Why should the accelerator be released when clutch is depressed?

I'm learning to drive a manual car, and my instructor mentioned to release the accelerator at all times before depressing the clutch to change gear (up or down). Since I'm still learning the basics, I'm not interesting in the so-called %26quot;powershifting%26quot; when this can be done. But I want to know what HAPPENS, when we do not release the accelerator when we shift gear (either up or down). Does the car jerk forward or simply whirl loudly? Can anyone explain this concisely for me? Thanks!
Why should the accelerator be released when clutch is depressed?
When you depress the clutch the engine is now running free. Meaning there is no load on the engine. If you do not let up on the gas then the engine will turn over, or rev, a lot faster. It could turn so fast that all the parts can not keep up together, which causes parts to hit and then you have catastrophic damage.
Why should the accelerator be released when clutch is depressed?
The engine has a cycle it goes through at the shift, if the flywheel or gearbox in the car is moving rapidly like during a revving cycle and you shift you can chip the teeth off a flywheel or damage the gears and break teeth off there too.

If you are down shifting and you accelerate and shift the same thing can happen but more likely what with down shifting what will occur is the engine could burn out quickly. As you are not supposed to rev the engine severely while in a low gear past the shift point revving while downshifting will cause undue wear and risk of burning the insides of the engine chamber and or chipping a gear as I mentioned before.

You can stall a car by shifting incorrectly as well, I drive a stick and there are times I do some stalls too but I have gotten better recently.

Owned the car for a year so I don't get to drive the thing much.
If you keep the accelerator pedal pressed when you press the clutch, the engine will race and when you let the clutch back in, chances are the engine will stall.



So when you change gear, foot off gas, foot on clutch, change gear, foot slowly off clutch, slowly on gas. If you do this properly you will have a smooth gear change without any jerking, juddering, etc.



Your aim should be for a smooth gear change whether up or down, that is, a smooth increase or decrease in speed.
Your rpms go up and when you try and engage the clutch it will do one of two things. One it will burn up your clutch plate. Two it will burn your tires. But its fun as long as your not paying the bill on either. So you depress the clutch and hold down the accelerator, it is the same in an automatic as put the car in neutral and rev the engine then slam it in to 2 gear.
leave plenty of room in front of your car and i mean 100 yards and try it out and see what happens

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