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).
Comparative table of engine specifications (B.HP and Compression Ratio) for various car models from 1927 to 1929.
| Identifier | ExFiles\Box 19\7\ Scan148 | |
| Date | 9th September 1932 guessed | |
| -2- Make & Model 1927 1928 1929 B.H.P. Comp.Ratio B.H.P. Comp.Ratio B.H.P. Comp.Ratio Stand Op. Stand Op. Stand Op. Essex. 6 4000 5.20 55.3600 5.80 Falcon. 46-3000 4.6 45-3000 5.50 Ford. A 20-1600 3.6 40-2200 4.50 40-2200 4.22 Franklin 130 4.57 Franklin 135,137 4.43 46-2500 4.40 48-2500 4.57 Gardner 120 52-2500 4.5 65-3200 5.0 76-3200 5.05 Gardner 125 62-3200 5.0 74-3200 5.0 86-3000 5.05 Gardner 130 84-2900 5.0 115.3200 5.35 115.3300 5.25 Gra.Paige 612 62-3200 5.57 Gra.Paige 615 76-3200 5.51 Gra.Paige 621 97-3200 5.35 Gra.Paige 827 120-3200 5.54 Gra.Paige 837 120-3200 5.54 Hudson 95-3100 5.25 91-3200 6.00 Hupmobile A 5.00 4.8 Hupmobile M 5.05 Jordan 6 RE 62-3000 62-3000 5.00 61-3000 5.05 Jordan 8 JE 64-3000 4.65 80-3200 5.00 85-3200 5.05 Kissel 73 52-2900 5.15 Kissel 95 95-3200 5.35 Kissel 126 126-3400 5.35 La{L. A. Archer} Salle 80-3000 4.80 86-3000 5.3 4.80 Lincoln 90-2800 4.81 90-2800 4.81 90-2800 4.81 Locomobile 78 Locomobile 88 90-3000 5.00 102-3000 5.3 Marmon. 68 64-3200 5.2 5.25 76-3200 5.25 Marmon 78 84-2700 4.34 86-3400 5.50 86-3400 5.50 Moon 6-72 47-2600 4.78 66-3150 4.94 66-3150 4.94 Moon 8-80 85-3100 5.00 85-3100 5.00 Nash Std.6 40-2400 4.50 45-2600 4.50 50-2800 5.00 Nash Spc.6 52-2600 4.69 52-2600 4.69 65-2900 5.15 Nash Adv.6 69-2500 4.60 70-2400 4.60 78-2900 5.10 | ||