Piston break?
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Senior User
Joined: Sep 2007
Posts: 193
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From: Rexburg ID
Piston break?
#7 piston looks like it cracked and blew apart. first I noticed blowby, then all of a sudden 'clunk', and it died @ low rpm. turns out the piston was in little tiny pieces, and the rod got wedged against a large chunk of piston, sending it into the water jacket.
Why would a piston break when all the others are totally fine.
Could this be blamed on flawed piston? (no, I'm not trying to get this warrantied)
background: 130K ish miles on stock bottom end. cruising when I noticed blowby, putting when it went 'clunk'. 3 weeks earlier used 70% methanol in water/meth injection at the 1/4 mi drags with no noticable side effects (at the time). I run 49% or less most of the time with no problem. one guy I know tells me the 70% is what caused it. Not sure what to believe, since I know of guys who run that rich on a regular basis.
If nothing else it was a good excuse to do more mods on a new bottom end.
Why would a piston break when all the others are totally fine.
Could this be blamed on flawed piston? (no, I'm not trying to get this warrantied)
background: 130K ish miles on stock bottom end. cruising when I noticed blowby, putting when it went 'clunk'. 3 weeks earlier used 70% methanol in water/meth injection at the 1/4 mi drags with no noticable side effects (at the time). I run 49% or less most of the time with no problem. one guy I know tells me the 70% is what caused it. Not sure what to believe, since I know of guys who run that rich on a regular basis.
If nothing else it was a good excuse to do more mods on a new bottom end.
