What Causes the Noisy Sounds of Engine Performance?

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Discussion Overview

The discussion revolves around the sources of noise produced by engine performance, specifically focusing on the sounds associated with engine strokes. Participants explore whether the noise is primarily due to combustion events or the expansion of gases during exhaust processes, with references to specific engine types and their characteristics.

Discussion Character

  • Debate/contested
  • Technical explanation
  • Exploratory

Main Points Raised

  • Some participants suggest that the typical engine noise comes from a mixture of combustion noise, exhaust noise, and induction noise.
  • One participant emphasizes that the sound of the engine's repetitive strokes may be attributed to the shockwave produced by expanding gases when the outlet valve opens.
  • Another participant argues that combustion noise is the primary contributor to the noise signature of an engine.
  • There is a discussion about the differences in sound between air-cooled and liquid-cooled engines, with air-cooled engines allowing some explosion sounds to be heard.
  • Some participants express uncertainty about whether the sound is primarily due to combustion events or pressure pulses from the exhaust.
  • A participant mentions that the exhaust system can significantly influence the perceived sound, including tuning systems that modify exhaust noise for aesthetic purposes.
  • There is a clarification that combustion is a controlled burn rather than an explosion, which some participants challenge as a misconception.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the primary source of engine noise, with multiple competing views remaining about the contributions of combustion noise versus exhaust pressure pulses.

Contextual Notes

Participants acknowledge that the complexity of engine noise is influenced by various factors, including engine design, exhaust systems, and RPM, which complicates the discussion of sound sources.

  • #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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