first of all when you start engine it will first roll noiseless to start or less their is know oil in the engine for lublicant the bearing befor can hear
One of the reasons why cars go fast is what size of an engine they have.
In some cars, you can get the rear bearing by dropping the transmission. For the rest, no.
It's the turbo charger. A: if you feel a small vibration in your gas pedal plus the noise you said, it should be the wheel bearing, has to be changed (cost 50)
Their engine battery and when the car is on makes a roaring sound when it is started
A whinig or howling sound coming from a cars wheels means that a wheel bearing is bad and should be replaced.
Sound proofing is used in cars and jet airplanes, to name a few, in cars they line the engine compartment with it to dampen the noise from the engine from from being heard inside the vehicle. Jet air planes, they do is almost the same thing.
the high pitched sound which I'm guessing is the whirring sound from the engine's turbocharger/supercharger. the sound comes when the impeller blades of the TC/SC rotates at very high velocity.... it's very similar to the sound of a jet engine but only on a small scale.
A bad wheel bearing is quite possible. Without hearing the sound, can't say for sure.
Trucks are louder than cars because of the bigger engine and more space for the sound waves to travel in, and the torque on a truck is considerably bigger with a bigger exhaust to compensate for it, which all results in a louder sound.
Because of the type of engine, and how the exhaust is made. If take away the silencer on the exhaust pipe, you will get a whole different sound. And If the engine has for example a four cylindre, it will make a nicer, and not so deep sound. With a 8 cylindre engine , it will make a more dark and "groggy" sound.
A cars tach jumps and runs with engine rpm.Sometimes if it jumps and changes engine sound,the throttle position sensor needs changing.If it jumps with no engine speed or sound change it means your alternator is going bad.
You may be hearing the fuel pump. Turn the ignition on without starting the engine and listen carefully for the fuel pump. It will only run for a few seconds if you do not start the engine. Is that the sound you are hearing? You may also be hearing the blower motor which runs at it lowest setting continuously on some cars.