Burnt up another piston and cylinder

[casper1981]

Im still not quite on board with the whole lean detonation. Why doesnt the piston just sieze before a hole gets burnt through the piston? Is this only possible in an air cooled engine? Im guessing the heat transfer to the cylinder with out water cooling alows the cylinder to expand enough to continue running until the engine starts to detonate. Am I on the right track here?

 

[99LRDblaster]

Im still not quite on board with the whole lean detonation. Why doesnt the piston just sieze before a hole gets burnt through the piston? Is this only possible in an air cooled engine? Im guessing the heat transfer to the cylinder with out water cooling alows the cylinder to expand enough to continue running until the engine starts to detonate. Am I on the right track here?

Rings can seize, but it's unlikely. Ring seizure is typically more prevalent in lack of lubrication and sudden seizing.......such as an oil injector failure at high RPMs. In reality, it takes A LOT for rings to seizure inside a sleeve......and I mean a real lot. People mistakenly correlate "seizure" to the crank not turning when it's either damage to the crank or a foreign entity causing friction in the cylinder to piston. Actual seizure is only possible under EXTREMELY hot and poorly lubricated circumstances where the ring and piston begins to degrade to the point where it melts to the sleeve. Predetonation is quite easy on the other hand. Hot spots on piston crowns, glowing ground straps, etc. cause extreme amounts of force to be put on the crown of the piston as it is reaching TDC blasting away the aluminium crown and it just gets easier as the heat rises until a hole is through the crown.

 

[brandoz28]

i've seen this happen in claimer style dirt motors, extended rpm and lean jetting=holes in pistons