BMR Tech2

iTrader: (5)

It looks like we had an injector issue, or something to cause a lean condition on cylinder 4 and it got real ugly for our Magnuson supercharged/nitrous ls3 2010 SS shop car. We were trying for an 8.9x pass but instead it torched out the head gasket and partially into the head and block. Car still went 9.22 on this pass. This setup still did well for us for a few years, but looks like we found the limit of it. We are still hashing out what direction to go from here. Big cube n/a, turbo, or another roots style system. Either way, we will be back in action later this year with our multi-duty 5th gen!

Project GatTagO

iTrader: (7)

Wow...

Andrew

ZNix

iTrader: (1)

Big cube N/A is always fun!

cpolaris502

iTrader: (2)

It looks like a bullet shot through there. What went through there exactly? Was it just high heat and cylinder pressures that blew it out like that?

Mike@Diablosport

iTrader: (2)

Man, things got violent in there!

Ringland on the piston OK still??

01transampower

iTrader: (9)

That thing definitely got a little hot.....

Razor

Build thread for this car?

Roots/screw superchargers are the bastard child of forced induction, they don't make any power.

Remnant-of-VII

Riiiight...

I've seen some head gaskets blow out before, but I've never seen one that melted the head and the block that seriously before. Was that on a dry shot of nitrous?

stock48

iTrader: (17)

Looks like it might be able to be welded.

oscs

iTrader: (19)

That's what i was thinking.. looks like a wash out, throw a bead on it and machine the deck.

CameronVic

iTrader: (5)

I went 12.9 AF through the traps on my 9.96 pass (e85 gas scale). In my experience, lean has never hurt anything like this, too much timing lifts heads.

BMR Tech2

iTrader: (5)

We are suspecting some head lift due to aggressive timing. But it was isolated to this cylinder only. All others look fine. We kept it a little to the fat side to try to be safe. The piston and ring land appear to be intact so far, but we will tear down the bottom end to inspect it as well.

CameronVic

iTrader: (5)

Fat and too much timing would make it even more likely to turn that chamber into a plasma torch. Put in more fuel and then give it more time to burn. I know the reaction is to immediately blame an injector in this instance, but it could just be that this chamber was a little hotter than the other 7, and it's the one that let go first. Could you guys flow all the injectors just to try and rule that out? I'd love to see them flowed, and I'd shut my mouth if that one injector came back like 30% below the rest.

Ping King

iTrader: (20)

Weren't you also running meth on that as well? I remember seeing the car in person.

Any change you can weld up the block and resurface it?

BMR Sales2

iTrader: (40)

Yes, the car also had a meth kit on it too.

From everyone we have talked to it appears that fixing the head and block wouldn't be too big of a deal but we just have to figure out what we are going to do with the car. We have talked about toning the car down a bit and throwing the 6 speed manual transmission and concentrating on more handling oriented stuff. We have a LS3/TR6060 pullout that we picked up for our 68 Pontiac GTO project car that we have thought about throwing in there but who knows.

stevieturbo

I would always have said detonation caused it.

But given how common this sort of damage is and sometimes on well tuned motors, it does seem that when head gasket integrity is lost, this is just what happens sometimes due to combustion escaping.

Given there is a liner involved I dont see how that block can be easily repaired without also replacing the liner.

The head definitely can be repaired though. Mine was far worse than that and Trickflow repaired my head. Block was scrap though.

Either way anyway, the motor needs pulled and pistons/rings inspected

The Alchemist

iTrader: (19)

So where those stock head gaskets? I thought the MLS gaskets wouldn't compromise like that, but you learn something new everyday.

stevieturbo

If anything I think MLS gaskets are helping the damage when it happens.

With a thick composite gasket, the gasket usually burns away leaving the alloy barely damaged.

Because the MLS is more robust, the alloy almost goes first when gasket seal is lost, then combustion just blows it's way out like a plasma torch.

The Alchemist

iTrader: (19)

Very interesting. Good to know.

oscs

iTrader: (19)

That liner doesn't look damaged to me