I recently, messed up my gsr motor and swapped a b16a in its place (temporary)
and im concerned with a noise that the engine makes after 7600 rpm it sounds really bad like its the valves smashing or something, my old gsr made the same noise but only a 9000 rpm anywhere up to 8900 was ok. I know the 9000 is to much on stock everything and thats why it would make bad noises, but why would the b16a make thins noise a 7600?? it should be good to at least 8000 rpm what could it be??
the b16a came from japan with an auto tranny on it it runs good
there is 0 oil cunsumption, (i swear on my life) i could not beleive my eyes when the dipstick had all the oil on it after i drove 4000 KM, its unreal.

if someone could please help me to figure this out it would be appretiated.

also i dont think its detonating cause i have 255 hp lph pump and fp is at 42psi and p28 is chipped. no knocking.

 

Possible rattle from the exhaust. also check your valve clearance and do an adjustment that sounds like the most probable reason for the noise also check the distributer for brown dust. when the bearings start going out it leaves that dust inside the cap that always makes a loud grinding sound though.let me know what you find out then I might have other ideas for you