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).
Test results for engine rattles on an extra strong crankshaft type.
| Identifier | ExFiles\Box 25\3\ Scan016 | |
| Date | 13th June 1911 | |
| c R.R. 149 (W 414. 13.4.11) G 1616. X634 4100 Engine rattles - Crankshaft periods. Extra strong type Tested on special strong crank shaft. 2 1/2" pins + thick webs. (not specially lightened). Slitter drive taken off. a Chassis 1413. on road & Syn. E,C,P & Kevin Engine speed, m.p.h. in 3rd 720 (about) 23-24 hardly perceptable. 1000 (about) 34 ditto. 1335 43-44 Quite noticeable 1970 65 Pronounced (Worst) Correct record as tested) Generally not as bad as washer crank shafts. are less defined with standard slitter drive. No low speed E.S. rattles, thuds, E.S. knocks etc. EP{G. Eric Platford - Chief Quality Engineer} 13/6/11 | ||