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 dismantling and analysis of a Marmon car crankshaft and bearings.
| Identifier | ExFiles\Box 180\M1\7\ img002 | |
| Date | 1st September 1921 | |
| To R.{Sir Henry Royce} from Hs.{Lord Ernest Hives - Chair} c. to CJ. c. to R.{Sir Henry Royce} c. to Du. c. to BY.{R.W. Bailey - Chief Engineer} For EWT. from RR Inc. ORIGINAL Hal/LGS.9.21. MARMON CAR. x1692 When we dismantled the Marmon car in order that a drawing should be made of the Crankshaft, we were struck with the entire absence of wear on the Crankshaft and also by the excellent appearance of the bearings. As it was only a three-bearing crankshaft and as the engine is a high efficiency engine, we were rather surprised at the results. Below are the particulars of this crankshaft and the analysis of the steel. The crankshaft we believe, is better as regards absence of wear than we get on our own engine after the same mileage (8000 miles). We have examined the filtering system for the oil to see whether there are any special features about it. The only point we notice is that there is a large settling tank for the oil. Particulars. Front journal bearing. 2.747" dia. .00025" out of round. Centre journal bearing 2.747" dia. .00025" out of round. .005" taper. Rear journal bearing. 2.747" dia. .00025" out of round. .0005" taper. contd: | ||