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 test conditions and results for fuel nozzle performance and cylinder head modifications.
| Identifier | ExFiles\Box 179b\3\ img199 | |
| Date | 1st February 1933 | |
| -9- Test No. Test Conditions & Results 3e. R.R-Bosch nozzle used in Test 3d. 10% petrol - 90% Airship Diesel oil as fuel. Power about 92.5 lbs/sq.in. B.M.E.P. Sp.{Mr Spinney}cons. about .500 lbs/BHP/Hr. Remarks. Object to determine whether adding volatile constituent to fuel affects power drop. Fig.13. TEST SERIES 4. The cylinder head was modified as shown in Fig.14 so that a separate water supply could be connected to the fuel valve jacket. This was done as it was thought that the gain in power and stability of running effected by the introduction of the copper tube, might be further increased by improving the cooling of the injector still more. A copper-constantan thermo couple was attached to the fuel injector body 2.600 ins. from the nozzle. Greater clearance round nozzle. Test No. Test Conditions and Results. 4a. 2 hr. test. Bosch nozzle. 1st. hr. No water supply to injector pocket. B.M.E.P. 92.5 lbs/sq.in. Sp.{Mr Spinney}Cons. .490 lbs/BHP/Hr. Injector temp. 76°C. 2nd. hr. Max. water supply to injector. B.M.E.P. 91 lbs/sq." Sp.{Mr Spinney}Cons. .500 lbs/BHP/Hr. Injector temp. 63°C. Airship Diesel oil. Remarks. Object to investigate injector temperature on power and consumption. Fig.15. 4b. Fuel-line diagrams taken at injector end of line. 2000 R.P.M. Injection pressure setting 1500 lbs/sq.in. with Bosch unloading delivery valve in pump. B.M.E.P. 81.7 Sp.{Mr Spinney}Cons. .574 lbs. With ball valve B.M.E.P. 81.7 Sp.{Mr Spinney}Cons. .574 lbs. Injection pressure setting 3000 lbs/sq.in. with ball valve B.M.E.P. 88.3 Sp.{Mr Spinney}Cons. .522 lbs. With unloading valve B.M.E.P. 90.8 Sp.{Mr Spinney}Cons. .510 lbs. Remarks. It was thought that discolouration of needle valve might be due to air getting into injector through valve bounce. If this were so effect should be increased by (a) substituting ball valve for unloading valve in pump and (b) reduction in static setting. No appreciable change noted. Poor performance due to leakage at indicator valve. Figs. 16, 17, 18 & 19. | ||