lmt0705

iTrader: (7)

I was at the track over the weekend and after the last couple of runs and on the ride home i noticed my oil pressure was lower than normal and when I cracked the throttle the pressure dropped. I changed the oil and cut the filter up and sure enough there were tons of copper shavings. I pulled the motor down and found that my thrust bearing and the one in front of it were fu--ing fried. the cap side of the bearing was actually cracked!! and they all looked like they were heated. the rod bearings looked decent and the motor dident make any noise. I was playing around with crankcase ventalation at the track. and my oil was 5/30 with around 3000 on it. did I boost the crankcase and lift all the oil? maybe I twisted the mains? Im running arp studs and the berrings were clevite 77s. the shops I talked to were puzzled that I had this problem at my horsepower level.

lmt0705

iTrader: (7)

the line bore was out .001-.0015 im still waiting to hear about the crank

WMSuperSport

iTrader: (23)

wow. keep us posted. who built the motor?

lmt0705

iTrader: (7)

i did, it had too many miles on it to be the build to be that I think, no one seems to have a straight answer for me

LS1curious

pictures of bearings and crank ?

Beaflag VonRathburg

iTrader: (176)

Sounds like an interesting problem. on the pictures.

lmt0705

iTrader: (7)

ill see what I can do, my machine shop has the bearings right now because they were all awe struck as well and wanted to ask around. anyone else have any ideas what happened?

Beaflag VonRathburg

iTrader: (176)

Improper torquing of the main bolts?

tahoe

I remeber reading a few threads about the same problem, fried thrust bearings.

I don´have the time now to do the search for yo, bu it´s here.

//

GOaT Cheese

If it were an A4 I would suggest inspecting the torque converter for "balooning".