Blown 4-banger

Most of the time not it doesn't. It sorta pushed the ring land out of the way, so it doesn't really explode or anything.

BlackSS/SC

Well once mine blows then it's time for pistons. Notice I said ONCE, cuz I know it will eventually.

Midnight

I wonder if there is a coolant bypass that we can create to move more coolant to the number 4 piston.

BlackSS/SC

I think it's more of a fuel shortage problem than a cooling issue.

HackAbuse

Fuel Shortage FTMFL!

Returnless Fuel System FTMFL!

People need to convert to a return system

BlackSS/SC

I can't wait till someone does it. I'll be converting. I gues then my 60lbers I just bought will be too big then though. lol

RollermanDan

https://www.cobaltss.net/forums/pictures-videos-64/nitrous-explosion-aftermath-pictures-56k-no-no-52806/ Some of you might already know about this one...

DWK5150

Convertig to a returnless isnt really all that hard.

BlackSS/SC

Well then do it!!! Just joking... How is the easy way to do it?

06blackg85ss

iTrader: (1)

once I get a few things out of the way that I'm working on... that is the next project to tackle shortly

RicerHater

do my eyes decieve me?! i cannot beleive it---this thread just makes me laugh...sorry ! inside joke

BlackSS/SC

Ok.........

Halfcent

Here's mine. Broke a valve spring.
https://www.cobaltss.net/forums/2-2l-l61-performance-tech-45/blown-engine-core-engine-pictures-11691/

CobaltPerformanceParts

Too many motors going poof!

sunfirejoe

iTrader: (1)

mine is gone, #4, i need a new sleeve as well which pushes me back even further

sunfirejoe

iTrader: (1)

yur exhaust starts to sound very very very hollow, and youll see blue smoke coming out of your exhaust, car was good down low horrible up top lol, belive it or not, but yah the car gets hot and exhaust is very hollow, i know mine was cuased by crappy tuning, but i think the fuel rail at the end near number 4 needs to be bored out, i believe GM cut to tight of a bend instead of having a nice even bend so i dont think #4 is getting enough fuel, someone should make a new fuel rail for us, i really think that would solve our problems

Blown 4-banger

Luckily mine is ok, because after I blew the ring land, I caught it and only drove it home before more damage could be done. The exhaust sounds really hollow, and just wierd, plus mine sounded like a WRX so that was a good indication that something was wrong

Also, before I do the twin screw I'm converting to a returnless fuel system, VERY easy to do with the stock fuel rail, considering it is a returnless fuel rail that it blocked off.

BlueSS-supercharged

^^^ can you explain more? so its possible to do a mod to the original to make a return?

BlackSS/SC

Ya someone really has to build new rail and/or return line system. I'd convert mine in a minute. I've got a hoist and all the tools but I don't want to mess with it without knowing what I need for the job.

So what would be involved in tuning after converting?

sunfirejoe

iTrader: (1)

tell me how and ill do it, yes i strongly believe, even when looking at the rail tonight, #4 just doesnt seem to have the bend, i tihnk a return line system would fix our woos as fuel would continue to pass by and drop in as i would normally in # 1, 2 and 3, so maybe just maybe while my rail is off, ill have my machinist look and see if he sees and imperfectiosna nd ill look into doing a return line, it shouldnt be overly hard

Yes at idle i burnt blue smoke, and WOT, the coolant temps were always on the rise, and i was running a cobra heat exchanger so people know, as well when the plug was removed it was full of oil

honestly my car ran maybe, just maybe 10 minutes after i noticed it was running weird, but i think i started burning oil the friday before, and didnt notice, as i was smelling burnt oil, but i thought it was drip off from my oil change, and yeah a WRX is the best way to describe the way the exhaust sounded, but its so weird cuz u couldnt even feel the ridge when i ran my finger nail across the wall, didnt even catch, but when honed and crossed hatced it was visible and beyond me wanting to use that sleeve

Asphalt Assault

changing the fuel rail, changing to a none return system? could it be that are flow by 2.6 or 2.6 plus blower porting pushes the fuel supply system beyond its abilities to supply?

some of you claim bad tune or could it be that it was time for the ringland to let go over time? these are cast pistons some are going to be good while others are poor.

there are lot of #4 pistons. should I survey all of you as to which piston let go in your car? I have not read back to see if it is truly everyone who blewup a 2.0l if it was #4.

EDIT: a thought. After rebuilding a motor and putting in forged pistons we will see how many #4 cylinders go. Costs money to do research?!

blown06

i will give an update on my car this weekend when we pull the pistons... btw my car had 9500mile when it went, 3-4k was on the 2.6, and 300 was on a ported blower 2.6.

Witt

Djt81185 and I are working a making a return style system. He picked up an extra rail and pump for us to modify. When we get it finished and working, I'll be sure to post about it.

With 20 lbs. of boost, that comes out to only 35psi effective rail pressure on our stock returnless systems, much less than I would like it to be. At idle, its near 75psi effective.

The thing bolted into the end of our rail is a pulsation dampener btw.

07cobaltowner

well if it's a blown COBALT thread than label it as such
quote"unofficial blown up engine thread"
where does it say cobalt. yeah its cobaltss.net but there is plenty of talk about other vehicles and other topics. if your going to flame me do it properly. fix the thread title

zomghax

The fact that this thread is in the 2.0L performance section leads me to believe that Ssnipes is primarily interested in the 2.0L LSJ Ecotec engine. But that's just me.