I was running with knock for hundreds of miles before it let go,(oil level was topped off) I was suprised to hear that BOTH driver side rods broke... after reading that there's a filter before the turbo it makes me suspicious that shop is upselling me. First inspection of the turbo was fine on the exhaust side.1) Two rod failures points toward oiling problems. Not for sure, since one bearing being damaged (not necessarily "spun") could have put enough babbitt into the oil that the second bearing suffered, but I would still bet on a failed oil pump, failed/stuck open oil pump bypass valve, or just plain low oil level.
2) Re the turbo, an ounce of data trumps a pound of theory. Why don't you take a look at the thing and see if it spins OK or not? That will tell you a lot. And, yes, a bunch of babbitt in the oil could have messed up the turbo bearing oil flow as well.
3) Cut open the oil filter and see what you have. That will be educational, at least, if not useful in further diagnosis. If there is metal, a magnet will tell you whether it is babbitt or not.
What do you think about $5100 in parts alone for a OEM STi shortblock ?The turbo has a bearing in it that if dry will make shavings. What happens elsewhere is beside the fact.
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Oooo .... Bad idea. But you know that now.I was running with knock for hundreds of miles
Now that you explain, I'm not surprised at all.before it let go,(oil level was topped off) I was suprised to hear that BOTH driver side rods broke ...
My tuner didn't mention this, thanks!Oooo .... Bad idea. But you know that now.
What that knock was doing was pounding babbitt material out of the big-end bearing and putting it into the oil. As someone previously mentioned that may have been enough to clog the filter and cause the filter bypass valve to open. Game over at that point: Then (still guessing a bit) the oil galley to the second rod bearing may have gotten clogged and the rest is history.
Now that you explain, I'm not surprised at all.
Good on you that the turbo is OK. Be very careful, though. Whatever oil passages there are in the turbo itself will have to be very carefully cleaned with brushes, flushed with parts washing fluid, and inspected by a raving paranoid. This may well entail tearing the thing down.
Yes my local mechanic said that he has driven cars with knock for a year or so, granted he said that was about 10k a year.Hundreds of miles with fried bearings? Man, yeah it's completely possible in that length of time the particulate are up the turbo.
Usually with a dead bearing they last hundreds of seconds.
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