The engine was checked by specialist engine machinists but they are 150KM's away so can't get them to hear it although they admit theres probably not much point. , engine was meticulously rebiult, lots of time spent preparing all main components block heads crank etc by steam cleaning including oil cap rocker covers manifolds dip stick dip stick tube you name it we cleaned it.. small brushes through all oil and water gallerys , crank block etc making sure everything was spotless, bearing tolerance to specs checked everything corecttly lucbricated etc etc we were cautious about a speck of anything getting intot he engine... We spent over half a day cleaning the already realtively clean parts we got from being machined, then 2 days tro put the engine together, you can wack an engine togtehr I guess but we checked all tolerances and cleaned/chased all key threads after so much effort etc its why I am a bit Mildly miffed and stumped at what the issue is...
Not the first engine I have rebiult first to have this issue though.
Oil pressure 4.5 x 100 bar at start up moving to about ,.8 when hot 94C at idle fitted external VDO oil pressure guage.
So oil has been no problem new oil gears although it really didnt need them and all parts from Turner engineering i.e pistons, ALL bearings valve lifters, rockers camshact etc etc... nothing cheap used on this far from it and EVERYTHING replaced.
I also had a proffessional mechanic helping who has biult a number of engines. The bores were not so oval or worn as to require anything mnore than a 2 thou hone so why rebore , the liner issues were largekly resolved by the changes made to these later so long as the liners were fitted correctly and mine were checked. I thoughyt it was a long shot asking here as everyone inoloved professsioanlly with the motor trade hasnt been much more help except to say strip it down and identiify the issue anything else is a guess.
Not to keen on thicker oil in a new tight motor although it may get away with it. I run the same oil in my other LR V8 and it the LR specced oil here...so cant be that.
We will try an tie the noise to a cylinder by doing some spark testing matched to noise then check top an bottem end of that cylinder which will give us the issue.
thanks anyway.
Happy New year