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).
Letter to Mr. Royce regarding a proposal to increase the standard engine compression volume.
| Identifier | ExFiles\Box 19\7\ Scan006 | |
| Date | 21th September 1910 | |
| B1/B21910. 21st September 1910. Mr. Royce, Re Compression Volumes of Standard Engines. Mr. Platford is very anxious that we should increase our standard compression volume from 24 1/2 cu. ins. to 25 3/4 cu. ins. He tells me that the engines are too harsh to pass test, and that to every engine he is now fitting 80 thou. liners, and also machining the tops of the stud bosses to suit. The figure for the compression volume of 24 1/2 cu. ins. was arrived at, originally, after due consideration by Mr. Platford, but he suggests that there is the possibility of an error in his measurements in consequence of an air lock in the cylinder head (the compression volumes are measured in the shops with the cylinders upside down, to preclude this error), but it is possible that we are getting more power now than when his measurements were taken. Mr. Wormald would like this matter decided immediately, so will you kindly telegraph whether I shall issue the necessary instructions. B.B. Barrington [Handwritten note in the left margin] X790 [Handwritten note at the bottom] Yes 25 1/2 +/- 1/4 Chief cause is increase of Volumn Taken per stroke especially at higher speed. I hope the power will still be about +45 on Road wheels FHR | ||