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).
Cylinder bore wear and ovality measurements for a Bentley engine, chassis B.II8.CR.
| Identifier | ExFiles\Box 146\5\ scan0078 | |
| Date | 6th December 1938 | |
| 1245 Levallois, Sr/VA.I/HB.{C. E. Harcombe}6.12.38 To Bentley Motors Ltd. Derby............Rm.{William Robotham - Chief Engineer} re: CYLINDER BORE WEAR ON BENTLEY ENGINES Chassis B.II8.CR{Mr Cra???ster / Mr Chichester} - Mr STRAUSS Total mileage: 35657 miles Please find below figures in connection with wear and ovality of the cylinder bores of above car. The owner informed us that since we fitted a large capacity oil pump, the oil consumption has been very heavy, approx.: 1 litre per 100 kilometers. The car has been sent to us for general repairs including the overhauling of the engine and the boring of the cylinders and fitting oversize pistons. The owner is naturally paying for all of the repairs. The measurements have been taken in 4 places, i.e.: [Signature: Rm{William Robotham - Chief Engineer}] 1°- Centre of bore 2°- 2 1/2" below lip 3°- 1 1/4" " " 4°- Just below lip Note: Dimensions "A" taken at right angles to crankshaft " " "B" " parallel to crankshaft. ----------------------------------------------------------------------------------------- Cylinder : Centre of bore : 2 1/2" below : 1 1/4" below : Just below : : lip : lip : lip ----------------------------------------------------------------------------------------- : A.{Mr Adams}: 3" 252 : 3" 251 : 3" 251 : 3" 260 5 I : B.: 3" 256 : 3" 254 5 : 3" 253 : 3" 263 5 ----------------------------------------------------------------------------------------- : A.{Mr Adams}: 3" 252 5 : 3" 251 : 3" 251 : 3" 258 2 : B.: 3" 256 : 3" 254 : 3" 253 25 : 3" 263 75 ----------------------------------------------------------------------------------------- : A.{Mr Adams}: 3" 253 5 : 3" 251 5 : 3" 251 75 : 3" 262 3 : B.: 3" 256 25 : 3" 255 : 3" 253 5 : 3" 266 ----------------------------------------------------------------------------------------- : A.{Mr Adams}: 3" 253 : 3" 251 25 : 3" 251 25 : 3" 259 4 : B.: 3" 256 : 3" 255 : 3" 252 5 : ::3" 260 ----------------------------------------------------------------------------------------- : A.{Mr Adams}: 3" 252 5 : 3" 250 75 : 3" 250 75 : 3" 259 5 : B.: 3" 254 75 : 3" 253 5 : 3" 252 : 3" 260 5 ----------------------------------------------------------------------------------------- : A.{Mr Adams}: 3" 256 : 3" 251 5 : 3" 251 75 : 3" 258 6 : B.: 3" 255 75 : 3" 253 5 : 3" 251 75 : 3" 260 75 ----------------------------------------------------------------------------------------- Sr/VA.Vd | ||