Atleast your honest bill...i was thinking lean detonation on the piston and messed up head

Dustin

 

I wasn't. Not with forged pistons. Thats the insurance you buy with them.

 

My experience is limited, I have seen pistons like those ^ on my Harley when I was running too much CR...a few times :-(

What is the fix?

 

Like I said the 2618 pistons don't break, they deform...


I'm with Ky, What was the piston to cylinder clearance set at?

 

depends on how deep, but the fix is not good, I think the cheapest of which would be a new block and one new piston....

 

Yeah sorry Chris. This is the worst you would expect to see with the cylinder wall damage.

 

so it kinda looks like something seized...or well started to!

Dustin

 

I would check clearances. The more I look at the pictures IMO, considering a top notch builder, I think the dang plug electrode caused all this. Broke off. Powdered up a bit, few bigger pieces got down into the rings, screwed them up and they rolled over. A nice piston ring, electrode sand paper.

 

I have no idea what the clearances were...I'll have to check with Rex on that one. What would cause the tip of the spark plug to break off?

 

oh man, that sucks the big fat one....so sorry buddy, you barely had time to even play with it which makes it that much worse.