F1 Engine Noise?

[engin007]

Guys I just wanted to know that why does an F1 car engine makes so much noise compared to the other V8 road car engines?

[West]

Much higher revs, no sound insulation for the car, no mufflers. There's probably more tho.

I can hear JGTC cars from miles away and they rev nowhere near as high... they don't have mufflers either.

[engin007]

Thanks for that, but why the F1 guys dont use 'sound insulation'?

[West]

Unnecessary weight.

[manchild]

Unnecessary weight.

I'd add aerodynamical drag and power loss too. "Sound insulation" chokes engine and takes away power.

[yelowca]

I think that its has something to do with the width and length. Also, the compression ratio of these engines mist be very high.

[manchild]

Less noise can't improove performace of any engine so unless regulations limit noise level there are no noise reduction devices on exhaust.

Compression ratio in F1 is more-less the same as on any other extremely tuned normally aspirated engine so it has no influence on noise level.

Noise level = difference between pressure in cylinder when ehxhaust valves open vs athmospheric pressure. That includes speed of opening of valves and diameter and lenght of exhaust as well as frequency/rpm.

[Bender]

One of the things to consider is the sound frequency the engine is making.

I think the main sound is around 800-1000Hz(?) and there are harmonics above that, the human ear is most sensitive to sound at about 2800-3500Hz because of the length of the ear canal and the shape of the ear.

So its not that the F1 engines are making more sound than any other engine, its that they are making sound that is more easily heard, so it sounds louder

I think that makes sense.

[mep]

West wrote:
Unnecessary weight.


I'd add aerodynamical drag and power loss too. "Sound insulation" chokes engine and takes away power.

I think it's mainly the loss of power, the litle extra weight is not so
important.

Benders explanation is very good.
Importand for the sound is the arrangement of the exaust pipes.
If you watch a DTM race you will notice that the Mercedes engines are
much louder (higher Frequency) than any other engine and they
have a other arrangement of the pipes.

[DaveKillens]

Sound is a function of when something creates amplitude and frequency. Just look at a modern Formula One exhaust, and it's four into one, and they are a partial megaphone. So you get extremely high frequency pulses of short duration, which gives high amplitude, loud. And since there is no attempt at sound control, they are plain loud. You can diminish the exhaust sound by adding some form of muffler and sound deadening materials, but that would add mass, and probably rob power. It is possible to construct an exhaust that would lower the sound level without robbing power, but it would have to be as large as a house.

[tarzoon]

Don't forget other parts, such as transmission or gears. They are different from the ones found on road-going cars, where the compromise between noise and performance is very different.

[Tom]

I'm treading carefully here around boy racer terms but can anyone tell me how the exhaust system (back pressure, shock waves etc) affects F1 design?

[Smurf]

Does anyone have any saved sounds of the new cars?

Im looking to compare the Ferrari, Renault and McLaren..

if anyone has it on WAV or MP3 format?

[Tp]

I'm treading carefully here around boy racer terms but can anyone tell me how the exhaust system (back pressure, shock waves etc) affects F1 design?

You want to avoid positive pressure waves (travelling towards the engine) and to encourage the negative pressure waves (away from the engine) - thus helping to draw the spent gases away from the cylinder therefore increasing performance.

[zac510]

Does anyone have any saved sounds of the new cars?

Im looking to compare the Ferrari, Renault and McLaren..

if anyone has it on WAV or MP3 format?

Motorensound!

http://www.f1total.com/audio/