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  #361  
Old March 14th 2010, 23:52
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You are very lucky Wally! Glad that's the only damage done.
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  #362  
Old March 15th 2010, 08:17
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Wow ! I'm glad there was no other significant damage to your engine ! That is a very puzzling break for sure.

Sandeep
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  #363  
Old 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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  #364  
Old March 15th 2010, 14:28
70Turbobug 70Turbobug is offline
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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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  #365  
Old March 17th 2010, 03:49
Clatter Clatter is offline
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It's just too coincidental that they are both on the same hole side by side...

Detonation?

Evil Detonation, specifically?
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  #366  
Old March 17th 2010, 05:56
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Quote:
Originally Posted by Clatter View Post
It's just too coincidental that they are both on the same hole side by side...

Detonation?

Evil Detonation, specifically?
No, its not from detonation, that I know for sure as I had the vid running showing the knock sensor not sensing knock when it happend.

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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  #367  
Old March 19th 2010, 00:18
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Hi

I'm no metallurgist, could you take them to maybe a local aeronautical engineer and ask their opinion.

Steve
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  #368  
Old March 19th 2010, 01:42
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I've done a bit of failure analysis in the past, doubtful I could tell from photos but if you post closeups of both sides (broken side) I can at least take a look.

-Dave
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  #369  
Old March 19th 2010, 14:38
vwdreaming vwdreaming is offline
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something 4 the trophy shelf
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  #370  
Old March 19th 2010, 16:15
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Quote:
Originally Posted by owdlvr View Post
I've done a bit of failure analysis in the past, doubtful I could tell from photos but if you post closeups of both sides (broken side) I can at least take a look.

-Dave
Difficult to photograph so up close. This is the best I could do:




Yeah, the trophy shelf has another exibit for sure..

Last edited by Wally; March 19th 2010 at 16:27.
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  #371  
Old April 17th 2010, 16:15
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After replacing the two rockers by another set of used rockers , the engine ran flawless again yesterday on the Ring.









Also put some video up of the day on a vimeo account:
http://www.vimeo.com/user3613136/videos
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  #372  
Old April 17th 2010, 17:48
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what a GREAT video and some nice driving too
keep it up man
Chris
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  #373  
Old April 17th 2010, 17:56
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Well, not so sure about the driving, but you can really check out the place this way and it shows what a great wheather we had!
Vimeo has an upload limit....so I'll try to upload some other footage onto my y-tube account:
www.youtube.com/user/fusca03
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  #374  
Old April 18th 2010, 23:10
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I just read through your whole build and your car is just AWESOME..
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  #375  
Old April 19th 2010, 07:48
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amazing pictures again wally looks like you;re havin great fun with the car!
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