Test report logging running time, mileage, and backlash measurements for nine different component units.
| Identifier | ExFiles\Box 7\8\ X 607 Camshaft-page30 | |
| Date | 12th April 1938 guessed | |
| UNIT NO. RUNNING TIME HOURS ON TEST BED. MILES ON CHASSIS. WITH OR WITHOUT BALANCING CAM. MOULDED OR SHEET FABROIL. HELIX ANGLE. APPROX. ORIGINAL BACKLASH. APPROX. FINAL BACKLASH. 1. 150 hrs. at 1000 rpm. 7,900 miles in France (20.G.VI) | With | Sheet | 32° | 0.0 | 0.009 2. 190 hrs. with 68 hrs. between 4000-4500 r.p.m. 1,700 miles (24.G.VI) | 30 hrs. without | Sheet | 32° | 0.0 | 0.007-0.015 3. 11,000 miles (24.G.VI) | With | Sheet | 32° | 0.0 | 0.004 4. 6,320 miles (27.G.VI) | With | Sheet | 32° | 0.0 | 0.003 5. 7,040 miles including prolonged high speeds to break distributors (28.G.VI) | With | Sheet | 41° | 0.0 | 0.008 6. 192 hrs. general development not above 4000 r.p.m. 2,000 miles (27.G.VI) | 40 hrs. without | Sheet | 41° | 0.0 | 0.003 7. 21,000 miles (26.G.VI) | without | Moulded | 41° | 0.0 | 0.012-0.025 8. Negligible running (25.G.VI) | Without | Moulded | 41° | 0.002 | Now in Sg {Arthur F. Sidgreaves - MD} 's car. 9. 3,300 miles (29.G.VI) | Without | Moulded | 41° | 0.0 | 0.002 | ||
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).