Well since this was brought to me pretty much in this condition, it's all supposition. The crank is toast. The rod bearings aren't quite as bad but trashed, none the less.Scott, are you saying this thing had ample oil pressure but no filtering caused this damage? Either a long time running the same oil, high horsepower application (which I expect given the camshaft type and profile) or something introduced into the crankcase oil that sped up the process of destruction. Can we assume the rods were as bad or worse?
Did something finally fail or did he shut it down when the engine noise surpasses the header noise?
If they are loose enough to see that in a pic, why are they that loose. and please try to explain it without use the term DETONATION! Wags just could deal with that right now.Ding ding! We have a winner!sphss
It was a stock GM forged unit, which did indeed sacrafice itself to the cause.Is the crank worth saving- if so how does it look?
Did a mega unobtanium crank demolish itself to save the inexpensive bearings?
Bores dont look trashed.
Cam looks like it might have worn down a lobe.
Well detonation (or just severe pounding from excessive power...not in this case, though) is the only thing I know of that will do that to a main bearing. Now why it was detonating, I don't know...I wasn't there, but I have a feeling it was a combination of timing by ear and about 12lbs of boost. I also don't know what the original clearances were, but my guess is there wasn't much room for any "trouble", if ya know what I mean.If they are loose enough to see that in a pic, why are they that loose. and please try to explain it without use the term DETONATION! Wags just could deal with that right now.
AAAAH Bullshit!Liesl):ameRealityhilhilhilmy only conclusion is detonation...big time. The detonation curled
At least that's my take on it.
I think you raise an interesting point that the bearings didn't spin, because it was a perfect candidate for it, but that addresses the heat issue. It never got hot enough for a bearing to "grab". There's really no sign of heat in the bearings, but that's not to say they didn't get hot.Ive never taken anything apart that had the size gap between the bearing and the saddle/seat, but then again Ive also never seen anything that beat up before.
I take it this isnt normal at all no matter the age or condition.
I lost an oil pump pickup once and idled home pulled the engine and checked the bearings out and they all sat perfectly flat and the bearing was uniform in color so I bolted it all up and it was fine for another 200 hours (except I killed the valve guides and didn't know it.)
sounds like it was caused by beating a dead horse to long. Im surprised the bearings didnt spin around in the seats.
Thanks for the picts- fun stuff.