Depends.
For an average driver - no. You can safely assume that the engine and all its parts are well sized for task it's asked to do. But for racers and tuners, who run their engines in another RPM range than average drivers, it can be beneficial to change to another pulley size. A smaller pulley will work just as well at a higher RPM, and free up a few HP that can be used to accelerate the car instead.
Look on your car's engine.
A car engine
The idler pulley has nothing to do with the brakes. If the idler pulley is bad it could throw or break a belt, and then your engine will stop.
no it is a belt it fits onto a pulley and enables your fan to turn to keep your engine cooled.
No, a pulley will not keep a car from starting. A pulley is part of a wheel, and it is held on by an axle. There are many other components that go into this, but none of them have to do with the engine working.
Since we don't know what car the engine's in, and many manufacturers made an engine this size, we can only go by this: If the car is ANYTHING but a Honda, there's generally a line on the crankshaft pulley and another on the engine block. If it's a Honda, the line is on the flywheel and there's a hole in the bellhousing to see it through.
The water pump uses the timing belt to spin the pulley on it. The pulley than propels the coolant throughout the engine. This keeps the cars engine at a moderate temperature.
Not easily. Get a manual on your car.
The pulley allows the re-direction of force by 180 degrees. A ramp cannot do that. Say you need to lift an engine out of a car's engine bay. You would use a pulley because as you pull straight down the engine goes straight up. That presumes that you weigh more than the engine.
How much horsepower in a 2.2 liter car engine?
The size of the engine does not matter. If one car has the CCAs or cold cranking amps to start your car it will and chances are it has more than enough
In the car's manual.