4dr7 engine manual5/24/2023 ![]() ![]() Additionally, because the internal combustion engine is most-efficient and most-powerful at different speeds, multiple gear ratios are necessary to extract the most usable power or best fuel economy, depending on driver demand. Still, since the engine was so small, it was an acceptable compromise.Įventually, with the development of more powerful engines, multiple gear ratios were required, reducing the jerky takeoff and enabling higher speeds and even a reverse gear. The vehicle would lurch forward as soon as the single drive belt was engaged, and speed was slightly variable, depending on engine speed, but going even faster would damage the engine. It worked, but the Benz Patent Motorwagen offered a slow and jerky ride. When the first automobile was built, the tiny engine was connected directly to the driveshaft.
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