New Chevrolet “Six”

Sun (Auckland), Volume III, Issue 706, 4 July 1929, Page 6 (Supplement)

New Chevrolet “Six”

FINE CAR FOR PRICE OF “FOUR”

In the introduction of a six-cyhpdp : car to sell in the price range of tl/ four, the Chevrolet Motor Corapanhas performed a test which must havi an important and far-reaching effect because Chevrolet has a driving pov. I behind it that has practically .1 parallel. ' a<> Although sweeping changes evident in both the chassis and body ! the car remains in the four-cylinder i price class. Greater power provides a tiveline* which shows an improvement on that j of the four, which was itself acknow. ledged as a very adequately powered car. The valve-in-head design, whicli has characterised Chevrolet productions for many years, is retained, the piston displacement being 194 c U bi c inches, as compared with 171 cubic inches in the four-cylinder model, ft is claimed that this increase of lj per cent, applied in a scientific manner has actually resulted in a greater j power output than the figure would suggest. The four-cylinder engine developed about 35 brake horsepower. The new six has an output of 46 horsepower, an increase of nearly one-third. Th e cylinder bore is 3.5-16 in., and the stroke is 3.4-4 in„ giving an R.AC. rating of 26.3 h.p. Both dimensions are smaller than in the four, the idea being that smaller cylinders and more of them is conducive to greater efficiency. The engine is of the high compression type now so popular in the United States. An innovation is the acceleration pump.-operated in conjunction with the throttle. A slow movement o! the accellerator does not operate the device, but when the throttle is opened wide for rapid pick-up the appartus shoots a priming charge directly into the intake manifold. This is a distinct contribution to flexibility—the aim of all automobile designers. The overhead rocker arms are automatically lubricated. A fuel pump replaces the familiar vacuum tank, the alteration ensuing ample fuel at sus tained speeds which would tend to exhaust a vacuum tank. A single plate dry clutch avoids lubrication attention for this unit. Hydraulic shock absorbers are installed in connection with long springs. The new model is the product of four years of research, during whicli over 100 motors were built for testing. Evidence of the popularity of Chevrolet's six-cylinder car is aeen in figures just released by General Motors, -New Zealand, Limited. More than half a million new cars have been delivered to owners since the first of the year throughout the world. Nearly every month this year has seen a new monthly production record. In order to satisfy the demand for cars, output has been steadily increased as fast as consistent with precision manufacturing methods.