Cobalt blew up
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Cobalt blew up
I recently bought a 2006 cobalt ss Stage 3 supercharged. I bought it with a hole in one of the pistons. I replaced the piston and gaskets for about $300. The car was making about 20 lbs of boost. I put about a thousand miles on the car and then one day when I was pulling onto the highway I hit the gas and I heard metal spray from out the bottom of the car. I took the car home I sent the number 2 rod through the engine block. Prior to this happening I noticed that the engine had a lot of blow by. there was a puddle of oil in the intake and my dipstick kept blowing out of the tube. Why did it blow up?
#4
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Yes, extremely so.
It sounds like either the intercooler pump wasn't working or here was WAY too small of a pulley for the setup on there. Or both.
You never want to be on 20 pounds on the m62. Usually 12-17psi is where you always want to be.
It sounds like either the intercooler pump wasn't working or here was WAY too small of a pulley for the setup on there. Or both.
You never want to be on 20 pounds on the m62. Usually 12-17psi is where you always want to be.
#6
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You bought a used car with an engine that was already modded and beat on by the previous owner. There was a reason he sold it and sadly you found out the hard way what that reason was.
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#9
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well, if you really want some help with it you are going to need to post some more info on the engine setup so we can figure out whats going on. pics of the engine bay will help.
and $300 wasnt enough to properly fix a piston with a hole in it. im gonna guess you reused the head bolts (a big no-no) cause they are close to the total of what you spent.
and $300 wasnt enough to properly fix a piston with a hole in it. im gonna guess you reused the head bolts (a big no-no) cause they are close to the total of what you spent.
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well, if you really want some help with it you are going to need to post some more info on the engine setup so we can figure out whats going on. pics of the engine bay will help.
and $300 wasnt enough to properly fix a piston with a hole in it. im gonna guess you reused the head bolts (a big no-no) cause they are close to the total of what you spent.
and $300 wasnt enough to properly fix a piston with a hole in it. im gonna guess you reused the head bolts (a big no-no) cause they are close to the total of what you spent.
By the way the car was only $600 with 60 k miles
#11
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thats rediculously cheap price for what all is there. wow, so i stand corrected lol.
the blow by could possibly contributed to it. id bet the rings didnt seat and you were burning oil, and burning oil causes detonation. detonation hammers rod bearings, and that can result it throwing a rod out of it.
im more interested in the 20lbs boost. does the car still have a cat? aftermarket exhaust? what pulley is on it? any clue what injectors it has? id hate to see it all happen again with another engine.
the blow by could possibly contributed to it. id bet the rings didnt seat and you were burning oil, and burning oil causes detonation. detonation hammers rod bearings, and that can result it throwing a rod out of it.
im more interested in the 20lbs boost. does the car still have a cat? aftermarket exhaust? what pulley is on it? any clue what injectors it has? id hate to see it all happen again with another engine.
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thats rediculously cheap price for what all is there. wow, so i stand corrected lol.
the blow by could possibly contributed to it. id bet the rings didnt seat and you were burning oil, and burning oil causes detonation. detonation hammers rod bearings, and that can result it throwing a rod out of it.
im more interested in the 20lbs boost. does the car still have a cat? aftermarket exhaust? what pulley is on it? any clue what injectors it has? id hate to see it all happen again with another engine.
the blow by could possibly contributed to it. id bet the rings didnt seat and you were burning oil, and burning oil causes detonation. detonation hammers rod bearings, and that can result it throwing a rod out of it.
im more interested in the 20lbs boost. does the car still have a cat? aftermarket exhaust? what pulley is on it? any clue what injectors it has? id hate to see it all happen again with another engine.
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thats rediculously cheap price for what all is there. wow, so i stand corrected lol.
the blow by could possibly contributed to it. id bet the rings didnt seat and you were burning oil, and burning oil causes detonation. detonation hammers rod bearings, and that can result it throwing a rod out of it.
im more interested in the 20lbs boost. does the car still have a cat? aftermarket exhaust? what pulley is on it? any clue what injectors it has? id hate to see it all happen again with another engine.
the blow by could possibly contributed to it. id bet the rings didnt seat and you were burning oil, and burning oil causes detonation. detonation hammers rod bearings, and that can result it throwing a rod out of it.
im more interested in the 20lbs boost. does the car still have a cat? aftermarket exhaust? what pulley is on it? any clue what injectors it has? id hate to see it all happen again with another engine.
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Yes I'm planning on using a megasquirt ecu with a bigger turbo or taking it to zzp for a tune
#20
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no reason to use a megasquirt, in fact i can think of a lot of reasons not to. the factory ecu is leaps and bounds above a megasquirt as far as technology goes. the stock ecu will give far better cold start, driveability, fuel economy and diagnostics. its also fully tuneable with hp tuners. dont get me wrong, i like the megasquirt, ive done several cars with them in the past (have an ms2 sitting beside my desk), and in the right application they work great, however i see using one in a cobalt as a step in the wrong direction.
if your close enough to zzp where you can take the car to them to tune, do it.
if your close enough to zzp where you can take the car to them to tune, do it.
#21
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I recently bought a 2006 cobalt ss Stage 3 supercharged. I bought it with a hole in one of the pistons. I replaced the piston and gaskets for about $300. The car was making about 20 lbs of boost. I put about a thousand miles on the car and then one day when I was pulling onto the highway I hit the gas and I heard metal spray from out the bottom of the car. I took the car home I sent the number 2 rod through the engine block. Prior to this happening I noticed that the engine had a lot of blow by. there was a puddle of oil in the intake and my dipstick kept blowing out of the tube. Why did it blow up?
What piston had the hole in it? was it the same one that the rod let loos on?
If it had a hole it probably had some detonation going on and this wrecks havoc on rods/rod bearings anyways. Sounds like the damage was already done and you just put a bandaid on the first problem only to discover the second one.
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no reason to use a megasquirt, in fact i can think of a lot of reasons not to. the factory ecu is leaps and bounds above a megasquirt as far as technology goes. the stock ecu will give far better cold start, driveability, fuel economy and diagnostics. its also fully tuneable with hp tuners. dont get me wrong, i like the megasquirt, ive done several cars with them in the past (have an ms2 sitting beside my desk), and in the right application they work great, however i see using one in a cobalt as a step in the wrong direction.
if your close enough to zzp where you can take the car to them to tune, do it.
if your close enough to zzp where you can take the car to them to tune, do it.
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This is actually quite a problem with these cars, especially in the rust belt. My opinion would be to investigate the intercooler pump from a 2016 Polaris RZR Turbo. It is a brushless rig and way more reliable than the cobalt one. I am not 100% sure on wiring but, it will outperform the cobalt one in every aspect except weight.
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