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There seems to be no noiseless thermic motor for cars or motorcycles on the market.

Is there a technical obstacle at making such a product ?

Is there a way to isolate/eliminate noises from the explosion process and from the moving parts ?

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    $\begingroup$ This question is very broad. There are a lot of different components that make noise. Each of these may require different methods of noise suppression if it is even possible. Is there a specific area of the motor that you are asking about? $\endgroup$ – hazzey Feb 14 '16 at 14:26
  • $\begingroup$ You are right, i'll try better on my next question $\endgroup$ – Manel Feb 14 '16 at 15:02
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Considering the nature of what an explosion is, I doubt we can just suppress the sound at it's source. The only way is to use a different motor technology.

However, car manufacturers tend to isolate the motor compartment from the outside with basic noise-suppressing technologies which are for example : covering the compartment with absorbing materials like foams or using bushed fixations (here). Most highly priced cars are well isolated, for example I know that you barely hear the sound of the motor in recent BMW cars.

Here is a picture of some bmw compartment. You can see that when the cover is closed, a plastic joint isolates the cover from the chassis. enter image description here

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