11-01-2010, 01:44 PM
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#1
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Registered User
Join Date: Jul 2005
Location: MA
Posts: 884
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OUCH! Looks like a rod bolt.
My guess is that the bolt somehow worked its way loose, gnashed the timing, and the material in the cylinder is from valve contact.
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98 Arena Red 986
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11-01-2010, 01:50 PM
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#2
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Engine Surgeon
Join Date: Aug 2008
Location: Cleveland GA USA
Posts: 2,425
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The material in the cylinder, is the cylinder... After the rod bolt stretched, worked its way loose and fell into the sump where it was picked up by the timing chain..
The remaining single rod bolt wasn't enough to tie the mass together, so it broke and shot the cap through the top of the block. When the rod became disconnected it acted much like an axe and chopped through the bottom of the cylinder.
.......and some people are REUSING the stock rod bolts!
__________________
Jake Raby/www.flat6innovations.com
IMS Solution/ Faultless Tool Inventor
US Patent 8,992,089 &
US Patent 9,416,697
Developer of The IMS Retrofit Procedure- M96/ M97 Specialist
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11-01-2010, 02:08 PM
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#3
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Registered User
Join Date: Apr 2010
Location: trenton nj
Posts: 449
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are you saying this motor ran for a time [it would take some time for the bolt to back out] with one con rod bolt
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11-01-2010, 02:35 PM
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#4
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Engine Surgeon
Join Date: Aug 2008
Location: Cleveland GA USA
Posts: 2,425
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Quote:
Originally Posted by extanker
are you saying this motor ran for a time [it would take some time for the bolt to back out] with one con rod bolt
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Yes... And its not the first time we have seen this.. I have seen an engine run fine with one rod bolt shot through the top of the case! It was taken to a dealership and they didn't know what the bolt was or where it was from!
The engine ran like this for a good while, until the remaining bolt snapped from seeing double the normal load as it was trying to retain the rod cap all by it's self.
Look closely, the bolt in the picture never broke. Its also not stripped.. It literally fell out during engine operation.
.....and people wonder why the only engines I'll warranty are ours with full upgrades!
__________________
Jake Raby/www.flat6innovations.com
IMS Solution/ Faultless Tool Inventor
US Patent 8,992,089 &
US Patent 9,416,697
Developer of The IMS Retrofit Procedure- M96/ M97 Specialist
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11-01-2010, 04:14 PM
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#5
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Registered User
Join Date: Aug 2005
Location: Sanford NC
Posts: 2,582
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I think Porsche should charge Jake
for the entertainment value they provide ... so many puzzles and weird failure modes for him to marvel over.
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11-01-2010, 04:55 PM
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#6
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Engine Surgeon
Join Date: Aug 2008
Location: Cleveland GA USA
Posts: 2,425
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Quote:
Originally Posted by mikefocke
for the entertainment value they provide ... so many puzzles and weird failure modes for him to marvel over.
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My trophy shelf of blown up parts sure does grow quick! What took me 20 years to accumulate with aircooled failures I'll have far exceeded with the M96 in less than half that time!
I've never seen so much carnage from driving the speed limit!
__________________
Jake Raby/www.flat6innovations.com
IMS Solution/ Faultless Tool Inventor
US Patent 8,992,089 &
US Patent 9,416,697
Developer of The IMS Retrofit Procedure- M96/ M97 Specialist
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11-02-2010, 07:14 AM
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#7
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Engine Surgeon
Join Date: Aug 2008
Location: Cleveland GA USA
Posts: 2,425
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We finished the autopsy.. The entire bottom end of the engine was garbage..
AWESOME! Now to induct these onto the trophy shelf as offerings to the Gods of speed!
__________________
Jake Raby/www.flat6innovations.com
IMS Solution/ Faultless Tool Inventor
US Patent 8,992,089 &
US Patent 9,416,697
Developer of The IMS Retrofit Procedure- M96/ M97 Specialist
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11-01-2010, 04:20 PM
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#8
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Registered User
Join Date: Jun 2008
Location: Illinois
Posts: 147
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Quote:
Originally Posted by Jake Raby
Yes... And its not the first time we have seen this.. I have seen an engine run fine with one rod bolt shot through the top of the case! It was taken to a dealership and they didn't know what the bolt was or where it was from!
The engine ran like this for a good while, until the remaining bolt snapped from seeing double the normal load as it was trying to retain the rod cap all by it's self.
Look closely, the bolt in the picture never broke. Its also not stripped.. It literally fell out during engine operation.
.....and people wonder why the only engines I'll warranty are ours with full upgrades!
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Just like the '06 Cayman the local dealership dived into. The rod bolts were finger tight! Probably would have suffered the same fate if driven any longer.
__________________
Charles Navarro
President, LN Engineering and Bilt Racing Service
http://www.LNengineering.com
Home of Nickies, IMS Retrofit, and IMS Solution
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