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).
Page from an automotive industry journal featuring articles on engine technology, car models, and an advertisement for crankshaft forgings.
| Identifier | ExFiles\Box 132\1\ scan0125 | |
| Date | 11th March 1939 | |
| ECONOMICS OF BUS OPERATION 349 heat to the inlet manifolds, which reduced the volumetric efficiency. After the installation of special unheated manifolds the power loss was still 22 per cent. It has been claimed that a good part of this loss can be prevented by increasing the compression ratio. This, however, holds only in the case of more or less obsolete low-compression engines. The Paris omnibus company uses a compression ratio of 6.4 in engines with poppet valves, and 7.5 in engines with sleeve valves. These high compression ratios are practical with special fuels having an octane number of 87. If the compression ratio were increased to 8 it would have little effect besides increasing the stresses on working parts. It is, therefore, concluded that if gas is to be used as fuel a reduction of about 20 per cent in power must be figured with, and if this should reduce the average speed by only 5 per cent, it would add about 25 million francs to the annual operating costs of the company.—La{L. A. Archer} Technique Moderne, Dec. 1. THE International Association of Recognized Automobile Clubs, generally referred to as the AIACR (the initials of its French name), decided at a recent meeting that in future the minimum distance for Grand Prize races shall be 300 instead of 500 kilometers (186 instead of 310 miles). The Association will hold its 1939 spring meeting in Washington, D.{John DeLooze - Company Secretary} C. The American member of the Association is the American Automobile Association (A.A.A.). Austin's New Eight (Continued from page 343) panels are detachable by the removal of three bolts and nuts. The radiator grille consists of groups of six half-width die-cast bars, each group being secured by integral dowel pins to the one above and below; thus sectional renewals are possible. It is of interest to compare the leading dimensions, prices, etc., of this new Austin with those of three other Eights in big demand, viz., Ford, Morris and Standard, the latter being the only one with independent front springing. Make Cu. In. Wheel- Track Weight Prices base in. in. lb. from* Ford 57 90 45 1640 £115 Morris 56 90 45 1730 128 Standard 62 83 45 1620 129 Austin 55 88 45 1650 128 All have L-head engines and all except the Austin have three speeds. * Two-door fixed-head sedans. Four-door type with sliding roof:—Ford £135, Morris £149, Standard £139, Austin £149. Automotive Industries New Torsional Vibration Damper (Continued from page 344) as previously in the direction S. After the impact, the hub starts on a new oscillation, of reduced amplitude and displaced in phase with relation to the first. In the course of this new oscillation the hub passes the position of equilibrium. Then the oil channels to chamber U are cut off and a new impact takes place, after which the cycle is repeated. The oscillations of the hub therefore are confined between the points of impact in chambers U and V, and the amplitude will not be increased by stronger exciting forces, as the damping mass would then have a higher speed relative to the hub and the impact would be stronger. The action of the damper is said to be independent of the frequency of oscillation of the hub, and no resonance can occur. The patents on this vibration damper are owned by the Aktiebolaget Atlas Diesel of Stockholm. [Advertisement text] FORGINGS WITH A BACKGROUND — WYMAN-GORDON FORGINGS are under laboratory control from raw material to finished product. That's why they are always guaranteed forgings. WYMAN-GORDON THE CRANKSHAFT MAKERS WORCESTER, MASS · HARVEY, ILL. · DETROIT, MICH. When writing to advertisers please mention Automotive Industries March 11, 1939 | ||