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  #1  
Old 13th June 2010
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Question Saab Piston VS Cobalt Piston.. is it the same?

Well... need to know if its true that Cobalt ss sc Piston are the same as the saab 9-3?

I need to change them and someone tell me its the same thing... but cost the half of the saab one..

Anyone have info about it??

Thx
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  #2  
Old 13th June 2010
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Good way to find out...
Buy both of them! If they have a full return policy, that is.
Otherwise, my educated intuition would wager that they are, or atleast the cobalt's has better rings..
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  #3  
Old 13th June 2010
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After some digging they should work as long as the valve clearance will be identical.

The 9-3 2.0T uses GM's LK9 Engine. 86MM bore 9.5:1 compression ratio and all cast aluminum construction.

The 2008-2010 Cobalt SS uses the LNF platform from GM. Same bore as the Saab 2.0T engine however the compression ratio is 9.2:1 which is better if you want to add more boost pressure to your 9-3.

http://en.wikipedia.org/wiki/GM_Family_II_engine#LNF


Hope this sheds a little bit of light on your question.
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  #4  
Old 13th June 2010
Tedjs Tedjs is offline
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Pistons in the LNF engine have are specifically designed for the direct injected engine to spread the fuel around the combustion chamber during the injection event.

Installing them in a non direct injected engine would most likely result in poor idle quality at the very least since the fuel and air would not be mixed properly in the chamber during the compression stroke.

Best look into an aftermarket source if you are going to invest in your engine.
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  #5  
Old 13th June 2010
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Why couldn't you use pistons from an earlier non DI Cobalt engine?
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  #6  
Old 13th June 2010
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hes talking about the supercharged version, not turbo. the sc did not have di.
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  #7  
Old 13th June 2010
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Quote:
Originally Posted by mikesul View Post
Why couldn't you use pistons from an earlier non DI Cobalt engine?
How do we know if those are better then the pistons on the Saab application?
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  #8  
Old 13th June 2010
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"The LSJ is a supercharged version of the LK9 Ecotec with an Eaton M62 Roots-type supercharger and air-to-liquid intercooler. It is rated at 205 hp (153 kW) at 5600 rpm and 200 lbft (271 Nm) at 4400 rpm with a compression ratio of 9.5:1 and a 6500 rpm redline. With the end of the Chevy Cobalt S/C SS and Saturn Ion Red Line, the LSJ was discontinued after 2007." - http://en.wikipedia.org/wiki/GM_Family_II_engine

I would say yes they will fit lol but I am not a mechanic.
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Old 13th June 2010
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ok thx for all the info... its my friend who work with a dude who work like 17 for saab and he told him... Tell your friend that he could use cobalt piston and it will be way cheaper $$$

Just want to be sure...

thx again
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Old 15th June 2010
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Pistons should work no problem.

http://intense-racing.com/Merchant2/...e=LSJ_Hardcore
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Old 15th June 2010
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Or you could just buy the ones from GS made for our cars. They have the JE Forged kit for $534.00, but they are only designed for standard bore. Depending on how much wear your engine has your builder would probably recommend at least a .10 overbore.

http://www.genuinesaab.com/catalog/p...9756fff63e6381
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  #12  
Old 15th June 2010
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yeah I know about the JE from GS.. but the car is being repair at the stealership... so i dont think they will accep to put those one... and its say that it could take about a month to have them from GS...
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  #13  
Old 15th June 2010
MrStaticX MrStaticX is offline
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http://www.turbotechracing.com/produ...dcategory=5616

I would check out CobaltSS.net there are A LOT of knowledgeable people there who will be very happy to help in any way!
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Old 15th June 2010
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Quote:
Originally Posted by glowing626 View Post
yeah I know about the JE from GS.. but the car is being repair at the stealership... so i dont think they will accep to put those one... and its say that it could take about a month to have them from GS...
If that's the case it doesn't matter if the Cobalt pistons are the same since more than likely they will order from the Saab catalog.
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  #15  
Old 15th June 2010
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Quote:
Originally Posted by cjhutch View Post
If that's the case it doesn't matter if the Cobalt pistons are the same since more than likely they will order from the Saab catalog.

Well its me who have to pay.. not garanty anymore....

So if the cobalt piston fit... I want them to put them instead paying the double $ for the same piston...
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  #16  
Old 15th June 2010
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Quote:
Originally Posted by glowing626 View Post
Well its me who have to pay.. not garanty anymore....

So if the cobalt piston fit... I want them to put them instead paying the double $ for the same piston...
That's my point, why would they not accept JE pistons or pistons from any company if you are just paying them for labor. With that being said, there has to be a shop somewhere that will perform the work for less.
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  #17  
Old 18th June 2010
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Default Pistons

You could go to an aftermarket parts vendor who has listings for internal engine parts. or call a local engine rebuilder. Ask them to look up the aftermarket piston for your car and then one for the Cobalt and see if the application is the same. If it is, then you know the factory installed pistons in both cars are most likely the same.
It's called "cross-referrencing". You can try this yourself using oil filters as an example say in walmart. When I had my 89 900 turbo, I found out the oil filter for that car also worked on my daughters dodge neon.
I realize oil filters are not the same as pistons, but you get the idea!
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