I need some words of wisdom

[swrbansheeboy]

looks like you were building excessive heat on the right piston and got it just hot enough to warp the piston crown but didnt blow a hole in it, maybe due to low compression so it didnt build enough compression to blow the crown out.

 

it's obvious that the tollerances were a bit less than desirable causing quite a bit of piston slap which is probably what caused the skirt to crack. your actualy pretty lucky you didnt end up stuffing a bunch of molten aluminum through the bottom end or busting the skirt off and grinding it up.

 

as to why it happen i cant tell you, usualy detonation effects both cylinders but if your compression was off a bit then it would effect one cylinder more than the other. could be an air leak on the intake, usualy crank seals effect the left side not the right. coolant leaks can cause detonation but usualy you wind up with one piston that looks cleaner than the other...what you have there is kinda odd imo.

 

and yea, thats a stock clutch basket and pressure plate..

[bassmaster345]

Thanks for the reply's. Finally got the bottom end tore apart and case split,aside from the clutch being trash the rest looks to be in good shape. I noticed all the way around the bottom of the cylinder opening in the case that the edge has small cuts in it. I also found some engraveing on the case just above the crank that had XQ 96, anyone ever seen this before?

I guess it's time to get it all cleaned up and ready for some new parts. Looks like I will be going back together with the 4mill long rod setup.