Quote:
Originally Posted by shiv@vishnu
I don't agree with with the description of "metallic" noise. It's not metallic. People who describe it as such probably have never heard a real metallic engine noise before 
It's just induction/valvetrain noise. You hear it in all NA engines to and extent. You hear it clear as day in VTEC honda motor just before the secondary cam kicks in. Personally, I don't even hear it unless I pay attention to it. However, I can hear a knock with the radio on, in the middle of a conversation. I guess I'm just more sensitive to things that unfriendly to engines. |
Let me throw this out here, I am not saying there is something wrong.
This motor and countless tunes are quiet during the overlap phase.
Why does pushing the angle change so far create "valvetrain" noise?
Because it is audible on the street, inside the cabin all the time.
If you back off the VVT angle the chatter goes away.
The angle change you are introducing is creating the noise, it's not something "typical."
I am not looking for a generic answer here.