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 report detailing standard conditions and results from a series of performance tests.
| Identifier | ExFiles\Box 179b\3\ img195 | |
| Date | 4th February 1933 | |
| -5- Standard Conditions. Pointed top piston Sx.5205. Compression ratio 14.0 : 1 Standard "Buzzard" inlet (1.950" dia.) and exhaust valves. High lift inlet cams to V.1150 (Lift 0.600") Low lift exhaust cam (0.475" lift) Valve Timing with .020" clearance I.O. 7° late E.C. 30° early I.C. 24° " E.O. 10° late Maximum cyl. pressure 1000 lbs/sq.in. Standard Bosch fuel pump Fz/1B. 10 mm. plunger. Bosch injector (Nozzle 8 holes, .010" dia., .025" long 140° included angle). Injection valve static setting. Normal "Anglo Persian" Airship Diesel oil. Normal injection quantity .235 ccs/cycle. Development speed 2000 R.P.M. Normal outlet jacket water temperature 80°C. Normal oil temperature 60° - 65°C. SCHEDULE OF TESTS. Tests Series 1. Sleeve removed and bush screwed in injector pocket as shown in Fig.1. Injector externally water cooled. Standard conditions except where stated. Test No. Test Conditions & Results. Remarks. a.{Mr Adams} Compression ratio reduced to 12.0 Test with reduced Power check 2000 R.P.M. comp. ratio prior 83.2 lbs/sq.in. B.M.E.P. to supercharging Sp.{Mr Spinney}cons. .572 lbs/BHP/Hr. tests. b. Supercharged consumption loops Best result at at 2000 R.P.M. and 3, 8 and 10.1 8 lbs/sq.in. boost lbs/sq.in. boost. C.R. 12.0 : 1 All tests adverse- Results in Fig.2. ly affected by overheating of fuel valve. k.{Mr Kilner} Test naturally aspirated with Test to determine larger inlet valves (2.050" dia.) effect of larger C.R. 14.0. inlet valves on 79.5 lbs/sq.in. B.M.E.P. power. Power Spcons. .565 lbs/BHP/Hr. unstable due to fuel valve over- heating. | ||