At constant vehicle speed, which gear ratio will lead to higher engine RPM?

Study for the Manual Transmission Exam. Use flashcards and multiple choice questions with explanations. Prepare thoroughly for your exam!

To determine which gear ratio leads to higher engine RPM at a constant vehicle speed, it's important to understand how gear ratios work in relation to engine speed and vehicle speed. A gear ratio represents the relationship between the number of revolutions of the engine (input) and the number of revolutions of the wheels (output).

In a lower gear ratio, such as 2:1, the engine will need to rotate fewer times to achieve the same amount of wheel rotation compared to higher gear ratios. Conversely, in a higher gear ratio like 5:1, the engine must turn many more times to achieve the same wheel rotation. This means that at a constant vehicle speed, a higher gear ratio (like 5:1) results in lower engine RPM because the engine does not need to work as hard to maintain that speed.

The 3:1 ratio, while higher than 2:1, does not represent the highest ratio available in the choices. Therefore, the engine RPM at constant speed will be lower with this ratio than with the next higher option.

The 4:1 ratio is also a step in the right direction, but it is still lower than the 3:1 ratio in terms of engine RPM.

The choice indicated as

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