Broke my forged crank in half..... pics inside
04-18-2009, 09:19 AM
#61
Negative, I most certainly have you beat. My engine blew chunks out of the block and oil pan when I went to start it. It never even started. I just stuck the key in, turned it, and clunk, clunk, boom it blew. I also victim of the most random ownage via SSU and my old teacher.
04-20-2009, 07:41 AM
#64
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Actually the crank probably broke, then the pin lost its oil. Also it is possible for the crank to still spin, even though it snapped (because the main bearings hold it together), so it obviously cooked itself on shut down atleast.
Another point is that the location of this failure is at the highest stressed portion of the crank, its near the flywheel. 100% of the torque from the engine goes through Pin 4! So it took a beating and we found the weak link in the Pin 4 fillet.
Another point is that the location of this failure is at the highest stressed portion of the crank, its near the flywheel. 100% of the torque from the engine goes through Pin 4! So it took a beating and we found the weak link in the Pin 4 fillet.
04-20-2009, 09:12 AM
#65
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Actually the crank probably broke, then the pin lost its oil. Also it is possible for the crank to still spin, even though it snapped (because the main bearings hold it together), so it obviously cooked itself on shut down atleast.
Another point is that the location of this failure is at the highest stressed portion of the crank, its near the flywheel. 100% of the torque from the engine goes through Pin 4! So it took a beating and we found the weak link in the Pin 4 fillet.
Another point is that the location of this failure is at the highest stressed portion of the crank, its near the flywheel. 100% of the torque from the engine goes through Pin 4! So it took a beating and we found the weak link in the Pin 4 fillet.
the failure is not towards the back of the motor, its right in the front. Cylidners 1 and 2 are the ones that are free floating the crank.
the more i think about this the more i realize how lucky i got... the timing chain is attached to the part of crank that broke off.... which means i could have smacked some valves VERY easily, especially with my fairly large cam.
