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).
Table showing the analysis of valve materials used in cars and aero engines in England.
| Identifier | ExFiles\Box 154a\1\ scan0153 | |
| Date | 12th November 1928 guessed | |
| VALVE MATERIALS IN ENGLAND The following table shows the analysis of valve materials used in cars, aero engines etc. in use in England. Some of the particulars were obtained by analysis and others from engine makers - in the latter case the name of the steel rather than the detailed analysis is given. Maker means valve supplied by engine maker and pirate means that supplied by a parts supplier. Silchrome No. 1 = .45 to .55% C. 7-9% Cr.{Mr Cra???ster / Mr Chichester} 2.5 to 3.5% Si. Si=Silicon Ni=Nickel Cr{Mr Cra???ster / Mr Chichester}=Chromium Mn=Manganese W=Tungsten. C=Carbon. | MAKE and TYPE | Si. % | CR.{Mr Cra???ster / Mr Chichester} % | Ni. % | MAKE and TYPE | Si. % | CR.{Mr Cra???ster / Mr Chichester} % | Ni. % | MAKE & TYPE | Si. % | Cr.{Mr Cra???ster / Mr Chichester} % | Ni. % | |---|---|---|---|---|---|---|---|---|---|---|---| | Leyland C Type 1927 maker, pirate | .33 .16 | 1.00 .07 | 1.48 3.36 | Humber 9/20 H.P. 1927 maker, pirate | .37 .28 | 13.35 14.0 | .31 .54 | Bristol Aircraft Engines 1927 Darwin Cobalt Chrome, 1928 Kayser Ellison 965 | C. 1.5 Cr.{Mr Cra???ster / Mr Chichester} 13.0, Co. 1-3%, Mo. .5-1% Approx. Cr.{Mr Cra???ster / Mr Chichester} 13. aNi 3.0, C. .4 W. 2.0, Si. 1.5 | | Austin 12 H.P. 1927 maker, pirate | 3.50 .12 | 8.60 .16 | .21 3.28 | Unic Taxi 12 H.P. 1923 | .22 | .07 | 4.9 | Steel seats in "Mercury" 1927 Stainless | 11 to 13 Cr.{Mr Cra???ster / Mr Chichester}, C .3 to .4 | | Bean 12 H.P. 1927 maker, pirate | .10 .27 | .14 .32 | 3.32 3.21 | Thornycroft K.B. 3 ton maker | Stainless (From marking) | | | Armstrong Sidd. Jaguar & Lynx 1927 Seats | Darwin Cobalt Chrome K.E. 365 | | Armstrong Siddeley 14 H.P. 1927 maker, pirate | .15 .12 | .18 .11 | 3.00 3.69 | Standard 14 H.P. 1927 maker | Stainless From McWilde | | | Standard 9 H.P. 1928 maker | Stainless From McWilde | | Cno 11 H.P. 1927 maker, pirate | .45 .15 | .15 .15 | 4.96 3.29 | Rolls Royce - all cars & aircraft engines. | Silchrome No.1 | | | "Tranco" pirate valves. Standard) | From Mr Tranter (1% Cr.{Mr Cra???ster / Mr Chichester} 1 1/2 % Ni. | 3% Ni. or 5% Ni.) | | Morris Oxford 1927 maker, pirate | .16 .13 | .18 .17 | 3.29 3.32 | Dennis C Type 2 1/2 tons 1927 maker, pirate | 3.03 .45 | 9.21 13.5 | .02 .54 | Note. re. British Silchrome. Some No.1 Silchrome made in England contains 2% Nickel etc. Some Silchrome in the U.K. contains less than 1% Cr.{Mr Cra???ster / Mr Chichester} & is Silchrome only in name & while better than 3% Nickel etc. is a very poor valve steel. | | Morris Cowley 1927 maker, pirate From Tegner's car after 7000 miles on Ethyl. Cast iron head | .17 .18 | .12 .49 | 3.28 5.3 | Singer 10 H.P. 1927 maker, pirate | .13 .18 | .15 .13 | 4.91 3.36 | De Havilland 4 cylinder in line Air-cooled aircraft engine (Gipsy Major) Hallford | K.E. 965 | | Austin 7 H.P. 1927 maker, pirate | 3.25 .17 | 8.64 .21 | .07 3.25 | Sunbeam 16 H.P. 6 cyl. 1927 maker | 3.29 | 7.56 | (Silchrome No.1) | Napier Lion Hadfield "Era" A.T.V. Analysis From Rich Tool Co | C .4 Mn. 1.5, Si. 1.0 Cr.{Mr Cra???ster / Mr Chichester} 14.0, Ni. 27.0, W 4.0 | | Rover 9/20 H.P. 1927 maker, pirate | .25 .14 | .21 .40 | 2.99 3.39 | Wolseley 16/25 H.P. 6 cyl. 1927 maker | .16 | .21 | 5.14 | Triumph Motor Cycle U.S. S.O. | | Citroen 12/24 H.P. 1927 maker, pirate | .05 .14 | .52 .21 | 5.40 3.29 | Rover 14/45 H.P. 1927 maker | .17 | 7.78 | .07 (Semi-stainless) | Guy Lorries etc. U.S. S.O. = Silchrome No.1 | | Fiat 12 H.P. 1927 maker, pirate | .40 .16 | .16 .29 | 5.22 3.39 | | | | | Leo-Francis Sports U.S. S.O. | | ||