Rok_Stok

It has always made this sound, and you can hear it the most from inside the car. It sounds like a knock, but the sound doesn't get any louder as I rev the engine. The engine revs fine and everything, it just sounds like a diesel at idle.

http://www.youtube.com/watch?v=ptm2UloiFHE

Adamvanxxx

Is there any exhaust leaks? What's the idle at? And it sounds Like you have some valve noise, check valve lash.

Rok_Stok

No exhaust leaks, there used to be but I fixed them. Idle is at around 750. My valves are loud, but I've adjusted them numerous times, and they're set on the tight side of spec right now.

EJeff8

If you hear it from the cab, it's most likely an exhaust problem.

Adamvanxxx

Yea everything else sounds good. From the inside it sounds like an exhaust leak, what are the things done to the car?

D16SiHatch

interesting noise. might want to check into the LMA's (lost motion assemblies) as being part of your valve noise

Rok_Stok

Completely stock. It's weird, I used to have a Mugen B16A header and it sounded like total crap, and I've had an eBay header as well and got the same sound. It sounded like a diesel, I could clearly hear all of my valves tapping and there were no exhaust leaks whatsoever, so I think there are some problems with my head. My friend's header on his B-series sound like stock, so it has to be my head.

I've been curious if my LMAs were bad too since apparently the B16A is notorious for their LMAs. The sound inside the cabin is a low-pitched, almost knock. I can't put my finger on it.

jvgjunior

I have one D16Z6 Civic coupe and I have the same problem, not that loud but I can hear something like that.

I assume (couldn't find it yet) that it come from the Air Conditioner compressor, ore Hydraulic pulley... something like that.... hahahaa

Rok_Stok

Hmm, it's never had A/C, but I just installed it, doesn't relate to the sound though. I can hear the low-pitched "knock" outside of the car if I stick my head really close to the intake manifold. I don't think it's a rod knock because it goes away when I rev it, and rod knocks that I've heard got louder when the engine is revved. Piston slap I'm not as sure about, I don't think it makes a low-pitched noise though. I'm still leaning towards the head because of the crazy sound it makes when I simply bolt on a header.

tlarimer

iTrader: (3)

That sound is LMA's being bad or valve's out of adjustment. The pissed off typewriter sound is notoriously bad LMA's. Does the sound go away as you rev it?

Readjust valves in accordance with honda FSM, if sound persists, order yourself a set of LMA's.

rndmheroxx

sounds exactly like my car when it was super retarded b/c after i change my distributor cap I accidentally left it all the way cranked towards the radiator. try playing with that, and yeah either way you need to adjust that lash lol

EgUnoGodfather

could also be the cam as it goes around it might be clicking something u should check that out.