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).
Engine tests detailing fuel injection, a comparison of nozzles, oil leaks, and piston slap issues.
| Identifier | WestWitteringFiles\U\January1930-April1930\ Scan119 | |
| Date | 24th March 1932 | |
| -2- HS{Lord Ernest Hives - Chair}/CIP.1/H.24.3.32.Contd. commencement of the injection varies slightly when the pump control is in the positions for small injections, but it remains steady when the pump is delivering the larger quantities of fuel. The above tests were carried out with the nozzle valve set to lift at approximately 2200 lbs/sq.in. The quantities of fuel injected for various positions of the control have not yet been ascertained, but will form the subject of a future test. A comparison of six "Bosch" injection nozzles and one of R.R. manufacture has been made and indicator diagrams taken; under similar conditions of R.P.M., maximum cylinder pressure and fuel consumption. The more important figures have been tabulated. (SEE ATTACHED CHART). A compression pressure diagram has also been taken which shews that a maximum compression pressure of 380 lbs/sq.in. is obtained when the engine is motored over at 380 R.P.M. with the jacket water temperature at 80°C. We are experiencing a fairly bad oil leak from the front side of the flywheel, although the leakage has been reduced by drilling more drain holes from the oil-thrower groove. It may also be reduced by removing the valve from the crankcase breather. We are also troubled with oil leakage at the rev.-counter drive and at the vertical drive to the camshafts. The oil pressure stands 55 - 60 lbs/sq.in. (at 1500 R.P.M.). We are experiencing very bad piston slap at all speeds and loads, and it is suggested that the clearances, (namely .045" at crown and .030" at skirt) are unnecessarily large). | ||