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).
Power comparison chart for modified Aerolite pistons and various honed bore dimensions.
| Identifier | ExFiles\Box 86\2\ scan0223 | |
| Date | 4th June 1934 | |
| B7 Unit. x236 Aerolite Pistons modified Grinding A.{Mr Adams} | R.P.M. | ORIGINAL POWER | POWER WITH BORES HONED +.0005 | POWER WITH BORES HONED +.001 | |---|---|---|---| | | BHP | BMEP | BHP | BMEP | BHP | B.M.E.P | | 750 | 22.4 | 106.3 | | | 22.7 | 107.1 | | 1000 | 31.1 | 110.0 | | | 31.4 | 111.0 | | 1500 | 48.1 | 113.5 | | | 48.7 | 114.9 | | 2000 | 64.7 | 114.7 | | | 66.0 | 117.0 | | 2500 | 80.9 | 114.7 | | | 82.8 | 116.7 | | 3000 | 94.0 | 110.9 | | | 96.2 | 113.5 | | 3500 | 104.1 | 104.3 | | | 106.8 | 108.0 | | 4000 | 107.6 | 95.0 | 110.3 | 97.7 | 112.8 | 99.7 | | 4250 | 105.8 | 88.2 | 108.1 | 90.0 | 109.4 | 91.1 | | 4500 | 100.1 | 78.9 | 102.7 | 80.9 | 104.4 | 82.2 | PISTON AND BORE DIMENSIONS AS SHOWN ON CHART 3. 4/6/34 FOR FIGURES A | ||