Youre typing is one thing.....rods and pass side of motor is showing another thing

Lean with alot of timing melts pistons....thats a broke piston

Pistons look steam cleaned, as for running meth i have a set ran with meth and have more carbon then those showed

Now youre all defensive for whatever reason but end result is you guys posted up a hurt motor with signs of more then ran lean

Also meth it should be tuned so incase you run out of meth its still safe now unless your making up for fuel system with the Meth....Julio will educate ya or anyone what afr you shoot for on meth...its 10.8 11.0 just incase this **** happens

And for him to stay in throttle and never see the light came on...wtf


Dunno how you boys do it but i dont run around on the streets for no reason with my kill tune

As for AI 243s familar with them as car i tuned has them on them and make solid power, similar to WCCH 243s

 

I'm not being defensive. I'm explainimg exactly what's up with the truck to the best of my knowledge. His target lambda generally is .75 so it's right in that ball park pf what Julio and others recommend. Frankly, after the dual pumps it was still fatter than that for The exact reason you mentioned... It wasn't the 'kill tune'. The last data log I have had WOT In the mid 10's. Clearly not enough to save it from a meth kit not coming on. Maybe for a short period, but not a prolonged one. Not to mention IAT's aren't his friend and the meth helps with that a lot. It was kind of a double whammy.

Unless Kurt can post up something that says otherwise, I haven't seen any signs of pushing water. No water in the oil, nor oil in the water. There is also never anythjng wet or a smell of coolant after a hard run

I didn't post up to make it sound like you aren't familiar with the AI heads, but to remind you te dofference between his engine and travis' engine. We see the boost we see, the difference lies in a massive difference in the top end and 18ci. It's not to say we're so smart we did it with 6# less boost. It just is what it is... It's a maxxed D1. On a 390ci motor with even better heads someone could run a better time on only 10psi.

I wouldn't imagone it takes very long to steam clean the Pistons when running it hard... If there was in fact water that was pushed it must have all happened in the last run. You gotta remember this failure didn't stop the truck from running. He let out of it, rolled to a stop, listed to it knock for a second and shut her down. He didn't know it was knocking until he let out, there wasn't a bang that made him let out.

Again im not being defensive, but I'm trying to explain why most of what you're thinking isn't necessarily correct. Maybe I read it wrong, but it seemed like you were calling into question total Boost, total timing, and the target fuel ratio. I was just trying to explain how the truck is tuned to run and what the logs have shown.

As far as timing and the tune, 17* IMO is absolutely appropriate for the fuel he was running (93 and meth). On 93 alone even the "kill tune" would have looked drastically different, that I can agree whole heartedly with.

And to him leaving it buried with out meth coming on... I had the same reaction. Face in Palm. I think the new LED for the second fuel pump threw him off? No idea.

 

So 10.5 afr ?

Also if went lean on the meth and you feel that is wjat killed pistons then the plugs would be tore up and you stated they were fine


When you lift a head oil and coolant dont mix...it lifts and settles right back down and remains normal...look for signs of drips down side of block, look for burn marks on surfaces

Also for a motor to be "fat" and have those clean pistons...that is steam cleaned

Also for his tune to be fat and as i was pointing wirh rods being smaller the afr will be fatter since not burning properly


I bent 4 rods but not as bad as that and 2 of plugs were cold as no heat from not firing. I still have those rods on display and they were meth...youll see carbon, and i pushed that motor hard...26.3* timing on 12.5 psi and 18psi with 18* on meth
Never pushed a drop never got hot but motor was 9.0 with .028/.028 gap rings


To bust the piston like that isnt lean


Hows his steam vents

 

The plug change was before the motor popped... i haven't seen them since the carnage. I'd bet just as you mention they're torn up pretty good. Time will tell i guess. It was only to say that every indication before this happened with meth functioning properly was that things were safe.

When its dialed in for the track the target AFR is 11.0 or a touch leaner. On the street yes it was 10.5ish before this catastrophe.

We never saw any signs of the head lifting... smell of coolant or anything being wet. Of course it could have been missed. Here's a question... how common is it with these weaker rods that you lift a head fastened with studs before you bend a rod? Most of what I had heard was a bent rod with the earlier motors was more likely to happen first.

My take was that running lean led to much more heat and ultimately detonation... the cyl pressure from there could very likely cause problems like this as well as a lifted head. It's also worth noting that his heads are milled slightly... possibly making them more prone to lifting? Not sure. Could the head lifting on this last run clean the pistons, or do you think it was a prolonged issue?

This motor is drastically different than what you had been playing with from the sounds of it. climbing to 14PSI at shift points with 10.6 compression and stock ring gaps I still feel confident that 17* is safe in this case(with meth in the equation... without it not even close). Hell I was running that much boost at 3500 RPM and through peak TQ and my stock motor would have taken that timing as well. I think on my best run with the stock short block I ramped up to 16.5* just north of 4k after launching around 13* or so. Through his peak TQ, roughly 5k RPM, he was at only 10-11PSI. If he weren't running strong times I feel like you'd be someone telling me it could take more than 17 to be optimal lol.

 

my steam vents are only in the front i never did the ones in the back which yea i know i should have my next build will have them for sure

like you said George the piston is broken pretty badly i must add its cracked at both ends of the wrist pin no clue how it didn't explode

I've looked at both head gaskets and can't see any signs of the heads pushing water but if theres something I'm missing enlighten me

 

Welcome to Boston

 

 

Milled 243s on a lq4 puts him higher close to 11.0

So 14-15psi and 17* is high with tight stock gaps

High compression needs to keep the timing down...its how i keep a ls3 alive with boost


You laugh it up but whos sitting on a situation and who isnt

Ive ran more boost and more timing on stock motors but less compression but motors also been prepped

You wont smell coolant if you lifted head

10.5 on street is probably from the bent rods not giving true reading of AFR as mentioned earlier

As for strong times, it doesnt matter to me one way or another as if you read every RGV person claims 9s on 12 psi from a 4.8

 

Well that could of got ya on rear cylinders but doesnt explain how steam cleaned pistons are

 

Looks like it lifted head and hydro locked it on the back one..