Quote:
Originally Posted by bishopts
Maybe the failure is low flow in the crank oil channel? I don't know the flow path but if its going from front to back then you could lose pressure toward the back as each journal is bleeding off some of the volume.
If it's fed from the ends and the center then maybe you have a restriction in the rear oil feed channel to the last main cap.
Maybe the last journals bearing lock broke off and the spun bearing blocked the oil feed.
If you have no signs of oil pressure loss then trying to overbuild you oil pressure system isn't going to fix anything.
If you want to overbuild it for fun. Just remember whatever took it down before can do it again.
Normal oil pressure is about 40ish. The stock pump can put out 75psi. So really if you just changed the tune for the oil pressure limits you can get higher than stock pressure by simply telling the pcm to stop throttling oil pressure.
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I can tell you the specifics on my engine, and one of the others. Seems like both spun the rod bearings on 7/8. My engine also spun the #4 mains but they just swapped places, not a complete failure, the crank journal for the 7/8 rods also cracked, and the engine still ran before I pulled it out. The other one had the rods break on 7 and 8 and the bearings spin.
My theory is that maybe there was some aeration in the oil and even without a noticeable drop in pressure you still have insufficient lubrication. This is my theory based on absolutely no research into that specifically. If it was an anomaly that these engines fail it'd be a very different approach for me, but it's not, and they do fail. And a dry sump is better than a wet sump, and that's not really debatable. There's a reason no race team chooses a wet sump and it's not only about mounting the engine lower.