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The 20% figure
has been posted on the net before. There has never been any scientific basis for it.
Recall that Porsche went through 3 different designs of the IMS trying for a reliable one before they eliminated it so it isn't fair to say they did nothing till they eliminated it.
20% of any make's engines will fail given enough time and miles. So the interesting figure to me is how many failures per year of driving.
If 400 LN IMSR kits have been sold per year against 200k cars on the road, that is a small number. Considering that some of those kits replace good bearings, some replace about-to-fail bearings, and some go into engines because another engine fails or the engine is being rebuilt...the number is pretty small on an actual failures per car per year basis. I don't know how many engines Porsche rebuilds a year but since the inventory has been said to be in the teens, can't be too many. Add in engines reused from totaled cars. And parted out cars.
And consider many of the cars failed for a different reasons...said to be 21 or 22 of them. And are never opened up so they get lumped into the "must be IMS" pile.
We obsess too much...because we love em.
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