i have a micra k11 1.0 engine and at 3500-40000 rpm sounds engine it coordinates in all car,I have checked all engines bases and they are ok,can you help me ?
Yep, i do get really loud in that frequency too believe it or not, then after that it go quieter again, i think its just a patch in acoustics however there are probably things that factor into it.
I dont know if the engine mounts are designed in any way to null noise but perhaps it could have something to do with manafolds, induction, exhaust system, there could be quite a few reasons, maybe a video though because then we could see if your micra is louder then it should be!
P.S, Your micra is awesome .
dont the cam timing kick in at that range? on my old VecB the car used to explode on said revs when the cam timing advanced and went like stink