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).
Blueprint for an exhaust valve seat.
| Identifier | ExFiles\Box 86\1\ scan0034 | |
| Date | 7th November 1933 | |
| V 1653. CYL. HEAD DIMN. MACHINE TO GIVE 'O1O DIMN CLEARANCE VALVE SEAT. (EXHAUST) N.M.C. BENTLEY. 6.OFF ROLLS-ROYCE, LTD PRINT ROOM 7 NOV 1933 DERBY. TURN. 1.492 / 1.500 DIA. SCREW. 1.500 20 T.P.I. R.H. 1.375 DIA. +.5 - 1.300 DIA. 1.425 DIA. +.2 -.5 1.645 DIA. .450 +0 -.10 .250 .140 +.15 - 45° 30° 640 / b.h.p. | ||