Quote:
Originally Posted by Perfectlap
so why do the former? does this special shaft prevent other types of failure?
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As PJQ mentioned, the triple bearing shaft existed prior to the "Solution" and had proven to be very strong. These were being used, albeit in small numbers, by those that were doing a total rebuild and wanted the best available. The triple row shaft also has pinned end sprockets, which eliminate any chance of the sprocket coming loose or moving, which does happen from time to time and cannot be addressed with the shaft in the motor during a retrofit. While Jake developed and perfected his "Solution" system, the existing dual row LN ceramics were proving to be pretty bullet proof, so he only designed the Solution for the single row engines, which were always the most problematic of the bunch. The Solution also addressed the concerns over having to replace the single row ceramic bearings periodically, but does it at a higher price tag. the triple row shaft can also be used in any M96/97 engine, regardless of what style it came with, because the triple is a compete shaft and bearing assembly; and by 2005-2006, the only replacement shaft (if you needed one) that you could get from Porsche was their "final solution" big bearing shaft, which has proved to be susceptible to the same style of failure as the units it replaced.
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