My engine is a b18a1, when I rev to about 2000rpm I hear a knocking sound, the car has had its oil changed, coolant flushed and all other general maintenance, I'm a little worried just because I've never heard that sound come from my car, the car is stock besides headers and air intake

 

Spun bearing mayby, a sound clip may help. 94

 

Im listenig to it right now, it goes away at rpms above 2500, it sounds like a valve adjustment is needed, I'm .just hoping it isn't a rod knock or anything to in depth

 

Post a video