Engine sound

[aygoes]

Hello guys,

I surely will get this issue checked up by an authorized dealer, but I still just ask you.
Is this sound of my new Aygo normal? I have attached here tow mp3 sound files. Doesn't sound it like Diesel engine ?
I guess when I first bought the car wasn't like that.

1.mp3

2.mp3

[FROSTYBALLS]

The Aygo engine is a three cylinder petrol engine, and will sound different to and not as smooth as a four cylinder petrol - has a more uneven sounding thrum. Sounds OK to me, and similar to a Hyundai i10 courtesy car I recently had, and a Skoda Citigo I had as a hire car a couple of years ago - both of which also have three cylinder engines.

[aygoes]

1 hour ago, FROSTYBALLS said:

The Aygo engine is a three cylinder petrol engine, and will sound different to and not as smooth as a four cylinder petrol - has a more uneven sounding thrum. Sounds OK to me, and similar to a Hyundai i10 courtesy car I recently had, and a Skoda Citigo I had as a hire car a couple of years ago - both of which also have three cylinder engines.

Thanks, so why the three cylinder sounds not nice than four cylinder ?

[FROSTYBALLS]

See the following:

A four-cylinder engine would be much smoother sounding than a three cylinder engine. That’s because a normal internal combustion engine is a four stroke cycle – intake, compression, combustion and exhaust (suck, squeeze, bang, blow). So at any point in time in a four-cylinder engine, there is one cylinder that is always on the power stroke (combustion) in the cycle. In a three-cylinder engine there is a difference in the way the pistons are arranged on the crankshaft, which leads to a delay of half a cycle between power strokes. In a three-cylinder engine a power stroke happens after every 120 degree rotation of the crankshaft, while in a four-cylinder engine it happens with every 90 degree rotation of the crankshaft (for one full 360 degree rotation of the flywheel). This shows up as a slight gap in the firing time, and hence a rougher engine note.

[fordulike]

2 hours ago, aygoes said:

Hello guys,

I surely will get this issue checked up by an authorized dealer, but I still just ask you.
Is this sound of my new Aygo normal? I have attached here tow mp3 sound files. Doesn't sound it like Diesel engine ?
I guess when I first bought the car wasn't like that.

1.mp3

2.mp3

Sounds normal to me, exactly like mine!

[Wiz201]

sounds like a normal 3 cylinder engine to me, you get used to it after a while lol.