Car testing at Brooklands, detailing performance times and engine component failures due to oil shortage.
| Identifier | ExFiles\Box 155\1\ scan0076 | |
| Date | 27th April 1933 | |
| x788 To Rn. {Mr Robinson} from Hs {Lord Ernest Hives - Chair} /Wynn. C. E. {Mr Elliott - Chief Engineer} Ltd. Hs {Lord Ernest Hives - Chair} /Wynn. 9/KT. 27.4.33. RE. VISIT TO BROOKLANDS WITH 1.J.III. The above car was taken down to Brooklands track yesterday for a series of tests, but unfortunately we were only able to do a few runs because the track was being used for motor cycle races. The following times were obtained with ignition set at 20° B.T.D.C. fully advanced. Cut Out Closed. 75.92 m.p.h. Lap Speed. Cut Out Open. 78.06 m.p.h. " " " 78.26 m.p.h. Half Mile. Ignition set at 25° B.T.D.C. fully advanced:- Cut Out Open. 78.06 M.P.H. Lap Speed. " " 78.80 " Half Mile. Oil Temperature during these runs. 100°C (Thermometer needle hard on dial stop past 100°C). Water " " 95°C. Oil Temperature on road. 85°C. Water " " 75-80°C. Oil Consumption. 650 M.P.G. Petrol Cons. 11.4 M.P.G. Nos. 11 & 12 tappets became very noisy after our last lap run, and on investigation we found that both of them were short of oil, in fact although Nos. 7, 8, & 9, rockers had ample oil, No.10 not quite so much, but sufficient, Nos. 11 & 12 were receiving no oil at all, the result being of course, the small plungers were hammered by the eccentric rockers on to the plunger return springs, until these were broken. After the springs had broken, the plungers hammered direct on to the base of the plunger housings until these were broken. We found that the front rocker shaft suffered in a similar manner for oil shortage on Nos 1 & 2 rockers, | ||
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).