Hi everyone. I am new to the group. Hopefully i put this in the righ place. I am in need of some SERIOUS HELP on my 2005 ls2 gto. Here is the build and specs on my engine
-Stock engine block alluminum ls2 6.0
boost distric lsa ls2 spercharger kit
2.45 SC upper pulley
fuel clinic 1000cc injectors
1:1 fpr
dual 450 fuel pumps
btr stage 3 torque cam
btr 660 dual sping valve springs
comp lifters
7.4 harden pushrods
ls7 head gaskets
shorty headers
slp loudmouth exhaust
rtx mcleod twin disc clutch
1 peice alluminum driveshaft
dyno 550whp was told by previous owner car was built 9k mile ago with a rebuilt shorblock

Ok so here is a short stoy. I bought the gto about 2 weeks ago. after buying it i noticed a abnormal sort of tap sound that got pretty loud after warmup (kinda a similar sound that my old semi built procharged c6 made but louder). It Didn't soud like a rod bearing to me but more of a tappy loud lifter like i've heard in the past. I dove the car about 40 miles registered it and etc. then all of a sudden it stopped and locked up at 10mph oil and and coolant everywhere. I never even took the car past 1/3 throttle as i was gonna investigate the sound 1st. I am very mechanically inclined so i started to investigate what blew up this morning and found a wrist pin had put a hole into the side of my passenger side oil pan!! then i started to teardown heads to further investigate. I took the supercharger hat off and BAM I see large chunk of cast alluminum under the hat dime size pebble diameter chunks!!! proceeded to start taking heads off and found a bent valve on cyclinder 8 and a etched piston.. I am so confused from this situation. How did huge chunks of cast get into my supercharger then proceed down into my heads bend the valve and kill the rotating assembly!! I havnt found out where the broken cast came from yet But i am assuming the supercharger destructed!?!?!? supercharger still spins and i feel no bearing damage. I have a few pics to show there is alot more details i can explain. But i am generally confused and cannot find any answers online with a scenario like this

chunks in supercharge coolant oil debri etc

bent valve and no signs of bad head gasket

piston contact

oil pan hole


b4 it blew

 

The first thing I'd be looking up here is the statue of limitations for lemon law stuff if you bought it 2 weeks ago. Previous owner obviously built something incorrectly or knew it was about to go and wanted this to be someone elses (unfortunately your) disaster...

 

What a coinkidink. I blew up an LS1 LSA combination last year because I didn't do the things I should have and didn't catch on to some key warning signs.

Long story short, generally the only way you can rip a wrist pin out of the bottom of a piston is to butt the rings. I'm assuming that wrist pin in your pictures still has a piece of rod attached to it.

The reason that debris goes through the blower is because when the driver lifts off the gas the bypass valves open creating a massive vacuum cleaner.

When mine let go it destroyed the following.

The blower (rotor pack was garbage),
The block,
The crank,
Rods and Pistons,
The Cam,
The oil pump,
The oil pan,
The intercooler brick,



All told it cost me about 9k my labor to replace it all the way I wanted it. No further complications with the new properly setup engine.


I'm not going to offer any advice as far as the previous owner. Generally when you buy a modified used vehicle it's buyer beware.

 

One more thing to be noted when i was investigating. everything under the valve cover b4 head removal ( rocker arms, push rods, valve springs etc) were clean and undamaged with no debri, cast chunks etc.. even still remnance of clean oil. 1bent valve upon head removal. So is it possible for all those big chunks of cast to suck up into the supercharger in a split second without damaging more valves? I could litterally fill up a double shot glass with all the pebble sized chunks i found in the supercharger. I'm baffled. but I will tear the block down and rip the supercharger apart in the a.m.🤷‍♂️

 

Yes in a split second. That's all it takes.

 

Man, I'm really sorry for your situation!! It sucks...

 

It's all squared away now grinder. Been back up and running since late August of last year. Running better than ever!

I knew the LS1 would blow up some day but I had no idea the collateral damage would be as bad as it was. I had the worse failure possible and with a PD blower it makes it even worse.

This is just my personal Opinion to the OP or anyone else. If running a SBE and running more than 5 or 6 psi of boost GAP THOSE RINGS. I know it's a **** ton of work for no performance gain but it could save your engine.

 

Good info for all is if something blows, you need to check every last thing before you salvage what is left, especially on the intake side. I know a guy who dropped a valve in an inline four M/C engine. Got it all back together, fresh everything, and started it. The engine instantly went to a 3,000 rpm idle. He quickly shut it down. When he pulled the carbs, one slide had a piece of broken piston holding it open at about 1/4 throttle!! Lucky he didn't have to rebuild it a second time!!!

 

...."running better than ever"......Thats because you installed my dipstick assy!!!! Teasing, of course

 

This is a mantra of any and every person who knows anything about any pressurized engine.
Just good common sense for those under pressure....
Thank you Mr. Black...