Originally Posted by
frsjon
first thing id check is the exhaust manifold and turbo for any blows as this can sound like tappets,then id have the sump off for a closer inspection . first id check the con rod bolts are tight and then the bearings .. did you personally check the little ends when it was built? bore clearances? whats the oil pressure like? as this is a blacktop have the tappets been shimmed correctly?
Manifold and turbo are fine as is the tappet clearances. That's the next thing I'm gonna do and if I can't see anything then I will take the lump out and get it sent off.
I never checked the little ends or clearances of bores. I left that all to the engine builders. Also the oil pressure is great. 80 on cold start with a little rev, 35/40 on idle.
I'm hoping someone here has an idea as to what the sound is familiar to. Its very uniform unlike a rattle. And I took a plug lead off each cylinder and it didn't quiet down. I poured oil down the bores to see if it queited down in the case of piston slap but no different.
I've tried a few things :/