Cars, Trucks-Cast Iron

The Slant-6, known within Chrysler as the G-engine, is one of Chrysler's two best known automobile engines, along with the Hemi V8. The engine is an inline-6 piston engine designed so the cylinder line is at a 30-degree angle from vertical. more...

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The engine was specifically designed to be slanted; it is not an upright engine that was simply installed in a slanted position like the engines in the Honda S2000 and the BMW M6. The 30° inclination of the Slant-6 gave a lower height overall engine package, which enabled vehicle stylists to lower hoodlines, and also made room for the water pump to be mounted with a significant lateral offset, significantly shortening the engine's overall length. In addition, the slanted cylinder block provided ample space under the hood for intake and exhaust manifolds of higher efficiency than were commonly found on other contemporary inline engines.

The engine was introduced in two sizes in 1960: The 170  in³ (2.8 L) "LG" (Low-G, referring to the relatively short engine block casting and crankshaft stroke) in the Valiant, and the 225  in³ (3.7 L) "RG" (Raised-G, referring to the relatively tall engine block casting and crankshaft stroke) in mid-size Plymouth and Dodge Dart models. In 1960, the engine was referred to by Plymouth division as the "30-D Economy Six" engine, the "30-D" referring to the 30° cylinder block angle.

The G-engine was offered in various configurations in the North American market until 1983 in cars, 1987 in trucks, and 1991 for marine, agricultural and industrial use. Replacement engines were still being built in Mexico as of 2000. In addition, the G-engine was used extensively by worldwide Chrysler divisions and subsidiaries in their locally-produced vehicles. It was also widely purchased by other original equipment manufacturers for installation in commercial vehicles, agricultural and industrial equipment, and boats.

The G-engine gained an enviable reputation for reliability and nearly unstoppable durability. The basic engine design incorporates much heavy-duty engineering, in part because the engine was designed from the start to be made of either iron or aluminum: The block is of a deep-skirt design, with the crankshaft axis well above the oil pan rails for structural rigidity. Although only four main bearings are used, they are of the same dimensions as those in the Hemi. Very efficient cooling and lubrication systems, a favorable rod ratio, and an extremely strong forged steel crankshaft (on engines made through mid-1976) all contributed to the engine's apparent indestructibility. In addition, the G-engine also provided better performance than most of its competition in the 1960s and 1970s. By the 1980s, the G-engine had been effectively strangled by continual addition of increasingly-restrictive exhaust emission control devices, without upgrades to the combustion chamber design, piston displacement or induction system, all of which were by that time quite antiquated. G-engine use in passenger cars was rapidly phased out in the early 1980s as Chrysler Corporation shifted to front wheel drive architecture.

Read more at Wikipedia.org