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).
Heel board modification and comparing the engine compression and performance of cars 7CA and 58NA.
| Identifier | ExFiles\Box 181\M11\ img001 | |
| Date | 2nd February 1915 | |
| To Wer. for EH from R.{Sir Henry Royce} Copy to J.{Mr Johnson W.M.} " Wer. for Hy.{Tom Haldenby - Plant Engineer} " Da.{Bernard Day - Chassis Design} " Na.{Mr Nadin} R1/IB2215. February 2nd. 1915. Handwritten notes: Top: KEVILL V-?, X.508, O.K. R.Y., GREEK, 7CA, 58NA{Mr Nadin} Stamp: COPY Signature: DC/1516 By date: (Wks Mgr) With reference to the heel board on the cars, I notice that since we have used the indiarubber pedal, the feet is apt to get caught in the grooves cut in the heel board, when releasing the clutch. These grooves in the heel board had better be cancelled at once. This is a point I wrote about a week ago, but I was not quite sure in what way the heel board was wrong. Referring to 7CA, the engine on this car must have considerably higher compression than on 58NA{Mr Nadin}, and this must be the cause of 7CA being so much more lively. I feel certain that this higher compression will materially reduce the consumption, and it was noted with reference to 58NA{Mr Nadin} that it was always an extravagant car for petrol. I should be glad to know what the difference in compression is, as read by the gauge and the HP of both engines. The oil in 58NA{Mr Nadin} is also too thick. F.H.R. Handwritten note: The engine is also very free after it has warmed up. Footer: R R' 252* (12G H) (2^M 500-22-1-15) C^r 6800 | ||