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 report on re-designed 12½% stiffer front springs for a 9-PK car, listing faults and remedies over 10,458 miles.
| Identifier | ExFiles\Box 73\3\ scan0268 | |
| Date | 31th December 1924 guessed | |
| SHEET 14. TEST NO. Xlll. FIRTHS RE-DESIGNED 12½% STIFFER FRONT SPRINGS - 9-PK CAR. TROUBLES. | MILEAGE. | CAUSE OR REMEDY. Main cyl. extra oil pipe broken. | 1259 | Electrical system failed. | 2361 | Short circuit in switch box - broken wire. Water in petrol system. | 2611 | Purchased petrol contained water. A.T. speedometer mileage recorder not functioning. | 27321 | Several teeth stripped off driving pinion of mileage recorder. N.S. rear brake rope nearly frayed through where it passes through spring support bracket. | 6540 | New brake rope made and fitted. Inside support bracket for O.S. rear spring king-pin broken. | 7383 | No.5 big end bearing run. | 9911 | No. 5 piston taken out and test finished on 5 cyls. Windscreen broken. Front wing stay broken (twice) Front wings continually splitting. | | MILEAGE OF TEST - 10,458 - AVERAGE SPEED 34.23 m.p.h. At the end of this test the brakes on this car had completed 31,080 miles. The work done on them being only - one new rear brake rope fitted and rear brakes re-lined once. Front brake toggle actuating shafts were very loose in their bearings. Also both leading shoe toggle pins were very loose in the brake shoes - the hole in the brake shoes having enlarged considerably. Hs{Lord Ernest Hives - Chair}/AJL. | ||