Pontiac was an automobile brand that was owned, made, and sold by General Motors. Introduced as a partner produces GM's more costly line of Oakland automobiles, Pontiac overtook Oakland in popularity and supplanted its parent brand entirely by 1933. Sold in the United States, Canada, and Mexico by GM, Pontiac was advertised because the performance division of General Motors from the 1960s onward.
Amid late 2000s financial problems and restructuring efforts, GM announced in 2008 it would follow the same path with Pontiac because it had with Oldsmobile in 2004 and discontinue manufacturing and marketing vehicles under that brand by the finish of 2010. The final Pontiac badged cars were integrated December 2009, with one final vehicle in January 2010. Franchise agreements for Pontiac dealers expired October 31, 2010, leaving GM to target on its four remaining North American brands: Chevrolet, Pontiac 2021 Buick, Cadillac, and GMC.
The Pontiac brand was introduced by General Motors in 1926 whilst the companion marque to GM's Oakland division and shared the GM A platform. Purchased by General Motors in 1909, Oakland continued to make modestly priced automobiles until 1931 when it absolutely was renamed, Pontiac. It absolutely was named following the famous Ottawa chief who had also given his name to the town of Pontiac, Michigan where the car was produced. Within months of its introduction, Pontiac was outselling Oakland, that was essentially a 1920s Chevrolet with a six-cylinder engine installed. Body styles offered included a sedan with both two and four doors, Landau Coupe, with the Sport Phaeton, Sport Landau Sedan, Sport Cabriolet and Sport Roadster. As a result of Pontiac's rising sales, versus Oakland's declining sales, Pontiac became the only companion marque to survive its parent, with Oakland ceasing production in 1932.
Pontiacs were also manufactured from knock-down kits at GM's short-lived Japanese factory at Osaka Assembly in Osaka, Japan from 1927-1941. Pontiac engineer Clayton Leach designed the stamped steel valvetrain rocker arm, a simplified and reliable alternative to a bearing-equipped rocker. This design was subsequently found by virtually every OHV engine manufacturer at one time or another. Pontiac began work on a V8 configuration in 1946. This was initially meant to be an L-head engine, and 8 experimental units were built and extensively tested by the conclusion of the 1940s. But testing comparisons to the OHV Oldsmobile V8 revealed the L-head couldn't compete performance-wise. So, as well as building a new Pontiac Engineering building in 1949–1951, the decision to re-direct the V8 to an OHV design delayed its introduction before 1953 model year, however Buick division was introducing its new engine (nailhead V-8) in 1953 and asked the corporation to keep back or delay Pontiac's V-8 introduction before the 1955 model year which it did.
In mid-1956, Pontiac introduced a higher-powered version of its V8. Among other things, this version of the engine was built with a high-performance racing camshaft and dual 4-barrel carburetors. This was the initial in some NASCAR-ready pre- Super-Duty V8 engines and introduced the long distinct multi-carburetor equipped engines that saw Pontiac 2021 develop into a major player through the muscle car and pony car era of the 1960s. Interestingly, the enlarged 1956 Pontiac V8 found its way into light-duty GMC pickup trucks.
PMD used Carter 1-barrel carburetors for quite some time, but by enough time of the 2nd generation V8 engines had switched mostly to 2-barrel offerings. These also were the cornerstone for the Tri-Power setups on the engines. The Tri-Power setup included one center carburetor with idle control and two end carburetors that did not contribute before throttle was opened a lot more than halfway. This is accomplished two ways, mechanically for the manual transmission models, and using a vacuum-switch on the automatics. This went through various permutations as it was only a manufacturer installed option in from 1957-1966.
PMD also had a square-bore 4-barrel during the time, but this was rated at a lesser power than the Tri-Power. This carburetor was later replaced by the Quadrajet, a spread bore.'Spread-bore'identifies the difference in sizes between the primaries and secondaries, using smaller primaries paired with larger secondaries for increased airflow at wider throttle with fuel delivery changes akin to the two-plus-four advantageous asset of Tri-Power but with a single carburetor. It should be understood that the Q jet wasn't the only thing that gave the top GTO 400" engine and the 428 H-O engines the same H.P. whilst the 389 and 421. Apart from the displacement advantage the newest engine had redesigned cylinder heads with different valve angles and larger ports. The different valve angles allow for larger diameter intake and exhaust valves. There have been many tests whenever a Tri-Power set-up was put into a 400" or 428" engine they made, much more, H.P. than the usual Q-Jet. By the conclusion of the muscle car era, the Quadrajet setup had end up being the nearly ubiquitous choice on PMD engines. The Quadrajet design continued until 1990 for Oldsmobile V8 applications, along side added computer controls to meet up emissions and fuel economy standards.
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