Manual Transmission Automobile Questions- Changing Gears?

I learned on an Automatic Toyota Camry 1988 4 speed, and I'd like to get a manual as my next car to experience the additional control. Anyway, I was reading up on changing gears which is the fundamental difference between auto and manual transmission, and while I fully understand the ';process'; of changing gears, I still dont quite get the ';purpose'; behind it. I have two things I need to be cleared up.



1- I understand that you need to start accelerating in first gear, and shift up when appropriate as your rev's increase. From a functional perspective, why wouldnt I be able to start accelerating (from stationary position) in 3rd, 4th, 5th gear?



2- What exactly is it that allows a higher gear to accelerate faster using less revs, from a technical perspective? I've looked into the functionality of an internal combustion engine previously, but I've never touched on the functionality of the gearbox so I'm not too sure how it works in relation to the overall functioning of the vehicle.



Any replies would be much appreciated. Thanks in advance.Manual Transmission Automobile Questions- Changing Gears?
It's actually pretty simple to explain: the gears are different sizes. That's it. The ';size'; or ';ratio'; of 1st gear is designed to get the car moving without wearing the clutch out or making the engine work too hard. Each following gear gets a higher ratio so the engine moves slower at higher road speeds, making the car's work easier. The lower your revs, the more efficient your vehicle becomes. When you need the power, you put the car into a lower gear to get your revs in a more optimal power range.

Like the first person mentioned, try riding a multi-speed bicycle. If you try taking off in the highest gear, it's quite difficult. Likewise, if you try going fast in the lowest gear, you have to pedal very hard and it's tiring. So you are the ';engine'; essentially.

In a nut shell, the car's different-sized gears are basically there to make the engine's job easier. There really aren't any set ';rules'; for optimal rev ranges while driving though. I generally shift at around 2500 RPM in regular driving, which is pretty economical. When I'm done accelerating, I upshift until I bring my car's engine speed under 2000 RPM so I get good gas mileage. All vehicles and driving styles are different though. You'd probably want to shift sooner in a large vehicle or something that runs on diesel, since they have a lower redline. In a car with a small engine (like smaller than a 2-liter), they typically are more willing to rev since they have higher redlines, which allows you to shift later while still maintaining good efficiency.

Anyway, I hope I was helpful.Manual Transmission Automobile Questions- Changing Gears?
1. Try riding a bike with set of gears (one on back tire and one pedal side). Try setting it in both smallest gear and see how you move from rest. I bet you that by the time you reach one block you'll be exhausted. It's easy to pedal that way but how much energy do you need to get you going. But try to set the both on the biggest gear and see how you accelerate. It's kinda hard but you cover more ground with less pedal. Get the idea?

2. High gear means more revolution in turn makes you move faster.



It's pretty much for the engine not to damage it. That's why you have to start on low gear, give your car enough speed from rest then move the gear accordingly.
1. technically you can do this, its very bad for your trsnny and wont last long.



2.gear ratios inside the transmission
If you're about to make the jump from an automatic to a manual, shouldn't you be more concerned with how to drive the manual and not what is happening while you are driving it? Almost sounds like you are questioning the design of the manual as a whole..
ok so let me explain you a simple logic and u will get both the answers..

for gears we say

N1xD1=N2xD2.



N-speed of gears in revolutions per sec(rpm)

D-Diameter of gears.



so that means the more is the diameter(size) of your gear less will be its speed..

and thus while you put 1st gear it consumes more revolution and reaches or restricts to less speed with high rpm.

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