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 performance issues related to the carburetter, throttle, and radiator cooling system.
| Identifier | ExFiles\Box 11\3\ 03-page196 | |
| Date | 14th July 1930 guessed | |
| -4- sufficient heat on the carburetter. We cannot run here decently until the water temperature is between 75 & 80°C., and it makes practically no difference however strong you make the mixture. We had considerable trouble, when the car was first brought out, with the throttle not being sensitive to the control lever. We have definitely cured this by making the pull off spring slightly more in tension. What we actually did was to shorten the wire link .250". We should recommend that this be adopted, as there is very little tension on the throttle in the closed position with the standard arrangement. We have taken tests in the garage to prove whether the thermostat is the cause of losing water from the radiator. The difference with the thermostat out and in is not more than 5%. The thermostat does slightly throw the water upwards. We have come across what probably has been a big cause of the water being turned out, that is a lump of solder 2 1/2" long and 1 1/2" broad at its maximum, which was lying flat upon the top of the tubes. Having fished this out, we are losing practically no water. We notice that each time the engine is shut down, there is a good quantity of air bubbles escaping from the outlet pipe. The level of the water drops quite 3/4" in height, which means that there must be quite a quantity of air in the system whilst the engine is running. We also notice that the speed and swell of the water in the top tank cause it to be one mass of air balls. The design of the top inlet into the radiator is wrong. There are two holes approx. 1" dia. in the tube, and the water, instead of being flung | ||