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 cooling circulation issues, radiator choking, and potential solutions.
| Identifier | ExFiles\Box 15\1\ Scan197 | |
| Date | 10th January 1930 | |
| -4- Hs{Lord Ernest Hives - Chair}/Rm{William Robotham - Chief Engineer}3/MJ10.1.30 contd. standard (Graph 4 and 1 Hs{Lord Ernest Hives - Chair}/AJL1.9.1.30). These show that the circulation cannot be reduced very much. They also show than any such restriction must not be put on the far side of a rubber connection as the back pressure built up is over 20 lbs/sq.in. at high engine speeds (Graph 2. Hs{Lord Ernest Hives - Chair}/AJL1.9.1.30). we A phenomenon was observed on Mr.Short's car, an F2B. series with choked radiator, was that water was thrown out of the steam pipes when the engine was "reved" up even with the water cold. His radiator was a particularly bad case of choking up, but we have been able to reproduce the same trouble by artificially obstructing the top row of tubes on one of our own cars. Apparently the pump is able to create a partial vacuum in the centre of the radiator and push the excess of water so obtained into the top tank where there is no room for it. A reduction in pump delivery reduces this trouble slightly, but is not of much interest as for the trouble to occur at all the radiator must be in a hopeless condition. In order to avoid loss of water by expansion (which is very rapid above 90°C.) and incipient boiling, we have brought the red lamp in at 92 1/2°C. We could with advantage have slightly more top tank capacity to deal with this now that we carry more water owing to the larger spaces between the tubes. The Chrysler evidently attach more importance to top tank capacity as they have an extension | ||