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).
Article from 'Automotive Industries' about the new model Lexington car and its Ansted engine.
| Identifier | ExFiles\Box 50\3\ Scan049 | |
| Date | 6th January 1921 | |
| 4 AUTOMOTIVE INDUSTRIES THE AUTOMOBILE January 6, 1921 New Model Lexington Car Uses Ansted Engine Model T chassis similar to model S except for new engine. Latter is high speed type with overhead valves, novel rocking valve gear, and vacuum oil control. Large well heated inlet manifold cast integral with exhaust header. Hand brake is mounted on transmission. Makers set good precedent by furnishing more detailed specifications than are customary. By J. {Mr Johnson W.M.} Edward Schipper A NEW make of engine, the Ansted, features the new model of Lexington car. Otherwise, the new chassis is very similar to the model S (which will be continued), though the wheelbase has been considerably lengthened. For the present the new chassis will be fitted with seven-passenger and closed bodies only. The Ansted engine is a valve-in-head type and is designed for operation at high rotative speeds, hence it is capable of giving considerably more power than the L head engine formerly used, though it is of the same piston displacement. Its maximum output of 73 hp. is obtained at 3200 r.p.m. It is of 224 cu. in. displacement and the maximum brake horsepower per cubic inch of displacement is 0.325. The cylinder barrels and upper half of the crankcase are in one casting, which makes a good manufacturing job. All finished surfaces of the block are at right angles or parallel to the bottom face of the cylinders. The water jackets are carried the entire length of the cylinder wall, and there are water spaces between adjacent cylinder barrels. The pressed steel underpan acts as an oil reservoir. The timing gear cover plate is so fashioned as to provide a suitable support for the electric generator. The piston is a light cast iron shell, well ribbed and provided with only two rings. The piston pin is fastened in the connecting rod and bears in the piston pin bosses. There is a deep groove around the piston at the pin and there are two horizontal grooves on each side of the piston pin hole, so that oil scraped off the cylinder wall may be fed into the piston pin bearing. The two piston rings have a stepped joint and are provided with saw cuts to keep down oil leakage and also to assure perfect packing. Two of these rings were found to do the work of the three used on the experimental cars. The pistons have crowned heads and are machined on all exterior faces. The connecting rod big end is lined with babbitt cast directly into the rod in order to insure good cooling of the bearing surfaces. In assembling, the rods are all weighed on a scale and grouped so that the differences in the weights of the big ends will not exceed 1/10 oz. In this weighing operation the piston pin end is mounted on a stationary knife edge and the big end on another knife edge located on the scale pan of the balance. [Image Caption 1] Sectional diagram of combined intake and exhaust manifolds, showing the vaporizing device employed on the Ansted engine used in Lexington car [Image Caption 2] Pedal controls, showing new equalizing device used on foot brake cables | ||