Why make us wait to buy a book from you in 2014 as we are all needing help and advice for this problem right now. Surely you are well aware 2014 may be too late for us. Why don't you fill us in in as this is a forum thats here for help when needed

Thought this was a good one to share. Seems like the world is coming to an end when Porsche engine quality is being overshadowed by Ford

Ford makes the best engine in the world? Germans get shocked in viral video - NY Daily News

Yes Mobil1. And yes I agree. I just bought it in july so it's not much I can do about the past.

Polk, I can understand why Jake would not want to get into an online debate as to which technology is better. It would be unseemly and ultimately, unproductive. He has been and continues to be a tremendous contributor to this site - no doubt taking time away from work at his shop that would be much more profitable. Secondly, many of us are looking forward to the release of his book - and again, we can hardly expect him to have spent so much time and effort preparing a limited-market publication without some expectation of compensation. Do you really expect that he should give it and its contents away? If you had been a member of this site for monthis, let alone years, you would no doubt appreciate how generous Jake has been in answering the questions of various members - giving up some of his substantial expertise for free.

Brad

I just want to know if this new solution is better than his? Or explain why oil is not just flying out of his bearings he sells like a food blender in perdo's video. Forgive me but I am a new observer and having to decide what to stick in my new car.

Now that response is just way over the line. If you expect Jake and Pedro to get in to a *issing match over the subject I'd say you are sadly mistaken. This is one of those moments where you should step up to the plate, do your own research, make your own choices, and live with them.

This is a straight line I expect you'll get enough comments on what to stick in your car that I'm not going to touch it.

It's a free country, man. If he chooses to not to share, we shouldn't ridicule him. However, if there is a negative effect for his action or lack of his action, his reputation is at stake.

send a sample to these guys. Maybe they an give you some clarity on what's going on in there.

Blackstone Labs

It's my understanding that the DOF complimented the LNE Retrofit, matter of fact I thought the LNE Retrofit came with the DOF until yesterday.

Relative to the LNE and DOF, how did Porsche correct the issue in the new (post 2009) engines?

In the latest engines, Porsche eliminated the IMS - no IMS, no IMS bearing to worry about.

Brad

Yeah. Lets see how that works out. We've been inside the 09 and later engines for over 3.5 years now.

A Porsche overhead cam engine has utilized an "IMS (aka layshaft) since the mid 1950s, beginning with the 547/1 and that was done for a reason.

The DOF is indeed a compliment to the IMS bearing (any bearing).
You can install a DOF on your existing LNE ceramic bearing, or you can opt to purchase an IMS Kit (steel-ball or ceramic-ball) if you want to replace the OEM bearing when you install the DOF.
Again, none of the bearings on the market are the issue. They're all fine and can handle the task.
The reason why the fail is because of improper lubrication which is what the DOF addresses.
Happy Boxstering,
Pedro

I'm just tossing this question out there for anyone, but is the IMS the only part in the m96 that is prone to oil starvation?

How is the bearing-free IMS Solution different from the bearing-free redesign in the 9A1 "solution"?

Jake,

Yupper! Only time will tell w/ the IMS-less. However, simplicity in engineering is always the best ingredient for a successful product.

Southernstar is correct with his statement; there's no argument about that. If I understand your implication/statement correctly, then no body is questioning the decision that porsche made to use the IMS b/t the crank and cams but many people are questioning the use of the roller bearing on the IMS. When a highly sought after company changes the design of their engine drastically, deleting IMS, their confidence in previous engine design is questionable. I'm not saying it's a problem, but it's extremely questionable.

Prior to 1996 when the Boxster came out, what type of bearings did they use for the IMS?

Oil starvation does not explain why the IMS failure rate of a sealed single row IMS bearing is 7 percentage points higher than its dual row counterpart rate of nearly 1%. The more likely reason is that single row bearings are weaker than dual row ones and, as such, they cannot carry IMS dynamic and thrust loads as well. This reason also explains why IMS bearings last longer in cars that run at higher RPMs - the drive it like you stole it ones. BTW: replacing the OEM bearing with a ceramic one fixes the loading problem.

Oil starvation also does not explain the roughly 1% failure rate common to all sealed IMS bearings. The most likely reason all IMS bearings suffer this baseline failure rate is leaking seals compromise lubrication by allowing oil to mix with grease. The resulting mixture provides much less lubrication to ball bearing and race surfaces than grease alone or oil alone. This reason also explains why IMS bearings last longer in cars that lessen the chance of seal degradation by changing oil often. BTW: installing an unsealed bearing or removing the seal on a currently installed bearings cures the compromised oil problem.

Oil starvation may explain potentially different failure rates in unsealed IMS bearing cars that use different methods of delivering oil to bearing assemblies. But first, it’s important to know if the failure rates of the two methods are actually different. The answer will come only when many unsealed IMS bearing cars with different of maintenance and driving histories amass a reasonably high number of service miles - say at least 50,000 on average. Until then, people must rely on seller opinions and the track records of their products. Both sellers claim their products are great. The LN Retrofit has a track record of almost no failures over several years. DOF is just beginning to build its track record.

So grab a few drinks and some popcorn and sit back and watch the debate as it unfolds over the next few years. Eventually, real world experiences will settle the relative failure rate question among the competing lubrication methods for unsealed IMS bearings.

On air cooled 911 it is a lapped bearing with an insert to support the rear journal.

From what I've read and analyzed in the last several years, nobody understand why there's a problem with the IMS bearing. I mean, no body!

There are many speculations but nobody can prove why it happened!!!! I have not seen any scientific test done to it, not even close!!!!

Do you know why they change it to roller bearing? is it because of assembly issue?