Audi a8 d2 2.5 tdi 132kw knocking nose AFTER CAM REPLACEMENT

[milenajdoski]

Hello ther
1 month ago i replaced the whole head issues new camshafts new valvle lifters timing belt .... the whole thing.
The car starts on 1st pulls nice no smoke all seems ok.
When cold and untill it reaches temp.no noise but after it passes 60 degrees i can hear knocking sound.
Suspected on not good guality valve lifters oppened the whole thing again ang changed all 24 to new INA lifters.
Same thing again when cold no noise at all.when warms up the noise is when reving between 1200-1800 rpm.on over 2000 rpm it is eather lost or i cannot hear it.
If keept at 2500 rpm for 2 minutes it is silencing but after a while the noise comes back again
Logicaly the oil retain valves dont hold enough oil up there.but if so why on start and while cold it is so da.n quite?

Any idea guys

Btw it pulls realy good, no smoke not at all even at full trottle.

Please????