Help me figure this out melted piston crowns who is to blame

[NashMan]

well i had an issue wiht my car with wich i had no control over


here is the story


car ran well for like 2 1/2 week's slowy bumping up the boost from 10 to for one week and 15 for the last week and half


did a leak down and it was perfect


whent on the dnyo did a pull t 15 pounds spun the rollers though out the hole range and recorded 535 woot

then went for a 24 pound pull and i saw my boost guage peg

but the dyno recorded 24 pounds once he cut it off after that run is persure the block and melted 4 pistons was over boosting

2 got ass fucked the other 3 had sticky upper ring that is all

last one just had sticky ring and sligh melt



pisont are je's that have bean coated coating came off as well


tunner saying he doe not under stand why they melt wiht a 11 ratio at max of 17 dagress of timing


what do you think happend


i runing water meth as well aem kit

can melt even wiht good a/r's

 

[GC89]

Sorry to hear about this Ryan, it looks like there is quite a bit of scuffing on the skirts of the two but it could just be the pics. I wouldn't suspect a lean condition at 11afr or detonation with that timing either.what meth mix were you running at the time?

 

[NashMan]

well i was runing bule winter mix window washer fuild I had jug of meth since i did not wana run washer fuild any more for the upper level of boost I wanted to run but tuner side don't bother..... grrrr


just one piston tuched the other would have but they ddin't just slight melt


to add to this I did not run a oil squrters and I ran a crank scaper

but there no burn/tranish on any of the under sides of the pistons


i going to be pulling my map off my car today

 

[shiftdrift]

Sure the wideband sensor is good?

 

[GrimJack]

Sure the wideband sensor is good?

Even if it is, it's still measuring an average across all 6 cylinders.

Something clearly got far too hot in there - overboost might cause that, but in such a short time period? On JE pistons that have been coated? Sounds fishy. Blue windshield washer fluid? Sounds like a weak link to me. I'd check the injectors too, especially the ones on the cylinders that failed miserably. You're not running Venom injectors, are you?

 

[Heavy D]

can this be of bad timing or wrong heat range on a spark plug? or bad octane level? just throwing some ideas

 

[Quin]

Meth injector might have laid down. Guy on ModFords just fried a built short block for the exact same reason.

 

[NashMan]

meth is working

8 heat range plug

injectors cheaked out fine



could be the window washer fulid but it was tune wiht it befor but stil did not wana run it any more

i have had teh case for 1 year and was stored in a cool place not in sun light at all

 

[soup]

to add to this I did not run a oil squrters and I ran a crank scaper

i asked you these a while ago, but don't remember and answers:
What's pulling the heat out of the pistons,
Which side are the oil ports on the piston,
What was the piston to wall clearance,
What's the ring gap?

I think those suckers heated up and the ridges on the crown caused it to go boom at the wrong time. I bet that scuffed piston had the tightest wall clearance. My two cents, but it's just speculation.

 

[Nick M]

Which side are the oil ports on the piston,
What was the piston to wall clearance,

So you noticed it also.

 

[NashMan]

I removed the squirters was going to any way notches or no notches

with in je's spec useing riches spec's


all bores are bored the same


number 2 failed bad

451 had slight meltage of the crown and the coatign came off coatign comes off

the coating will start to come off when the pistons hit 1400

 

[NashMan]

cleaned my head found this

pretty much knew what happen now

biggest question now is this head now junk ?

kinda bumbed right now since it will mot likly get replaced or all ground away and reweled

 

[tig321]

Is this the same head you already had repaired? I'd forget about another attempt at another fix. find good used head, that ones just going to do it again, don't you think?

 

[NashMan]

sadly that what most likly what will happen


such a fucken waste really

 

[funky_monkey58]

I want to see your timing map.

---------- Post added at 01:20 AM ---------- Previous post was at 01:14 AM ----------

I would also find a new tuner.

 

[NashMan]

it over boosted bad that what killed it


but i going to take a loook at my map when i can

 

[GrimJack]

I think Brad has an extra head, or will shortly...

 

[funky_monkey58]

it over boosted bad that what killed it


but i going to take a loook at my map when i can

If it overboosted the tuner should have already had a safety map with less timing and more fuel in those upper ranges just in case.

 

[NashMan]

ptwc is 0043 as well

 

[bloodasp90]

you think you can salavage everything off the head though?