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).
The waterways of Phantom III cylinder heads, comparing two examples with different temperature differentials.
| Identifier | ExFiles\Box 93\4\ scan0054 | |
| Date | 4th August 1936 | |
| X319 E.{Mr Elliott - Chief Engineer} From Hs{Lord Ernest Hives - Chair}/Std. c. to Wor.{Arthur Wormald - General Works Manager} c. to By.{R.W. Bailey - Chief Engineer} c. to Mx.{John H Maddocks - Chief Proving Officer} c. to Mr.Walker/Pattern Shop. Hs{Lord Ernest Hives - Chair}/Std.9/MA.4.8.36. WATERWAYS ON PHANTOM III CYLINDER HEADS. Further to our report reference Hs{Lord Ernest Hives - Chair}/Std.10/KW.29.6.36 we obtained two Phantom III cylinder heads one of which, on test, gave a temperature difference between front and rear of 1º - 2ºc. while the other gave a corresponding difference of 10ºc. These have been sectioned, together with a standard Bentley head (which had been scrapped by a valve failure) the primary section being a vertical one along the centre line of the valves and the secondary one a horizontal section corresponding to section HH on drawing E.84727. The first section mentioned is the one which is most informative and gives the cross section of the waterways at a point where they are practically a minimum (see drg.E.84727). We attach photographs of this vertical section, the two Phantom III heads being on one plate, while the Bentley head is on a separate plate. The upper Phantom III head in the photograph is the head with the small temperature difference between front and rear (2ºc.) while the lower is the one with the large difference of 10ºc. It will be seen that :- (1) On the lower head the five waterways nearest the thermometer end of the head are slightly smaller than the corresponding ones on the upper head. (2) The difference is very slight. (3) The waterways on either of these heads are very much smaller than those indicated on the drawing, in fact the two waterways around the second holding down stud are omitted altogether (compare photograph of section with that of drawing of head attached, both are to same scale.) | ||