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YOUR RESEARCHAre 996s with LN Retrofit essentially ?safe? from IMS failure?....
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It was a bit tainted as the car had been rear ended, and after they inspected the motor after failure, the bearing was actually fine, and the shaft had been the real culprit.
Are 996s with LN Retrofit essentially ?safe? from IMS failure?....
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Leading evidence: 'Inspect motor' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Check /' (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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IMSB is always a concern unless replaced with the Solution.
Are 996s with LN Retrofit essentially ?safe? from IMS failure?....
Use oil fed plain bearings
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The turbo and earlier air cooled engines, along with the 9A1 and newer engines produced since 2009, all used oil fed plain bearings.
Are 996s with LN Retrofit essentially ?safe? from IMS failure?....
Use on either bank
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I know the IMS shaft allows the use of a single head design that can be used on either bank.
Are 996s with LN Retrofit essentially ?safe? from IMS failure?....
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Are 996s with LN Retrofit essentially ?safe? from IMS failure?....
Inspect motor
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It was a bit tainted as the car had been rear ended, and after they inspected the motor after failure, the bearing was actually fine, and the shaft had been the real culprit.
Are 996s with LN Retrofit essentially ?safe? from IMS failure?....
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Looking a a couple of 996s with the LN Retrofit, both with 30k miles after the retrofit was done (same time as new clutch for both) Can I assume IMS failure should not be concern?
Well, I'm a total newby to the Porsche world and probably not at all qualified to comment. I just purchased a 996/911 and did a sick amount of research before making my purchase. I had the LN Retrofit bearing done when I purchased my car. The current bearing was just fine, and probably would not have had any issues. I thought the replacement was good insurance. From the research I had done, I could only find one documented LN Retrofit failure. It was a bit tainted as the car had been rear ended, and after they inspected the motor after failure, the bearing was actually fine, and the shaft had been the real culprit. I'm hoping for 100K out of mine. The originals were sealed. The LN Retrofit sits right in the oil and is constantly bathed. I don't think you could say with 100% confidence that any IMS bearing would be essentially "safe".
Kyle
A year and a half ago I looked at the decision to install the retrofit or the solution. I found the retrofit to have significantly more installations with zero failures. Seemed like a no brainer to go with the retrofit which had years of additional real world trial over the solution (at the time). Now I sleep fine at night knowing the IMS issue has been completely addressed for the life of my car. Don't know if that helps.
It�s safe enough. Meaning that you are doing just about all you can and the rest is out of your control.
LN bearings don�t really fail, but you can still have any number of other issues.
If I had an LN bearing, I would be able to sleep at night knowing I did the �right� thing. If you wanted a true bulletproof fix, buy a Turbo. Next best thing is a Jake Raby build. Both are much more expensive. So for the price, LN bearing is the way to go.
The Solution is a plain bearing conversion. Plain bearings are what�s in your rods and crank. They won�t really wear out as long as they get good oil pressure and don�t get too hot. It costs more money to have The Solution done, but it basically 100% solves the IMSB problem.
there are literally so many ways that an engine can go belly up. To be considered safe is kind of amusing. I had the bearing installed and while the bearing was okay even after the engine blew up, the rest of the engine cracked like an eggshell. Crank broke, rods broke in half, cylinder walls had chunks missing.
She died doing what she loved. On track, being hustled like she was meant to.
There is no use spending . your life worrying about what could be. Enjoy the car. It's a mass produced machine. I laugh at all the people stowing away their GT3s in the garage never to see the light of a upper rev range. SMH
Now looking for an engine for its rise from the ashes......
The solution is a plain bearing with an oil feed off a flange between the engine case and oil filter. The LN bearing is an upgraded roller bearing similar to the bearings the were originally installed. The turbo and earlier air cooled engines, along with the 9A1 and newer engines produced since 2009, all used oil fed plain bearings. The solution kit is more expensive than the roller bearing replacement kits.
I would recommend checking the install date (or mfg date if not registered) to determine the recommended service interval for the bearing used.
http://www.imsretrofit.com/ims-check/
If an IMS Solution was installed, there is no service interval as it's permanent and there are no moving parts to fail.
I did not know that. I know the IMS shaft allows the use of a single head design that can be used on either bank. I assume then that the 9A1 has bank specific heads.
There is an IMS Solution website for more information. I decided to go with the IMS Solution. I said screw it, I don't want to have to worry over it anymore. Got the clutch, RMS, and AOS changed out when the transaxle was removed. Save myself a lot of future labor costs.
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