Nasty Noise! What is it?

[newsh]

Nasty noise on the Amethyst Avant.

I've got a bad feeling about this.

It's not there at idle, nice and quiet. Only happens at small throttle openings around 2000 rpm, accelerating gently between 2 and 3000 rpm is worst.

First noticed it a couple of days ago pulling away from home. Today it's worse.

Not using oil AFAIK. Otherwise running quite nicely.

I don't need this Video below.

[piotr]

It don't sound to good :-( is it louder from the top or bottom of the engine?if it is top i would take rocker cover off and look for damage there.

[spink]

I can't see the video due to poor net atm but what you describe sounds exactly like just before martins s4 shat itself.It was a worn main bearing

[europeanme]

your right that doesn't sound good at all....sounds to me like something in the head as apposed to bottom end....noisy lifter or possibly something stuck in a valve..

[piotr]

Yes.this is what it sound like to me.valves/springs area

[newsh]

Using a long screwdriver as a stethoscope, it's not in the cam cover, definitely lower down. I can hear it quite loud in the block under the water manifold.. I think it's spun a bearing

[newsh]

But oil pressure is good

[RoadKill]

my dads 10v made that sound was a worn out valve guide

[macspring]

Unfortunately it doesn't sound like it's gonna cure itself.

Wouldn't be inclined to drive it.



Thanks for sharing the video / audio clip.

Looking forward to seeing what it turns out to be.



My money is on a bearing of some kind.

[spink]

I think it was actually a worn rod bearing on the s4, crank and rod were totally paggered

I've heard the noise now and its almost identical

[newsh]

Yes

[SteveH]

I would guess Rod bearing from the sound. Deffo not a driver while it's like that unfortunately!

[AndyP]

Good grief, have you run over a gypsy recently?? Your luck's been shocking

[Bowie69]

Was gonna say, isn't that number 4?

Is it definitely mechanical and not a cracking from the exhaust manifold?

[newsh]

Yes it's definitely mechanical,

Yes, it's number 4