Sneaky Pete

I'm stepping in.......I think the bearing failure is a result of another cause. I think it was installed out of alignment. Look at the threaded stem the nut goes on....do you see how distorted the end of the stem is? Was it whacked into place? I also think the rear collision shook a bunch of debris loose......stepping out with food for thought.

Schnell Gelb

An interesting bearing issue has been lost.Lets get back to fixes ?
Whatever the cause of this bearing failure - would any particular bearing type have survived better than the single row deep groove ,ceramic hybrid shown in the photographs ?
Martin speculates that a cylindrical roller bearing is the solution without having identified the cause of the problem.
Unless we know the cause of the failure ,how can anyone recommend a specific bearing type ?
The misalignment issue is new(for me and many others it seems) in the IMSB saga .
The theoretical solution is a spherical bearing ,not a roller,not a deep groove ball. A plain,spherical bearing, or a ball-type spherical bearing maybe -like a CV joint.
Why measure for misalignment ? Just fit a spherical bearing !Ducking for cover !

Paul Waterloo

I have plans to retrofit a U-joint on my intermediate shaft, plus for good measure, I'm going to install an 8" Kingsbury thrust bearing.

Flat6 Innovations

If misalignment exists anything that's installed into the engine will operate in less than optimum conditions. If it's misaligned, then nothing will be anything more than a band aid that sooner or later will be compromised.

This misalignment issue is not new.

dporto

"The misalignment issue is new to the IMSB saga .
The theoretical solution is a spherical bearing ,not a roller,not a deep groove ball. A plain,spherical bearing"

I don't think "the misalignment issue" is new at all - it's just that Jake Raby only recently identified it as such (I think it's safe to say he's known about it for a while). As for "the theoretical solution" of the spherical bearing, I think Jake would take issue with that description as he recently received a patent for such a bearing. Just coincidently it's called "The Solution"

Flat6 Innovations

Nope, I just started talking about it.

dporto

"Nope, I just started talking about it."

That's exactly what I meant when I said

"I don't think "the misalignment issue" is new at all - it's just that Jake Raby only recently identified it as such (I think it's safe to say he's known about it for a while)"

DrMEMS

I just ran across notes from my mechanic while the old engine was still in the car. He read out the camshaft deviation at 1.69 degrees on bank 1 and 0.88 degree on bank 2, which are well within Porsche's spec of 6 degrees. He said that this meant that the IMS bearing was not installed crooked; it it were, the deviations would be a lot worse.

Schnell Gelb

Which leaves a manufacturing defect (like adverse cumulative tolerances) as the potential cause of shaft or bearing misalignment ?
If this is correct, changing to a roller bearing will not be a long term solution.
Spherical bearing maybe?

5CHN3LL

I propose an immediate adoption of Michell/Kingsbury fluid bearing retrofits. In addition to the bearing itself, it will be necessary to tow a compressor/gas generator to supply the necessary air pressure and volume, but otherwise this is foolproof. Note that some modification to PCV will be required to discharge the extra few hundred CFM of high-pressure air. Probably the motorsport AOS will work.

TSMacNeil

lol
I'm beginning to come around and see some of the logic in Jakes' thinking. I had no idea the engine cases could be machined with such inaccuracies. Hard to believe, but if true, explains so much about the unpredictability of these failures.
Still subscribed
- begs the question: can this machined misalignment be corrected?
That is my next question.

regarding "shock" and its' effects, while I may struggle translating it to a vehicular accident, this is where I live:

Flat6 Innovations

Incorrect. The cam deviations have nothing to do with a misaligned IMS and cannot be used to diagnose such a condition.

It takes considerable IMSB wear to show up as a cam deviation as well, and even then it will ONLY impact bank 1, as the end of the IMS thats supported by the IMSB only drives bank 1. I typically find cam deviations that are measurable well into Stage 3 IMSB failure; but, not before.
I do not agree with his statement, or theory at all.

The misalignment will not show cam deviations, because it is both very slight and also because the cam timing procedure and hydraulic chain tensioner will mask this.

The only way to find this slight misalignment (measured in thousandths of an inch") is by using a precision device that measures three different dimensions simultaneously giving an actual value.

A slight misalignment is HUGE to the IMSB as it places loads in a localized region of the inner race.

kab1994

In other news.....something about fingering the sump?

JD ARTHUR

I always enjoy Jakes replies as they are not theories but fact. Unless you think he is lying which is not his style.

Cuda911

OK, guys, not to steal any of the thunder from other inventors here, but I decided to tackle this one.

Took me nearly 10 minutes to design a frictionless magnetic flux bearing. No more oiling systems needed, no ball, roller, or other contact-type bearings, and you can whack the car from the rear, front, side all you want and it will remain perfectly centered.

I'm going to name it The Ultimate Solution. Is that name taken? I expect retail price to be approx. $19.95 if I can get the right Chinese fabricator.

You're welcome.

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