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).
Chassis after a 7,000-mile test in France, detailing engine condition.
| Identifier | WestWitteringFiles\N\July1925-September1925\ Scan209 | |
| Date | 1st September 1925 | |
| R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF: GWH{George W. Hancock - Head Chateauroux}/Crnl.9.25. Hotel de France, Chateauroux, Indre, France. To Hs.{Lord Ernest Hives - Chair} from G.W.Hancock ******************* REPORT ON CHASSIS 9-G-111 - OPEN TOURING CAR AFTER 7,000 MILES TEST IN FRANCE. ENGINE. Power: Still good. Compressions Nos. 1,3,5,and 6 cyls. are good and even. Nos. 2, and 4 are fair. Compression blows passed pistons. Engine detonates and thuds on pick up. Lubrication of cylinders. Examination of cylinders shews that Nos. 1,3,5, and 6 are over-oiling. Nos. 2, and 4 are on dry side, but do not shew any signs of seizing. Condition of cyl: walls. Nos. 1,2,3,4 and 6 are in good condition. No.5. still shews light marks down one side of walls. Valves & Fittings. We have had on one occasion, at approx. 5250 miles. Nos. 2,4, and 5 exhaust valves all clearance taken up between tappet and valve. These had apparently stretched during the run. Clearances were readjusted, and they have remained at this setting for the rest of run. All rocker arms are well lubricated. Pistons. Pistons E.53563 with shrunk gudgeon pins and end piece to E.5356/1/2, and to Lec.2009. Bottom scraper ring made 'L' shape. Nos. 1,3,5 and 6 shew heavy carbon deposit, and heads covered with oil. Nos. 2 and 4 shew heavy carbon deposit, but are dry. On picking up on top gear, there are slight piston knocks. We have not heard, or noticed, any gudgeon pin knocks. Periods. We consider that the engine is very good for periods. There is a slight one at 10 to 12 m.p.h. contd :- | ||