The original 194 CID engine was replaced with an improved 206.8-cubic-inch (3.4 L) variant (the stroke was increased to 4 inches (101.6 mm)) in 1933, introduced in the Series CA Eagle.
This engine was used in all Chevrolet passenger cars from 1929 through 1932. Bore and stroke was 3 + 5⁄ 16 in × 3 + 3⁄ 4 in (84 mm × 95 mm).Ī balanced crankshaft was introduced for 1932, while a higher (5.2:1) compression ratio upped output to 60 hp (45 kW). This engine used a forged steel crankshaft with three main bearings and cast-iron pistons.
When introduced in 1929 the six-cylinder was 193.9 cubic inches (3.2 L) in size and produced 46 hp (34 kW).
The new engine was mockingly called the "Cast-Iron Wonder" and "Stovebolt Six" for its seemingly old-fashioned design, : 12–14 but it was famously advertised as "a six for the price of a four" to great success: the Chevrolet was priced only $100 more than the Model A, and the brand regained the sales lead from Ford in 1931. Knudsen and marketing executive Richard Grant insisted that the new six-cylinder design also use overhead valves. Chevrolet had long been known for its " valve-in-head" design in the previous four-cylinder engine, so General Manager William S. : 14 Chevrolet had been considering switching to a six-cylinder engine since 1925, and the ascendency of the Model A precipitated the switch. The Model A, with its improved 40 hp (30 kW) four-cylinder, compared much more favourably to the 27 hp (20 kW) Series AA Capitol, and sales of the Model A surpassed Chevrolet by 1929.
The 1927 Chevrolet Series AA Capitol had sold very well-over a million units sold as compared to about 400,000 of Ford's Model T-but Ford had introduced a new model in the autumn of 1927: the Model A. The new six-cylinder engine was introduced in 1929 Chevrolet cars and trucks, replacing the company's first inline-4. "splash" lubrication for the rod bearings and pressurized lubrication to the three main bearings.
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