Happened at about 8300 rpm in 4th gear, looks like she went lean and egt's went through the roof, these are wiseco HD pistons. This was the number 4 piston...

The result was a melted piston

 

How lean did it get?

Fuel and boost level?

Sorry man, looks like that piston was looking for a way out the kitchen and came up short...

Scorke

 

Sorry to hear this....

Hopefully you will get her running better/stronger than before!

 

Faulty pump? Injector? Maybe weather related....good luck on the build.

 

Yeah it sucks man, I was on straight pump gas (93) boost was 29-30psi. The wideband is built into my AEM. I don't have a gauge at the moment, which was completely my fault.

**** happens, though this probably could have been prevented if I had the actual gauge and caught it in time.

 

Could have been, it was on a cold night its been in the twenty's and teens down here.

 

Thanks man, yeah at least I have a built to look forward too

 

Any other signs of excessive heat on the head or other pistons?

All the other exhaust valves are ok?

Do you know what sort of airfuels you were targetting?

First time doing these sorts of boost levels and RPMs or was this regular usage with irregular outcome?

INTERESTED!

Scorke

 

The other pistons actually looked fine, the afr's I was targeting were 11.2 mid range to 10.9 at redline.

Yes this was very regular with a irregular outcome, I really wonder if an injector failed. I need to test them..

 

yes, check the injectors man. I am really curious to see what happened!

The piston looks completely melted! Whats the melting point of forged aluminum? Thats crazy!

 

at least the piston didn't break apart and create an ugly mess....

 

At least the block still looks good. Might have to be bored though.

 

o nooo im sorry man keep your head up and build an even better beast

 

Yeah I gotta look on the positive side, the block is still good. I will deff have it bored I am hoping .20 over will get it.

 

That sucks. GL on the rebuild and finding the cause. Like everyone else is saying, least the block looks usable.