Justin (bangetek) 1996 UrS6

[JustinB_20vt]

Fresh paint!

[ringbearer]

Looks great, lots more pics please!

[JustinB_20vt]

Great day out at #noflyzonearizona today Videos and damage assessment coming but i melted a plug and have zero compression in cyl #3 ... I have a log of the event but my laptop is doing greater things this weekend

[chaloux]

Awwweee man. Were you participating in the event or just watching? Valve is my guess if 0 compression... But you likely have many smarter brains there to pick than mine

Surely someone has a leak down tester! Hah

[loxxrider]

I assume this was on corn?

[JustinB_20vt]

I assume this was on corn?

Yes 88% tested before the event ... most of the time around here its down in the high 70's so that may have contributed to my problem

[loxxrider]

Man, something is going on with these cars and e85. There have been so many fuel related failures lately, and the only common denominators are usually VEMS, some kind of ev14 injectors, and e85.

Give your in line filters a check and take a look down into the top of injector 3 and see what you find.

Sent from my SM-N910V using Tapatalk

[JustinB_20vt]

I don't think its an injector ... i had a misfire earlier in the day and started to melt a plug for #4. I changed all my plugs, pulled the boost down to spring pressure was runing .85 lambda.. hooked the N75 back up with lowered PWM values and ran a 1/2 and my lambda was .85 to .83 hank had said there may have been to much timing so im thinking the long pulls in 4th and 5th with aggressive timing were what did it in. Gonna remove the turbo today and do a quick leakdown into that cyl

[A20V200]

Nice Justin....sucks about burning up a plug and possibly more....!
How was the NOFLY event as a whole?
Any pics of the event?

[loxxrider]

Good to have the details of why you think the failure happened. Thanks!

[JustinB_20vt]

Whelp theres your problem!... Looks like i will need a new head and some pistons :

[SEStone]

Pictures blocked :(

[A20V200]

Dood...that sucks. Cant see the damage pics are blocked.

[PRY4SNO]

Same.

[JustinB_20vt]

Should be fixed now... they went into the wrong album

[loxxrider]

Looks like det on the piston no? I thought this wasn't possible on e85 according to some around here.

Or is that just from the valve pieces? Probably that.

[JustinB_20vt]

It's definately detonation but mostly the head material stuck to the piston... also the exhaust side of the piston is out of shape

[Marc]

for the most part, e85 doesn't detonate. what I see here is high EGT. When running on alcohol fuels you rely pretty heavily on the latent heat of vaporization properties to help cool the chamber. exceed the capacity of the fuel charge to cool the chamber, run too high of post intercooler temperatures, or run a bit lean and EGTs can get to the melty zone. check the adjacent cylinders as well and make sure everything is still round.

[chaloux]

I was going to say egt as well based on where all the material ended up. Usually if it's pre-ignition it will end up that the piston around the intake valve pockets will eat shit, but this is all on the exhaust side. I was actually going to say back pressure at first but went back and read that Justin is using a Hank manifold (but I didn't see what ar the hotside is).

Do you have any of the runs logged, Justin?

[JustinB_20vt]

Looks like oil in the intake track may have also played a part as my catch can overfilled and dumped back into the intake track. It also appears that the intercooler may not be getting enough air with the new front bumper. IAT was a bit elevated and so was EGT esp for run 4.

Run 4 was the one where "bad" happened.

[popdemonic]

i got this 3 out of 5 with E85 tuned but running on E20 gas.I'm doubt if this's Pre-Ign.

[JustinB_20vt]

Well the block is out. time to start tearing it down

[chaloux]

In the above picture, is that carbon flakes or indents in the piston?

[JustinB_20vt]

Pop's picture? They are indents from detonation.

[chaloux]

Oh I didn't even realize that it wasn't your picture. Reading comprehension ftw