My conclusion: tell me if I’m wrong
Just finishe the post mortem on my 3.2 engine that blew all to hell at the track. It seems pretty clear what happened and I think I know why. New video:
https://youtu.be/IrJl2uHrzaY |
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Yep, oil starvation is the most common reason for an m96 track driven motor to scatter parts. High G left sweeper followed by a deep braking zone, and/or downshift over-rev cavitating the oil pickup.. Bye bye!
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It is assumed that the connecting rod bolts stretch by continuous high rpm's (metal fatigue perhaps..?) |
Interesting that your Mantis Sport deep sump kit 2 wasn't enough to prevent starvation, maybe it was rod bolt stretch?
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I think that the problem was not caused by insufficient oil from the sump but rather blocked oil passages. I mention this in my previous video about the engine swap. See around minute 11:30. Threads of orange silicone sealant may have made their way into those little channels and holes that lubricate the crank. The extreme heat weakened the bolts and bang! :eek:
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Great videos, thanks for posting them. |
Thanks for posting. You make it not so intimidating. I learned a bunch.
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Clogged oil passages is another possibility especially if someone was *liberal* with sealant when replacing the pan or adding a deep sump. If that was the cause you could probably fish the oil passages and find it. Another telltale sign is the oil pickup screen completely jammed with excess sealant. |
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[QUOTE=Topless;595182][B]The fastest way to stretch rod bolts? Downshift over rev. Zing it past redline heel/toe with no load on the motor a few times while entering a corner and rod bolts become stressed/stretched.
This is the only reason I put aftermarket R&R rods in my rebuilt engine. |
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