Any Idea what that noise is?
 

Looking for opinions what do you hear?

It is a DRM 500 package top end ported It has aftermarket connecting rods, after market pistons marked PMI388/I not sure about the cylinder liners, and I am pretty sure it had Nitrous run on it from the holes drilled in my storage compartment.

I have no idea the abuse this engine had prior to me getting it but it has been fine for 19 years with a couple of misfire issues here and there.

I have been driving it as a daily for years and it has always puffed a little oil smoke.

I know I have something going on so im not to worried about it just want to figure it out before I yank it out.

Video

https://www.youtube.com/watch?v=5V4tnQdGc6Q




I had Amsoil 10w40 high zinc in it put in last spring.

I checked all over the place with my mechanic stethoscope couldn't really isolate it.
Oil pressure was still good
Last compression test was good but I have not checked it yet.


I am pulling the oil pan to check for anything obvious I'm guessing a rod bearing.


lifter? piston ring? piston slap or a rod knock.


I cut open the oil filter and I have small ferrous metal in the filter not a lot but some.


Anyway why do you all think it is?

Re: Any Idea what that noise is?
 

Sounds like you have some piston slap.


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Re: Any Idea what that noise is?
 

Seems to be one "tick" per engine revolution (i counted 15 ticks in about 2 sec at idle).

Re: Any Idea what that noise is?
 

The ticking noise sounds sort of like an exhaust leak. Does it go away when it warms up?

Re: Any Idea what that noise is?
 

when my 90 was stock it made that noise 90-966, and when I put a different engine in it made the same noise.... 90-702 motor. There were some cam noise issues on 90s, I never figured it out on my car.... and it never showed knock.

Re: Any Idea what that noise is?
 

Noise also came and went w/weather...

Re: Any Idea what that noise is?
 

well I found my knock sensor plug melted still have to check if that may be part of it.

Re: Any Idea what that noise is?
 

Johnny, maybe it just as simple as this... --Bob

Re: Any Idea what that noise is?
 

**** I wish.

Lee mentioned a little thicker oil so I'm going to try that and see if it changes.

I needed to fix a rear main seal leak and that pan gasket as well so almost ready to fire it up. So we'll see.

Re: Any Idea what that noise is?
 

Totally different engine, but my L98 had a loose valve guide sound very similar to that clicking. I kept adjusting my rockers thinking one was loose.