So.......only one piston bad........bad inj causing the problem?

 

Holy dude! How's the cylinder look

 

more carnage....

 

well i cranked the motor over with a ratchet today and found that all the pistons move freely, but i can't keep cranking the engine over, when the burned up piston hits tdc the engine locks up and i can't keep turning the engine over, it does it if i crank the engine forwards or backwards. when the burned up piston hits tdc it just wont go any further??? any suggestions or thoughts on this would be appreciated. oh yah and the valves from the burned up piston, they are warped

 

The melted aluminum probably just solidified at the top of the bore...you'll likely have to chip away at it and then hone that cylinder. I'll venture a guess that you may find some crosshatching under all that mess---always the optimist If that's the case, hone it out, put in a stock size piston and RUN IT

 

but why do you think the piston would have gotten that hot? and turned into liquid metal, because it is all up inside the exhaust port, i can scrape it out fairly easily, but im still confused as to why that piston turned into a molten mess.

 

I don't claim to be an expert in any of this, rather, I'm drawing mostly from what I've learned on these boards. Having said that, there are a few things that may have contributed to the death of your piston. Running the 6bta at 100% duty cycle while in a BOMBED state is enough to put things into meltdown mode. Where a simple late-popping injector might never have caused a problem on a 160hp engine, it will most definitely push the envelope, and quickly, when the fuel is cranked. If timing is advanced, the pyro may read the average of all 6 holes as being acceptable, but the late-popper will be sitting there at 1500 and, well, you know what happens next. This is the first/most likely example that comes to mind, and I use it just to illustrate how one hole can burn down by iteslf.

 

now that you mention that, it sounds quite possible, since i didn't find any water in the oil and the piston is melted and doesn't show signs of burnig water which would result from a cracked head or block. i now what a piston looks like after trying to burn water, my moms ford had a warped head and the #1 cylinder started taking in water, when my dad pulled the head you could see the difference between the pistons, the piston that was burnig water was super clean, almost looked new!

 

after thinking about what g1625s said, it makes sense. my truck seemed to be running much hotter than usual for about a week and a half before this happened, but the long 3hr trip to the beach must have caused the piston to get hot enough and liquify itself since on the way back i was doing about 80mph up and down hill , hmmmm. well hopefully the block is still good

 

65fury!

just a thought about how to clean up the melted piston out of the bore!!!!!

the snowmobile guys that lean there fuel out to much(make them faster....for a short time!) and melts there piston to the syliner wall, us some sort of acid that disolves the alu. but will not touch the steal bore!

i will ask my snowmobile buddy monday what type of acid it is. maybe you could put a big hug glob of grease on top of the piston...... like you or worried about that piston!