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).
Out-of-balance couple caused by sleeve valves in a 12-cylinder 'Double-Six' engine.
| Identifier | ExFiles\Box 133\2\ scan0173 | |
| Date | 29th June 1935 | |
| Ha/Smth.7/KW.29.6.35. Sleeve Valves for Car Engines. Further to Ha/Smth6/KW.20.6.35. Sleeve Balance in a Double-Six Engine. The out of balance due to the sleeves in a 60°, 12 cylinder engine of SpectreCodename for Phantom III size and firing order, is a couple whose plane of action rotates through an axis parallel to the crankshaft at half crankshaft speed and in the opposite direction. The effect is to make the engine 'nose' about its c.g. The maximum value of the couple is 400 lbs.ft. at 5,000 r.p.m. (in the horizontal plane). The balance required on each of the end sleeve cranks = 2.3 lb.ins. Max. value of couple 400 lbs.ft. Min. value of couple 185 lbs.ft. Ha/Smth. | ||