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).
Compression, valve timing, and ignition data for a 'Packard' car.
| Identifier | ExFiles\Box 127\1\ scan0072 | |
| Date | 21th February 1920 | |
| X435 21.2.20. "PACKARD" CAR - COMPRESSIONS. No.1 Cylinder - Off side. Engine revs. Compression. 2500 75 lbs. 2000 86 " 1500 95 " 1000 82 " 750 91 " 500 93 " checked on mixture control No.3 Cylinder - Near side. 2500 75 lbs. 2000 85 " 1500 91 " 1000 87 " 750 91 " 500 96 " C.C 9° Valve Timing. I.O 9° P.T.D.C. I.C 37° P.B.D.C. E.O 42° B.B.D.C. E.C 4° P.T.D.C. Ignition. Advance 25° B.T.D.C. Retard 4° P.T.D.C. Contd. - | ||