In automotive design, the top hat is one or more car upper physique structures that may share a common platform. The higher physique could vary from crossover to a sedan or coupe thereby creating economies of scale and product differentiation. Because automakers spend nearly all of time and money on the development of platforms, platform sharing affords manufacturers the ability to chop costs on research and development by spreading it over a number of product traces. Manufacturers are then able to offer products at a decrease value to shoppers.
GM used similar methods with its “J” platform that debuted in mid-1981 in four of GM’s divisions. Subsequently GM launched its “A” bodies for the same four divisions utilizing the same tread width/wheelbase of the “X” physique platform, but with larger physique work to make the cars appear bigger, and with larger trunk compartments. Even Cadillac began offering a “J” physique mannequin called the Cimarron, a a lot gussied up model of the other 4 manufacturers’ platform siblings. A comparable technique utilized to what’s known as the N-J-L platform, arguably probably the most prolific of GM’s efforts on one platform.
For the 1981 model 12 months solely, Cadillac offered a characteristic on its V8 engine called the V8-6-four. On this engine, up to four cylinders could possibly be deactivated whereas cruising to save lots of gas. However, the system suffered from numerous drivability issues as the pc expertise on the time could not deactivate/reactivate the cylinders quick enough. Many owners got fed up with the engine’s poor efficiency and had the system disabled by mechanics. The 1990 General Motors U Platform minivan, bought as the Chevrolet Lumina APV, Pontiac Trans Sport and Oldsmobile Silhouette, was introduced for the 1990 mannequin 12 months in an try to supply a stylish alternative to … Read More