joppe

Eagle rods, acl race bearings, std size, engine is built 2011 and has about 15K miles on it, including drag and circuit racing. 340Whp on E85, 15w-60 ester based race oil (i used redline 10w-40 before but pressure dropped to 45psi at hot)

Worst bearings were on 3rd. one rod bearing and main bearings was ok. Engine was plastigauged at build and clearance was 0.04-0.045mm. Engine had some misfire at high boost, and im wondering can it break bearings like this or is this lubrication problem?

wantboost

iTrader: (2)

Those bearings look like they lost oiling and cooked themselves to death.

joppe

ACL race bearings are kind of black at new? Rods didnt have any discolor.

1HGEJ2

iTrader: (1)

how much rpm did u use? modified oil pump?

SpokaneSpeed

Definitely looks like lack of oil lubrication by looking at the bearings...

What oil pressure were you normally seeing at operating temp @ idle?

joppe

About 20psi. Oil pump is ported, rev limit 7800. Even with this failure it had 15+psi at idle

DDTECH

clearances ?

TheToaster

iTrader: (1)

Knock wore them away and then spun them, once spun, they wear.

SpokaneSpeed

Read the OP ;-)