I have a new noise that has developed... and I am slightly stumped currently. Noise starts occurring towards the end of the clip and it sounds exactly like that in person. Audible inside the car clearly.
It only happens under load - in the video it is in drive with handbrake on and another foot hard on the brake. So it isn't UJs, or anything post autobox output.
It starts about mid throttle and between 2-3k. It might persist higher in the rev range but I've been driving sensibly to avoid having two cars off the road. It is there approx 50% of the time too. Lift off and it stops immediately.
It is NOT the belt or any ancillary - it persists with the belt off. I wish it was.
Engine hot or cold.
It appeared to be worse on gas than petrol, but I think that is placebo as it happens on either fuel.
It appears to be on the RH/drivers side, but as with a lot of noises it sounds like it could be underneath, to that side, or on top. But, its definitely further away than the LH/passenger side.
In neutral/park however - gone. Revs up and down sounding lovely.
The most annoying thing about this particular irksome noise, is I am sure I had exactly the same thing with the first engine on my first P38... and I never got to the bottom of it. I'm pretty sure that was 'solved' when it had a replacement engine dropped in. It also had a set of headers already on it. I can't see any evidence of a leak from the little you can see with heat shields in place.
Anybody come across this before?