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).
The performance and engine characteristics of a Cadillac or LaSalle vehicle.
| Identifier | ExFiles\Box 127\2\ scan0006 | |
| Date | 27th August 1929 guessed | |
| -2- a fair turn of speed, approximately 70 m.p.h., in spite of its low top gear. It is an altogether better proposition than the Cadillac or La{L. A. Archer} Salle. The engine is much less woolly and the power appears to be well maintained up to about 3,000 revs. The speedometer appeared to be 10% fast. Under these circumstances one would presume that they have developed the power unit to a reasonable extent. ENGINE. We examined a stripped engine. The workmanship was good. The crankshaft is 32.5" overall length. The pins and journals are both 2" dia. The pin bearings are 2.5" long. The connecting rods have 12.5" centres. There is a crankshaft damper of the normal type at the front end of the shaft. We understand that this has only been fitted during the past eighteen months to cure a period at 47 m.p.h. The engine is 60° and not 90° like the La{L. A. Archer} Salle. The firing is therefore irregular. The reason given is to prevent synchronous torsional vibration occurring. The crankshaft damper proves that this is not an altogether acceptable theory. The crankcase is deep in section and of aluminium. Cylinder blocks cast iron, detachable heads Ricardo type. Pistons appeared to be exceptionally light, aluminium split skirt with three perfect circle rings at the top. Timing by chain at the front end. Carburetter in the Vee, exhaust pipes also in the Vee leading back under driver's feet with consequent unpleasantly hot floorboards. The compression pressure of the engine is given | ||