively overcome them when the piston is hot. The position as regards pistons with the cars on test is now very nearly the same as the position was with the cast iron pistons previous to the war. In order to make the cars reasonable as regards knocks, when they are on the verge of seizing up when run on the dynamometer. We feel that in the endeavour Contd. | ||
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).