09-22-2022, 07:09 PM | #799 | |
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09-22-2022, 08:20 PM | #800 |
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Sorry to be a noob but i am trying to understand. Are you suggesting that the dimensions of the pickup tube is limited oil flow of 2gal/min? Meaning that is the max that the engine is getting regardless how hard the oil is pumping? But if it's partially blocked, wouldn't that metric, 2gal/min be even lower?
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09-23-2022, 06:37 AM | #801 | |
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Last edited by _____That_-_GUY_____; 09-23-2022 at 06:48 AM. |
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09-23-2022, 07:22 AM | #802 | ||
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Subaru oil pump are unusual in the car world in that they have WAY more flow than is necessary 95% of the time. There are V8 engines that don't have nearly as much oil flow capacity as a Suby pump. They've always been this way, and yet, they have (by design) poor rod bearing oiling and marginal main oiling Here's a plot comparing the same pump with 2 shims added... Quote:
No, not at all. From our testing the pickup is very little of a restriction when you look at the system as a whole. Can you pick up a couple psi and small % of flow by installing a performance high flow version, sure you can. Anytime you reduce a restriction on a pump's inlet, it becomes more efficient. The systems flow limitations is really down to the engine's lubrication design: engine's clearances, and other things like AVCS, oil feed, etc... Those are all restrictive. The best way to improve oiling system performance is not by shimming or adding a bigger pump, it's rebuilding the engine with making modifications to the oiling system to improve its performance. One of the things we learned for example, is ALL engines (new used or otherwise) get a line bore (not a line hone). Once true, we actually close the main clearances below factory spec at ~.0007 +/-.0001. This smaller main clearance forces more oil to the rod bearings (the weak link). We've done this for stock engines running 0w20 to 760whp running 20w-60. We always run stock unshimmed pumps regardless or redline RPM or power level and have not had an oiling related failure in at least 10 years. |
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09-23-2022, 08:50 AM | #803 | |
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09-27-2022, 12:07 PM | #804 |
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From the sounds of all this, it looks like this is only going to impact a small subset of cars. (ones with enough of a clogging issue and while they're being driven at the limit)
Honestly my only concern at this point is if this happens to me after the warranty expires. |
09-27-2022, 01:17 PM | #805 | |
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09-27-2022, 01:30 PM | #806 | |
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Notice that the reports dropped off after the bulk of the cars got some miles on them?
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09-27-2022, 01:42 PM | #807 | |
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And some additional info, pretty sure he is a member on here. And some additional info that i came across, though cannot be verified as fact or BS.
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09-27-2022, 02:20 PM | #808 | |
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09-27-2022, 03:31 PM | #809 |
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How did you conclude on that?
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09-27-2022, 04:46 PM | #810 |
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The info that we have got right now says:
All happened with prior zero indication of a problem at a very low mileage. All the reports that gave details have said a single bearing went out. All oil samples from engines with no problems have come up good. Unless we get differing data the trend is glaring.
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09-27-2022, 06:26 PM | #811 | |
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09-27-2022, 06:53 PM | #812 | |
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If there was even one oil analysis that said "we have concerns" I may also change my outlook but there just isn't. Failure mode and risk analysis of industrial processes are what I have done for 30 years and I will say that with what we have I am about 75% confident that these failures are sudden. I would be happy to change that level (up or down) with a nice big data set but I don't think we are going to get much more info than we already have. Really the only new data I expect is if the mileages go up and there are still multiple failures but at this point they seem to have stopped. Or at least no longer get reported!
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