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THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
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YOUR RESEARCHMy conclusion: tell me if I’m wrong - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Reported or suspected cause
caused by lack of oil lubrication
Reported cause
No successful repair reported for this finding.
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Reported cause
So, it sounds like the core problem was caused by lack of oil lubrication.
My conclusion: tell me if I’m wrong - 986 Forum - The Community for Porsche Boxster & Cayman Owners
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Leading evidence: 'caused by lack of oil lubrication' (1 discussions report identifying this cause; no attributable repair resolution). Across 1 matching discussions, the most frequently mentioned possible cause is 'caused by lack of oil lubrication' (1 discussions; 1 report identifying it and 0 suggest it). The most frequently discussed action is 'Lubricate crank' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
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Suggestion · Original poster
Threads of orange silicone sealant may have made their way into those little channels and holes that lubricate the crank.
My conclusion: tell me if I’m wrong - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Replace pan or adding a deep sump
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Suggestion
Clogged oil passages is another possibility especially if someone was *liberal* with sealant when replacing the pan or adding a deep sump.
My conclusion: tell me if I’m wrong - 986 Forum - The Community for Porsche Boxster & Cayman Owners
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12 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
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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
That's a very interesting analysis and breakdown of various layers of the engine. So, it sounds like the core problem was caused by lack of oil lubrication.
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!
Also, another related failure could be caused when the con rod bolts stretch, which leads to a spinning bearing, loss of oil pressure...
It is assumed that the connecting rod bolts stretch by continuous high rpm's (metal fatigue perhaps..?)
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!
I was wondering about that; blockage rather than an issue with a high G turn. Brad Roberts posted some data a while back that led me to believe that the high G starvation issue is not as relevant to the Boxsters as it is to the rear engine models. I may have misunderstood though.
Great videos, thanks for posting them.
The fastest way to stretch rod bolts? Downshift over rev. Zing it past redline during heel/toe with no load on the motor a few times while entering a corner and rod bolts become stressed/stretched.
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.
Possibly guilty of the first situation but definitely guilty of the latter. Many orange snakes found in the pickup screen and one can assume that there were smaller pieces that squeaked by! Did I mention how stingy I was with a better sealant on the new install?
[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.
This is a source reference. Confirm exact model applicability in the original material.
