new engine spun rod

[ove_98 TSI]

so this is what happened. rebuilt engine with all oem parts. start engine everything is fine i let idle for about 30 mins everything is good. next day i let idle for about 45 mins, then i take it around the block not going into boost. i get about 10 miles on it then i decide to boost some i wanted to have boost set at 10 psi, because of not having injectors. it goes steady to about 8-9 then just takes off to about 24psi. so i figured my profec was set to high i lower it to 0 (which is supposed to be wastegate spring boost) and it does the same thing right up to 24psi again. i begin to drive home to see if i have a stuck wastgate when i hear a slight ticking by the time im home (1/4 mile) it becomes a knock. i pulled the oil pan off and this is what i found

oil psi was at 30 at idle and about 90-100 when reving
afr were reading lean on my wideband

cyl #1 is flawless

#2 was getting no oil it was dry not a drop of oil on it, and the bearings were stacked

#3 has plety of oil but is scrached badly

#4 is scracthed lightly but also plety of oil

what went wrong? i want to avoid this on my next rebuild or possibly on my new block and crank if this one is damaged to bad

 

[nate379]

I usually fire an engine, do a 20-30 min break-in... New oil and a filter and run that for 500 miles... then it's good from there.

 

[freeman 188]

my motor was done with the green plastic gauge and showed 0.003 which was for a race engine or daily driver ,10000 miles and still running . if it was at the service limit then you should have gotten another crank or had it undersized .

 

[ove_98 TSI]

i do belive i know the problem, the main bearings were installed in reverse. The bearing with the two holes and grooved, i had on the cap assembly that holds the crank. i just glad i know what went wrong so i can learn from my mistakes

and does anyone know how much a crank micro polish is?

 

[webconnect]

the main bearings were installed in reverse.

That will definitely do it. Don't feel bad. My buddies and I installed my crank in backwards. (Yes, it does bolt up. Only until you try to spin it by hand it then it jams.). This is a learning experience!
I had my crank cut .10 under for 75$

 

[garputo2]

Just happened to me if you did the balance shaft removal and the bearings were not offset this will happen or if the oil galleys were clogged

 

[donniekak]

Please clean everything this time. I've never seen a rebuilt engine with so much oil sludge in my life.