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11-05-2012, 04:23 PM
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#1 |
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Registered User
 
Join Date: Jul 2008
Location: auburn ma
Posts: 216
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8.1 , broke piston , help , ideas??? Pics inside. This is not your average thread!=)
OK ... Need some 8.1 help here. I am far from a guru and dont claim i know everything... but my number 5 cyl is down on compression.... =) number number one is broke and number 7 is cracked.... has anybody ever seen anything like this before?"?? have a bent pushrod in #5 but im sure has to do with vanishing piston trick. question to you guys is... im tossing another motor in this car and i dont want to have same issues... this motor was in a bread truck and was tmu. One more question... does anybody know if gm stamps the pistons from the factory like that" or someone rehash this thing???? ??? sorry for the ramble ... THANKS FOR ANY HELP!!!!
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11-05-2012, 04:23 PM
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#2 |
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Registered User
Join Date: Jul 2008
Location: auburn ma
Posts: 216
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Re: 8.1 , broke piston , help , ideas??? Pics inside. This is not your average thread
Top rh of 2 other pistons are cracked.
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11-05-2012, 04:24 PM
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#3 |
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Registered User
Join Date: Jul 2008
Location: auburn ma
Posts: 216
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Re: 8.1 , broke piston , help , ideas??? Pics inside. This is not your average thread
More
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11-05-2012, 04:37 PM
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#4 |
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Registered User
Join Date: Nov 2009
Location: maine
Posts: 2,315
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Re: 8.1 , broke piston , help , ideas??? Pics inside. This is not your average thread
wow, last one i saw like that the guy missed a gear and she saw 7k rpm then BANG! Are you stuffing another 8.1 in the car? The guys around here won't buy a truck with one in them, they hate them for some reason.
edit: I should clarify, its wasn't an LS motor that blew up, just was using it as a reference to the last one i saw blown up.
__________________
1972 C10 Deluxe.Shortbed. 402/400. A/C, white interior, needs complete restore. Project Red, white and blue. Used to be a Longbed apperently. http://67-72chevytrucks.com/vboard/s...d.php?t=451950 1971 c10 step 250 3 OTT 1969 c30 TOW-MATER. 307 4 speed, holmes 440 body. http://67-72chevytrucks.com/vboard/s...d.php?t=451082 2006 CTS-V LS2 6spd. |
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11-05-2012, 04:59 PM
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#5 | |
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Registered User
Join Date: Jul 2008
Location: auburn ma
Posts: 216
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Re: 8.1 , broke piston , help , ideas??? Pics inside. This is not your average thread
Quote:
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11-05-2012, 09:19 PM
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#6 |
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Senior Member
Join Date: May 2009
Location: Fort Worth, TX
Posts: 6,370
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Re: 8.1 , broke piston , help , ideas??? Pics inside. This is not your average thread
Use Forged Pistons!
Looks like piston fatique, Not common on a N/A engine. |
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