Rebuilding my motor, broken piston ring?

[XTCshri2222]

Pulled the piston out and found the ring was broken, luckly the cylinder walls were left unscaved, but what would cause something like that?

[boost_boy]

Pulled the piston out and found the ring was broken, luckly the cylinder walls were left unscaved, but what would cause something like that?

Pay close attention to the piston. I don't think you broke a ring, but a piston instead. And that is caused by detonation or overly advanced timing, too much boost and not enough of a supporting engine managememt system to support the boost you're running.

Dee

[float_6969]

As Dee said, it's probabally caused by detonation, the cause of the detonation can vary widely, but is genrally caused by too much advance, not enough fuel, or excessive intake air temperature.

[Swedish Mike]

+1 here, they normally break when the piston compress of high cylinder pressure (detonations).

/Mike

[boost_boy]

Pulled the piston out and found the ring was broken, luckly the cylinder walls were left unscaved, but what would cause something like that?

Dude, I got to post some photos of some busted pistons of mine from the previous 7 years:



The one on the left is a wiseco piston. It doesn't matter what piston you go out and buy, if your pushing your system past it's limit, BLAAAAAM!

Dee

[XTCshri2222]

i've kept the boost down, and been running rich, babied it. was pretty advanced for a while be fixed it to 15degrees. i do have fuel managment on there, but since tearing open the motor looks like the previous owner beat on this thing, there signs of flooted valves on the cams and lifters.

[XTCshri2222]

Dude, I got to post some photos of some busted pistons of mine from the previous 7 years:



The one on the left is a wiseco piston. It doesn't matter what piston you go out and buy, if your pushing your system past it's limit, BLAAAAAM!

Dee

outch thats painfull

[float_6969]

Still not as good as the piston that I pulled out of my 2.4L in my old Ford Tempo. The engine caught fire and I melted the #4 piston IN HALF. ( I mean that in every sense of the term)

[boost_boy]

Still not as good as the piston that I pulled out of my 2.4L in my old Ford Tempo. The engine caught fire and I melted the #4 piston IN HALF. ( I mean that in every sense of the term)

Yeah, well I got a GA16i that came out of a car I purchased and that thing tore two rods from the crankshaft, through the block, and then wedge itself between the downpipe and the cross member and the car was stock/auto. Don't talk about the piston (piston what?)

Dee