Thanks for your responses everyone. Just to be clear, I'm just looking to compile possible causes, I know there's no way to tell if the chicken came before the egg here. It's just something I hadn't seen mentioned here before so I thought a thread about it would be a good idea.
Quote:
Originally Posted by Ultramaroon
Perhaps over-torque of the crankshaft pulley screw started the crack and it grew until catastrophic failure. What are those marks on the end of the crank?
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This is what the tech at VEMS was thinking-that someone pounded the crank pulley on. What's funny is what when I removed the crank pulley after all this, it came off without even using a breaker bar, but that's likely because of the trauma. I'll be able to head there on Monday, I plan to get better photos from further away.
I am thinking that a rocker came off, upset the whole thing and caused a lot of damage in the 15 seconds it took me to get back to my driveway. This used engine they gave me had a strange noise I had believed to be the timing chain between 1600 and 2100 rpm, I would hear it on decel and on accel every time I passed through that RPM range with load on the car.