Engine Clanking -WTF!!!

[Kracka]

What are you guys speculating (Shane, Mo, Swanny) about? Pre ignition causing the valve to snap and dominate the shit out of everything it can? Seems relatively obvious to me that is was a random valve failure. Even more so after what he just posted.

I'm with this theory.

[jhaan_dude]

wow alex just had the same shit happen to his 1g last week, he was driving and BANG!!!

thats the last time it has run...kinda funny how it was the same thing...

[turbotalon1g]

^you sure?

[Halon]

I wouldn't think at 1/4 throttle, 3-4k RPM's, rush hour on Central kind of driving conditions, that my motor would detonate enough to cause something like this.

[niterydr]

What are you guys speculating (Shane, Mo, Swanny) about? Pre ignition causing the valve to snap and dominate the shit out of everything it can? Seems relatively obvious to me that this was a random valve failure. Even more so after what he just posted.

It was a theory, but thats why I ask which valves and springs first...

I've seen the stockers randomly fail, but aftermarket if it isn't caused by a foreign object, it usually is a tuning issue. To heavy of a spring on a stock valve can cause added stress at the base of the valve as well.

But Brandon answered my question before I had to ask the 2nd one. Tough break Brandon.

[FattyBoomBatty]

Tough break Brandon.

What you did there. I see it.

[Shane@DBPerformance]

It's hard to tell from the pictures. I can't tell, if all that damage is from a shit load off beating from the valve or if that's melted alum from pre-ignition. Maybe it's obvious in person. I have only seen stock valves fail when a piston hit them from a broken timing belt or whatever and there usually isn't that wide spread of damage even with a broken valve in there, but usually when a timing belt breaks, the motor stops running pretty quick versus Halon's that might have kept running longer with the other 3 cylinders still fine.

My reasons for thinking pre-ignition was the hole in the center of the piston, which is a sign of it. What looks like melted alum all over the piston, head and spark plug, which can be pre-ign, but maybe it's just beat up metal and not melted. A melted valve that fell off, which can be from pre-ign. And I was thinking that maybe the pre-ign started and first thing to start melting was the spark plug, which caused the tach to start going wierd once the electrode melted to the ground strap, then things keep heating up and the valve and/or the piston failed soon after.

Regardless, I would get the fuel injectors tested before putting them in a new motor.

[Shane@DBPerformance]

Pre-ignition and detonation are two different things. Often them come hand in hand though with bad detonation causing pre-ignition to occur. But you can have a pre-ignition failure caused by something else.

I wouldn't think at 1/4 throttle, 3-4k RPM's, rush hour on Central kind of driving conditions, that my motor would detonate enough to cause something like this.

[Halon]

I will definately get the injectors looked at. I'm even thinking about switching injectors. FIC has a new style 1600cc injector that's supposed to be coming out that are ball & seat design, and should help improve idle a bit as well.

Thanks for everyones help and ideas!

[Goat Blower]

Just get them tested and balanced by that local guy. I can look up his number if you need it.