Ok, I have decided to get a qualified mechanic to do a full inspection on my engine.
Basically this is what happened, the connecting rod broke and the piston spun 90 degrees clockwise. The piston hit one of the valves because the valve relief has moved (because of the 90 degrees piston spin). The shreaded rod has punched 2 holes on the block causing oil leak, and engine stalled.
The mechanics have proved that this was happened during low rpm driving. At low rpm, only 1 of the intake valve will be fully opened, the other valve will only be half opened. Both valves will only fully open when VTEC is engaged. The fact that only 1 valve has been damaged proved that it was happened before VTEC is engaged.
They have proved that this is not caused by over-revving the engine or mis-shift because there wasn't any damage in the valvetrain and there no signs of overheating as well. In fact, the valvetrain appears to be in near new condition, which has ruled out the chances that it is caused by excessive wear or poor lubrication. They came to the conclusion that this is caused by manufacturer's defect.
I have already paid for the repair and inspections myself. Basically Honda has denied my warranty claim because they said it can't happen just like that at 3000rpm. They said I must have over-revved the engine or mis-shift. They said they will need to charge me for the inspection, it can range from a few hundred dollars to a few thousand dollars, and he said it will cost me $12000 to fully repair the engine. I was freaked out by the price and I have decided to tow my car away to get someone else to repair it. This is my experience with Honda, is there anything I can do to recover my loss? I'm frustrated and I don't know what to do. btw, my car is 19 months old and it has done 43000km.
Here's some photos of the open engine:
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