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 system tests, concluding a re-designed cylinder head and more efficient radiator is required.
Identifier | ExFiles\Box 11\3\ 03-page218 | |
Date | 19th July 1930 guessed | |
-3- required, but more volume. The capacity of the water in the cylinder head is so small that the water is heated too rapidly, even when an increased flow is passing. With more volume of water passing, it is obvious that the temperature would not be so great. The tests clearly prove, and I am in agreement with Rm.{William Robotham - Chief Engineer}, that it is absolutely necessary to maintain a maximum drive of the fan, but in my opinion it is a very poor way of getting out of an inefficient cooling system, especially so when we are turning out a poorly designed engine, and I am sure that expense would be saved if the cylinder head was tackled right away, rather than trying to get the improvements which in my opinion are not satisfactory. The 60 M.P.H. tests are very good for demonstrating what the various conditions do, but they do not show or give what happens when the car is driven as cars are driven over here in France by practically every customer, and I take it will be driven the same in America during their hot season. This is the point I wish to emphasise. In conclusion, I think we have gone a step in the wrong direction by making the top tank of the radiator shallower. It appears to me that this is the most important part of the radiator, my views being taken from the results of that rain storm in No. 5 test. It was so remarkable in the way the temperature dropped, and it must have been due to the rain cooling the top tank of the radiator, as well as the matrix and as there is considerable cooling area in the top tank of the radiator, we should take the full advantage of it. To sum up the results, we require a re-designed cylinder head, a more efficient | ||