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).
Engine compression test results for various cars.
| Identifier | ExFiles\Box 19\7\ Scan004 | |
| Date | 24th August 1908 | |
| Engine Compressions X790 4400 Taken on 60592 - 1907 long. Compressions with gauge on non stop. above atmosphere. 60 lbs. Have tested with oil. 13 1/2 oz. Pres B 1 pint = 18 g.{Mr Griffiths - Chief Accountant / Mr Gnapp} .. = 26 cu ins. similar test on Silver Ghost. - ~~59~~ 60 to 61 lbs above atmos 17/8/08. and increased 1/4" cylinders lowered. tested 75 to 80 - Trials car 726 - compression. 75 to 80 (with hood) 24/8/08. J.J. Car 26350B. No.1 cylinder 85 lbs. | ||