What Causes the Noisy Sounds of Engine Performance?

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SUMMARY

The primary causes of engine noise are combustion noise, exhaust noise, and induction noise, with the loudest source being the shockwave from expanding gases during the exhaust stroke. In air-cooled engines, some noise is also attributed to the explosion of the fuel mixture, while liquid-cooled engines muffle this sound due to water channels. The discussion highlights the complexity of engine sounds, emphasizing that the sound signature is influenced by factors such as exhaust system design and engine RPM. Advanced technologies, like digital sound sampling systems in mufflers, can modify exhaust noise to enhance or alter the sound profile of vehicles.

PREREQUISITES
  • Understanding of internal combustion engine operation
  • Familiarity with exhaust system components and their functions
  • Knowledge of sound wave principles and acoustics
  • Basic concepts of engine cooling systems (air-cooled vs. liquid-cooled)
NEXT STEPS
  • Research "exhaust pulse dynamics in internal combustion engines"
  • Explore "acoustic tuning in automotive exhaust systems"
  • Learn about "combustion noise vs. detonation in engines"
  • Investigate "the impact of engine RPM on sound frequency"
USEFUL FOR

Automotive engineers, mechanics, sound engineers, and enthusiasts interested in understanding engine acoustics and optimizing vehicle sound profiles.

  • #31
A citizen of the USA.
 
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  • #32
that link was indeed helpful.. infact that was the sound i m talkin about. that potato-potato-potato sound.
n cud they possibly trademark that sound? i mean some crazy scientist can do his stuff on his stupid bike's exhaust system n get it to roar like a HARLEY! what then?
 
  • #33
Danger said:
Where's 'over here'?

on PF... where else:-p:-p
 
  • #34
PF isn't over here... it's just HERE. :biggrin:

Be educated... be very educated... :rolleyes:
 
  • #35
Danger said:
PF isn't over here... it's just HERE. :biggrin:

Be educated... be very educated... :rolleyes:


yea i got it dude.
n i m educated:mad:
 
  • #36
now what's the final answer to my question?
 
  • #37
The engine is silent; what you hear is the driver farting. The sound is entirely dependent upon his diet.
 
  • #38
Danger said:
The engine is silent; what you hear is the driver farting. The sound is entirely dependent upon his diet.

:confused::confused::confused:
how come i didnt think of that? now i know why they call it POTATO-POTATO-POTATO sound:smile::smile::smile:

now anyone serious abt the question?:mad::mad:
 
  • #39
At this point, I doubt it.
If you want 'serious', go back to the first couple of pages where your question was repeatedly answered.
 
  • #40
well actually, only gaming addict understood my question right
no one else did
 
Last edited:
  • #41
Wrong, pal. We all understood it, and answered to the best of our abilities. For some reason that I can't begin to fathom, you are unwilling to accept those answers. So I really have to ask you... why do you ask a question to which you don't want an answer?
 
  • #42
i got my answer. n i want to get few good explanations about those. so that's why i m askin it.
n yes i do appreciate all of your help, those links really provided me with some good reasons.
 
  • #43
buster said:
those links really provided me with some good reasons.
That might be part of the problem. There are no reasons in science. We strive to answer 'how', but 'why' is a philosophical pursuit.
 
  • #44
buster said:
aaaaaaaaa... what's a YANK?

Also known as "Septic" @ arrse.co.uk
 
  • #45
Danger said:
We strive to answer 'how', but 'why' is a philosophical pursuit.

fair enough. but i didnt ask how or why, i asked which.
now let me eloborate what i asked & what most of u assumed i asked.
i m not talking about the sound that AC makes or the fuel pump makes or any other thing(fans, belts, pulley, gears) attached to the engine makes, these are all the result of running engine. this is what you guys have been assuming(ofcourse except gaming addict(hehe i m gaming addict too!:-p:-p))
what i have been looking is the source of POTATO-POTATO-POTATO sound (or the farting noise as Mr DANGER suggests), the power stroke(or the CONTROLLED combustion, still i would say it as the explosion of charge regarding the problem), or the exhaust stroke(high pressure gases going out via outlet valve, thus producing a shockwave(as i understand))??
i say it is the 2nd one..
now do i need to get more clear?
and also, i think i have my answer correct with enough explanations
 

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