Unusual engine noise 1000-1500RPM

[krypto Avid PP Poster! Find all posts View Profile Close krypto]

Over the past month my engine has developed a strange noise between 1000-1500RPM. The noise is only present when the engine is hot.

Below is a link to a recording of the noise.

https://vocaroo.com/1beqgkWiyIjC

[krypto Avid PP Poster! Find all posts View Profile Close krypto]

Deleted

[amts Ninja Poster. Find all posts View Profile Close amts]

Could it be that it's not the engine but some other thing resonating - like a failed spotweld of a panel?
Can you feel a vibration with the noise?

[krypto Avid PP Poster! Find all posts View Profile Close krypto]

Could it be that it's not the engine but some other thing resonating - like a failed spotweld of a panel?
Can you feel a vibration with the noise?

I was thinking that but having trouble tracking down the source of the noise

[krypto Avid PP Poster! Find all posts View Profile Close krypto]

Could it be that it's not the engine but some other thing resonating - like a failed spotweld of a panel?
Can you feel a vibration with the noise?

Unfortunately not... really loud yesterday after a long drive up north, first thing this morning it was gone and came back when the engine heated up.

[krypto Avid PP Poster! Find all posts View Profile Close krypto]

For anyone coming across this with a similar problem. Turned out the noise is the Provent 200 Relief Valve fluttering. Solution is to stretch the Relief Valve spring a bit or get an upgraded heavy duty spring from Western Filters.

https://www.youtube.com/watch?v=9JBNG_Ac8wM

[Piggy Water pistol pilot. Find all posts View Profile Close Piggy]

Does the engine appear to have more blow by pressure now? That may have caused the valve to be "relieving"?

[krypto Avid PP Poster! Find all posts View Profile Close krypto]

It's a new engine (long motor), cracked piston It has used almost no oil in 10km, and no visible blow by. Best of all the oil was still gold coloured when I did the oil change (EGR blank and catch-can).

Seems this is a common problem and there is a stronger spring available which I have ordered.