Piston melted hole in it

[trickedcarbine]

also found a pinched oring in cool head Antifreeze would also destroy the piston right

Ouch, Coolant is the anti lube in a cylinder, but it wouldn't cause a hole in the top of a piston. It is possible that it ate enough coolant from the system that the radiator didn't have enough fluid to properly cool the motor.

[hoppedupandcutdown]

OK, I'll ask...

 

So, you're saying that you did not do a leakdown test before or after, right?

And now it's apart?

[Deadbeat]

super rare boyesen ported banshee cyls yo

[bigweav81]

Probably just global warming.

 

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[registered user]

do you have photo of piston and plug ? im not so sure your problem had anything to do with being lean

[bigweav81]

do you have photo of piston and plug ? im not so sure your problem had anything to do with being lean

What are you thinking?

 

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[registered user]

never melted a hole myself but read a few things about preignition which is the phenomina that melts the hole. handful of events could of triggered the preignition. pinpointing it might be difficult since we know almost nothing of his engine. could of been to lean possibly. maybe a bad chamber design. who know what the comp ratio was. alof of people use +4 spark lead but maybe it was just a bit to much for the setup he had. said the oring failed, was that before or after shit went down hill. were the pipes old and full of carbon. what spark plug. you can see theres a lot of scenraios to sort through. im wondering if the other piston was near failure also or still looked brandnew. this might help decide what direction to look

Edited December 18, 2016 by registered user

[J-Madd]

never melted a hole myself but read a few things about preignition which is the phenomina that melts the hole. handful of events could of triggered the preignition. pinpointing it might be difficult since we know almost nothing of his engine. could of been to lean possibly. maybe a bad chamber design. who know what the comp ratio was. alof of people use +4 spark lead but maybe it was just a bit to much for the setup he had. said the oring failed, was that before or after shit went down hill. were the pipes old and full of carbon. what spark plug. you can see theres a lot of scenraios to sort through. im wondering if the other piston was near failure also or still looked brandnew. this might help decide what direction to look

Yep it's always difficult in this situation to tell if the cut oring caused the damage or was a RESULT of the damage. Anytime I've had a blown oring the top of piston and dome was trashed.