hey guys im new to the forum i just picked up a 05 cobalt ss for 3200 it has a lot of miles on it but it runs and drives fine still has the original clutch. this is my first cobalt and i wanna just some info about this engine since i cant really get straight answers from looking online

1 are the internals all forged or just some parts like the pistons and with and are they worth reusing

2. how much can this block be bored safely

3 how ahard is it to get like 300 ish out the engine

4 would zzp stage 2 cams a port and polish and valves and springs exhaust already have cai (ingen) and a stage two pully set be close to that

thanks appreciate the input

 

everything except the piston heads are forged. Stock components (when converted to turbocharger) are usually good to 450 hp. I wouldn't recommend boring as the sleeves are "paper thin" so to speak. Again, if you turbocharge the engine, 300 is actually a very decent baseline (depening on the size of the turbo).


In all honesty, if you're serious about rebuilding the engine, take a long look at the forced induction section of this forum, and that will answer your horsepower question. Find the thread about ZZ Performance testing the capabilities of their forged block (which is a VERY affordable option). They pretty much offer everything you want to do to this vehicle.

 

1 are the internals all forged or just some parts like the pistons and with and are they worth reusing
Just rods and the crank
As far as reusing.. just dpends what you're doing

2. how much can this block be bored safely
i do not know

3 how ahard is it to get like 300 ish out the engine
not too hard.. it's all easy if you got caaaaash

4 would zzp stage 2 cams a port and polish and valves and springs exhaust already have cai (ingen) and a stage two pully set be close to that
on stock blower, you'll need methanol or E85 and you'll easy break 300

 

Chevrolet Cobalt SS - Wikipedia, the free encyclopedia

GM Family II engine - Wikipedia, the free encyclopedia

here's a couple of references about the engine and the vehicle itself. Read these before you decide what kind of extensive modification you want to do.

 

do not bore these engine...ur better off running a stock size bore...
get a set of forged pistons.
arp head studs
and bearings and gasket..
the stock crank and rods on these engines r very strong for stock parts..
meth is a good idea
nos is probably better in my opinion cuz u dont always need it...

is this a DD car??

 

yeah, don't bore it, like tjolley says, do a stock bore forged piston, I happen to have a set I'm trying to get rid of too, doing a build for a friend who is deployed, and he has some aftermarket thicker sleeves in his block, and when it was at the machine shop they told me I needed to get bigger pistons, so I got him some .020 over pistons, and have his stock bore for sale, pm me if interested.

tjolley also has a good starter list started for you to reach your goals, a couple other things to get some more hp would be a smaller pulley, ported throttle body, and a good tune, and you will be well over 300hp, and very happy, if you take your time at getting your parts and watch the classifides, you can find some good deals on parts and you could possibably build to your goals for a few grand and have a pretty solid car, just need to reasearch based on what you want and stuff.

and welcome to the cumminity

 

also add a set of neutral balance shafts to the list...
there is a kit to delete them but i just recommend the NB kit from zzp...easy to install.

also start reading there is alot of good info on this site about these cars and engines..

also going turbo would probably be the easiest to get to 300whp. u will get more respect if u do it with a sc...anyone can slap a turbo on and make 300 easy hp..

 

yes this will be my dd and i would like to keep it supercharged and thanks for all the advice
so just the pistons are not forged correct and the miles on the car 150 k do you think that they will still be strong enough for 300 hp i forgot to put the miles srry.
also what about the super charger it self should i do new bearings and such
and 93 octane isn't sufficient for 300 hp

 

well, the miles really all depends on how its been treated for those miles, is it smoking out the exhaust and all that. what color is it smoking if it is, what kinda compression is on all the cylinders, and do they leak at all.

you can hit 300 on 93, you can honestly get pretty close to 300 by just dropping pulley size injectors, exhaust and intake and tuning, maybe a little meth, but honestly I think with a nice fresh engine and those mods, you'd be more than happy with it,

as far as the super charger, I'd throw some new bearings in her, but you can also find some low mile m62's from guys on here, or even get a ported one from some of the vendors for a pretty cheep price,

 

theres no smoking no knocks or ticks and it still has the original clutch and it doesn't slip so i don't think it was abused and it was the original owner i got it off

 

the bad thing with the stock pistons at that hp is of u get a lil detonation for some reason...pop goes the engine...u will crack the pistons..
so just do ur engine and u a favor and drop some good 9.5 to 1 pistons in it...

 

im a bit confused by your comment about the compression by good pistons do you mean forged 9-5 -1 or lower compression forged pistons i will be getting forged either way

 

get ur self some diamond pistons from ottp...they r the best bang for ur buck...if this is gona be a dd i recommend the piston side coating...9.5 to 1 compression ratio..

 

9.5:1 is the compression ratio from factory on the lsj engine. No need to raise or lower it.

actually, Aaron @ Turbo Tech Racing offers much better deals. PM him and you'll see.