suzuki mehran has different engine sounds... some mehran give shrill sound when u acclerate the engine other give heavy sound... is ke kya wajah hai... what thing is making the difference in engine sound... the sound comes from the engine not from cylincer.
engine oil and engine condition are main causes
what i have noticed is that mehran engine or any other engine has very delicate sweet sound. i dont know how to describe it but u feel it when u hear it. on the other hand an opened or beatup engine has very rough sound. i yet have to see a sweet sounding engine which is repaired. however, i still dont know what causes engine sound to change after overhaul.
i am also curious to know what part is affecting the engine sound & how to improve the engine sound
There is no one reason for this phenomenon.
All engines are different in mileage, condition, timing, lubrication etc,
Thus it is not possible to definitively answer your question.