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#1
March 15th 2010, 08:45
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I'm glad you have past this with the less cost effectiveness.
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#2
March 15th 2010, 14:28
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It is odd that 2 broke on the same cylinder.I´ve seen that happen on V8 cars that ran into the rev limiter on their burnout,it happened to my Mustang back in 1992.I broke 3 rocker arms due to valve float when I ran into the limiter (set it lower after that
 ),but they were all on different cylinders.Other than that,I would say that they just wore out and broke,stress cracking and fatigue. But very lucky indeed that it didn´t take a bunch of other parts with it!
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#4
March 17th 2010, 05:56
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Quote:
Mark, its not from 'worn out' reasons either as no wear is visible. Wear by definition should always be measurable/visible. Not likely either as they run on DLC treated rocker shafts... But I do also think pure metal fatique could be the most likely cause, probably combined or caused by a does of bad luck from coinciding ignition and/or fuel cut-outs all at once and overboost cut-outs during the tuning I did the days before. These are/can be rather violent. I have no other explanation as these original rockers are really considered as 'unbreakable' otherwise.
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