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).
Specifications and analysis of a Ford V-8 Engine, including details on balance and critical speed.
| Identifier | ExFiles\Box 126\3\ scan0014 | |
| Date | 27th September 1935 | |
| To Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} X1104 Hs{Lord Ernest Hives - Chair}/Smth.5/KW. 27.9.35. Ford V-8 Engine. Bore 3.063 Stroke 3.750 Stroke/Bore Ratio 1.22 Capacity 221 cu.ins. 3,620 c.c. Length of Cyl.Block 19" approx. Overall width of Engine 21" approx. Crankshaft Arrangement [Diagram of a V-8 crankshaft] Firing Order 1-5-4-8-6-3-7-2 Balance. With this crank arrangement the secondary forces and couples balance, but the unsymmetrical firing order is likely to give distribution troubles. Critical Speed. As with a straight 8 engine, there is no critical speed below the 4th order, which in the Ford should occur at about 4600 r.p.m. At this speed the amplitude of the forcing inertia torque for one cylinder is about 1/10th of that for the major torsional period on a Bentley, so there should be no difficulty in damping out the period. Hs{Lord Ernest Hives - Chair}/F.Ll.Smith. | ||