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 results and remarks for volumetric efficiency, compression pressure, and power checks under various configurations.
| Identifier | ExFiles\Box 179b\3\ img196 | |
| Date | 1st February 1933 | |
| -6- He/Ud.1/AHA.2.33 contd. Test No. Test Conditions & Results Remarks 1d. Volumetric efficiency R.P.M. curve Object - to compare with larger inlet valves, standard volumetric effcy. valve timing. Results :- 85% with small and at 2100 R.P.M. and 89.5% at large inlet valves 1600 R.P.M. (1.950" dia. and 2.050" dia) Fig.3 1e. Compression pressure - R.P.M. Comparison of curve with large inlet valves. compression Results :- 535 lbs/sq.in. at pressures with 2100 R.P.M. and 518 lbs/sq.in. small and large at 1800 R.P.M. inlet valves. Standard valve timing. Fig.4. ------------------------------------------------------------------------ New cylinder block with injector housing TESTS SERIES 2. bored to fit Bosch injector. Other conditions standard. 2a. Power check at 2000 R.P.M. normal After 10 mins. load. Results 91.2 lbs/sq.in. running power B.M.E.P. Sp.{Mr Spinney}Cons. .523 lbs/BHP/Hr. dropped off 9 lbs/sq.in. due to nozzle overheating 2b. Inlet ports fitted with short After several mins tubes 2.00" dia. 2.00" long so as power fell off to make ports similar internally and a max. pull of to C.I.1. Power at 2000 R.P.M. 93.5 lbs/sq.in. initially 97.5 lbs/sq.in. B.M.E.P. ultimately given. Sp.{Mr Spinney}Cons. .473 lbs/BHP/Hr. Initial power figure, allowing for motoring losses equals C.I.1. 2c. 30 mins. test with readings of Tests 2c - 2h power & consumption at 5 mins. conducted to intervals. Normal load 2000 RPM. investigate cause Used Bosch nozzle. Mean B.M.E.P. of loss of power 92.5 lbs/sq.in. with time. Figs. 5 & 6. Power fairly steady. 2d. ditto, used R.R.-Bosch nozzle Power fairly stea- Mean B.M.E.P. 89 lbs/sq.in. dy.{F R Danby} Test ended after 20 mins. due to crack developing in fuel line. | ||