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).
Comparison table of crankshaft details and balance weights for various engines.
| Identifier | ExFiles\Box 179\3\ img064 | |
| Date | 1st August 1935 | |
| CRANKSHAFT DETAILS IN EVERY CASE WITH BALANCE WEIGHTS P.I 403/1.8.35 Engine J.3 PEREGRINE ALFA ROMEO CHINA P.I Bore and Stroke 3.4 x 5.0 2.725 x 4.125 65 x 85 3.25 x 4.5 4.25 x 5.5 Ratio Stroke / Bore 1.47 1.46 1.35 1.38 1.29 Inertia of Crankshaft - LBS IN² 3.0 6 14.5 6.0 45.0 Inertia of Big Ends & Pistons - LBS IN² 3.03 25.8 10 20 Inertia of Spring Hub or Supercharger - LBS IN² 12.4 Speed of Master Period R.P.M. With Hub or Supercharger 4550 3750 7200 4200 4200 With No Damper Hub Crankshaft Stiffness - LBS FT / RADIAN E 61,500 E 57,250 52,000 E 100,045 62,000 4300 E 37,401 39,000 E 82,574 Journal Dia 2.500 2.000 1.938 2.125 2.800 Crankpin Dia 2.125 1.750 1.683 2.000 2.375 | ||