which ims bearing upgrade
Ok guys, so ive finally decided to do the bearing upgrade on my base 986 1999 model. My only problem now is deciding which one to go with. Any of you guys have any experience of the different solutions out there. Eternal fix seems to be getting more and more popular,my concern is that its only a single row,and although they offer a spacer for the dual row, I dont know if it would be a good idea to go to a single row,from my present double row. Then there's the DOF system from pedro, which ironically he suggests using a steel bearing as opposed to LN's ceramic version. Then of course I could go with just LN's ceramic upgrade without additional oil supply. My heart says DOF,but I'm sure no expert. Any suggestions greatly appreciated,thanks. Btw,since ill be changing my clutch, should I go with a performance clutch? I dont track the car,i like some hard driving,but some people say that clutch pedal might become harder, so I'm guessing maybe not too good for street driving?
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If the car has its original engine, it is a dual row. I would unequivocally recommend the LN dual row bearing without any oil feed system over the other options you mentioned, based upon years of experience install ingthem; they simply work and do not fail.
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[QUOTE=JFP in PA;471881]If the car has its original engine, it is a dual row. I would unequivocally recommend the LN dual row bearing without any oil feed system over the other options you mentioned, based upon years of experience install ingthem; they simply work and do not fail.[/
As far as I know they still need looking at after certain miles,no? Are there any of their bearings that have ever failed or not? How about LN's bearings with dof? Just asking |
[QUOTE=boxster;471894]
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LN has never had a dual row unit fail to my knowledge, and the handful of single rows that failed were traced to improper installation techniques. The LN bearing does not need an oil feed, oil mist inside the crankcase is more than enough lubrication, as demonstrated by nearly 20K successful installations. The DOF ads unnecessary complications and has been known to introduce other problems. |
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[QUOTE=boxster;471899]
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The bearing is immersed in oil when the car is sitting level with the engine off. Change the oil frequently, use good oil, and when you are ready to change the clutch you can worry about the IMS again. As a garage queen, how long will it take for the car to reach 75k more miles? Will you even still have the car then?
JFP, first time I've seen the 75k figure. Where did it come from? Last time I talked to Charles it was his thinking it was even more. It may be he is just being conservative again? |
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[QUOTE=JFP in PA;471915]
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[QUOTE=boxster;471921]
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The demand for the dual row version of the IMS Solution was finally great enough to make a run of them to be distributed.
Yes, we have been installing them here at Flat 6 for a while now. The site still says they are not available, because they are not outside my facility, YET. Distributors are still getting the pieces in their systems, and they should start getting units into inventory by summer 2016. The ONLY reason the dual row version was not produced, was demand from distributors who felt the older cars would not be worth the expense. After 3 years of IMS Solution sales, that changed, and the distributors started asking for the units, because they had more demand for it. Newer owners of the older cars have been the driving force behind this. BTW- All Classic single row IMSBs from LN are a 50K mile product. The Classic Dual row, and the single row pro (dual row that fits in the single row shaft) are both 75K mile items. The IMS Solution has a lifetime expectancy, as it has only one moving component, eliminating at least 11 other wear components from the IMSB. |
If the OP (boxster) has any reservations regarding the LN dual row ceramic upgrade, I fitted mine way back in 2010 - I must have been one of the first in Australia to take the plunge. While not cheap (about $3,500 at the time).
I had past experience with ceramic bearings in large (1.2Mw) electric motors which, with their standard SKF steel ball / roller bearings, were giving temperature overheating problems under continuous heavy loads. We did a lot of investigative experiments with various lubricants and bearing combinations but finally decided on ceramic's. The overheating and wear (brinelling) never occurred again. As far as I am concerned, you cannot go wrong with the LN ceramics.... |
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No - one of the ceramic bearing's biggest attributes is that it requires only a small amount of lubrication (the individual balls are as hard as he knockers of hell) & certainly the oil mist caused by the rotating masses of timing chains, crankshaft, cams etc. is enough. Actually, too much oil can cause "skidding" of the balls in the race.
Don't overwork this - as JFP and Raby say, keep good quality, clean oil in your engine and you wont have to worry about bearing failure. Just make sure the person who installs the new assembly in Malta is experienced in the LN IMS installation procedures..... |
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I had the dual row in my '99 Boxster changed in 2012 and it has 32K miles on it. I read up on the bearing before having it installed and what was being advertised, at that time, was a recommended change at 50K miles. The statistics, though, indicated ceramic bearings outlasted steel by a 5:1 ratio. What I've never understood, or found an answer for, is what is the starting point for the ratio of 5:1? If my OEM bearing had 84K miles on it and was still in good shape does that mean 420K miles? If it is 5:1 what do I need to change the LN at 50K? Perhaps someone can explain the reasoning.
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