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).
Report from Chateauroux, France, on an investigation into crankcase oil flow, engine mounting stability, and damper performance.
| Identifier | ExFiles\Box 1\4\ B001_X 100a-page189 | |
| Date | 31th January 1933 | |
| Handwritten: No E B Seen 2/2/33 JN. By male By 3. PER.II. Please return X.4057. Stamp: RECEIVED FEB 1 1933 Printed Letterhead: H O T E L. D E.{Mr Elliott - Chief Engineer} F R A N C E.{Mr Elliott - Chief Engineer} CHATEAUROUX? INDRE. FRANCE 31. 1. 33. To Hs.{Lord Ernest Hives - Chair} The Men arrived here to day. Re the Car. We have been busy investigating the flow of oil from the release to the sump. We find that we can maintain the level of oil in the crankcase by letting the release oil go direct into the base through a .375 hole. This still keeps a plentifull supply to the camshaft. It overcomes the fluctuation of the pressure that we were having when decelerating (not braking) We have observed the results on the road and the height of oil in the ignition tower (governor case) never fell below the top of the govenor case. The bottom half showed allmost full the whole time when keeping the speed steady up to 70 M.P.H. We noticed however that as soon as we closed the throttle choose what the speed was! the deceleration was sufficient to cause the oil to go forward and leave the rear com partment practically empty. This was observed by the action of the guage. We shall therefore carry out the request of E/JNR.{Charles L. Jenner} and reduce the hole in the rear partition from .625 to .500. We are of the opinion that the front of the Car is not so steady with the present front engine mounting. the scheme as fitted to 2 PER.II. which we ran was perfectly steady on the front. We also find that the front torque reaction dampers are necessary with this scheme to smooth out the engine at higher speeds with the soft rubbers fitted. The hard rubbers produced a pronounced torque reaction effect without any damping. Re the fouling of the propeller damper . This would not be the result of frame deflection; It was caused by the deflection of the rear springs in conjunction with a heel over effect. G.W.H. [Signature of G.W.H. Hancock] | ||