LNF, LDK, or LAF - Cobalt SS Network



2.0L LNF Performance Tech 260hp and 260 lb-ft of torque Turbocharged tuner version.
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Old 03-16-2013, 02:20 AM   #1
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LNF, LDK, or LAF

Thinking about doing a build since I've decided to keep the car. I have a 2009 cobalt SS/TC with metal in the oil, so it'll be going in for warranty work, which will probably include a new engine and Turbo, since metal in the oil will ruin both. I've read that all new replacement LNF's are actually LDK's which have a much better cast block and are the euro spec LNF. The other option is to get the engine and sell it to help cover the cost of a LAF swap which is the 2.4 "LNF" out of the equinox. This whole idea is banking on finding a fuel solution so it doesn't die out at 400 or whatever they've made it to now.

Also, what is everyone doing with their transmissions to hold power? Just swapping a zzp rebuild? Cryo? I haven't been paying much attention in the past few months and we all know the search on the forum blows
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Old 03-16-2013, 03:25 AM   #2
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Subd. This should be interesting. I'll be building my motor next year.
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Old 03-17-2013, 07:04 PM   #3
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I've been thinking about it, and I'll probably just run the LDK.

Anyone know anything about the fueling issue?
Will a second set of injectors (in the intake) help?
Is it just a tuning issue, a DI pump issue, etc...
I'd really like to know where the problem lies...!

Still looking for input on the transmission/drivetrain side of it too.
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Old 03-17-2013, 07:12 PM   #4
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the injectors max out, but 5th injector and upgraded fuel lobe help to a point. and i doubt that they will put in a different engine other than a factory replacement. i dont see why they would put in a different block.
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Old 03-17-2013, 07:33 PM   #5
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my buddy just ran his without oil, metal shavings and oil cap just smoking, they just replaced pistons and rings only, dont be suprised
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Old 03-17-2013, 07:41 PM   #6
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I don't think they would put in a different block. Probably the most you could hope for is a reman LNF. When it comes to warranty work, GM goes the cheapest route factoring in man hours and parts over a swap.
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Old 03-17-2013, 07:43 PM   #7
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Id be really surprised if they did an engine swap. They practically would try to get you into a cruze before that lol.
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Old 03-17-2013, 07:51 PM   #8
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Did you mean 400hp lnf ldk or were you talking about the laf? I didn't find anything on a turbo'd laf.
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Old 03-17-2013, 10:44 PM   #9
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It depends on how bad it is and what all is falling apart. And they don't use remanufactured engines for warranty work. The LDK is the lnf replacement because it cost too much to have a assembly line tooled just for LNFs. And I haven't seen any turbo LAFs but from what I understand is a LNF with more displacement.
When it comes down to it, it's the technicians choice as to what to do. And trust me, rebuilding one costs way more than them swapping in a replacement.

As for the fueling if its just the injectors there's a pretty popular place near me in Tampa that rebuilds and can upsize injectors on most applications if I can't find any to fit. I was also thinking of having a custom intake welded up to fit 4 extra injectors to kill 2 birds with one stone (coking intake valves issue).
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Old 03-23-2013, 02:36 AM   #10
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Just waiting for my engine to pop to see if you guys are right. I hope they do give me the LDK though.

After that, I'll be going with beefed up internals, lots of head work, probably a gt30 series turbo, upsized (or just rebuilt) di injectors, a set of extra injectors in the manifold, etc. Its all pending whenever I sell my ls1 and 240sx shell.
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Old 03-23-2013, 04:33 PM   #11
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good luck and your right about a reman or rebuild being more expensive lol course ive went all out though, btw I went with zzp's stage 2 trans they said it will safely hold 500whp
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Old 03-23-2013, 08:20 PM   #12
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LDK....damn, read on it just now. Definitely looks like it has potential.
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Old 03-24-2013, 02:08 AM   #13
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Originally Posted by etnies View Post
good luck and your right about a reman or rebuild being more expensive lol course ive went all out though, btw I went with zzp's stage 2 trans they said it will safely hold 500whp
I can't even find a listing for transmissions in zzp's website anymore.

Btw, what rotating assembly are you using? pistons, rods, crank, bearings etc....
I just need to start planning everything out so I can go from there.
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Old 03-24-2013, 08:39 AM   #14
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I can't even find a listing for transmissions in zzp's website anymore.

Btw, what rotating assembly are you using? pistons, rods, crank, bearings etc....
I just need to start planning everything out so I can go from there.
thats because their doing the 6 speed now
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Old 03-24-2013, 10:19 AM   #15
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just a note, I threw a rod in my 08 cobalt ss a few months ago, they put a remanufactured engine in, not new. They said they only replace with new engines if the car is essentially new anyways. That once its got some miles on it they will only do remanufactured.
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Old 03-24-2013, 06:44 PM   #16
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thats because their doing the 6 speed now
Have they got the 6 speed to hold any power? What's going to be the price difference?
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Old 03-24-2013, 06:45 PM   #17
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just a note, I threw a rod in my 08 cobalt ss a few months ago, they put a remanufactured engine in, not new. They said they only replace with new engines if the car is essentially new anyways. That once its got some miles on it they will only do remanufactured.
Wow. Things must be a little different in your neck of the woods or I've been out of the dealership longer than I remember.
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Old 03-25-2013, 05:03 PM   #18
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Have they got the 6 speed to hold any power? What's going to be the price difference?
The 6 speed is designed to hold additional power and has been rated higher by GM from the factory than the F35 as well.

The current price was projected to be $3,500. It includes a lot of parts: F40 transmission itself, Fidanza flywheel, 6 puck clutch disc, billet trans mounts, steel shift cables, 4340 chromoly axle, intermediate shaft, and a new shifter assembly.

Edit: Forgot to add that you can source your own F40 tranny and just buy the conversion kit for the rest of the other parts if you want.

Last edited by Stamina; 03-25-2013 at 06:01 PM.
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Old 03-25-2013, 05:21 PM   #19
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Originally Posted by oopsitouchedmyself View Post
just a note, I threw a rod in my 08 cobalt ss a few months ago, they put a remanufactured engine in, not new. They said they only replace with new engines if the car is essentially new anyways. That once its got some miles on it they will only do remanufactured.
jesus what did you do to throw a rod? lol
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Old 05-02-2013, 09:11 AM   #20
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im looking into ordering the LDK from zzp to swap into my car. unfortunately i blew my engine and i priced out the fully forged gen 3 short block + head and cams and it was WAY to much so i ordered the head and cams, pistons and k1 rods but now im running into the issue of i need to machine my block but i really dont have time to do all that nor the place. i found the LDK and now im looking at that and paying a shop to do the swap, im just sick of seeing my car sit in my driveway and driving my turn of a civic.
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Old 05-02-2013, 09:25 AM   #21
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Local here blew a lnf motor and the dealer put in a remanufactured engine under warranty . Pinching pennies I guess
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Old 05-02-2013, 12:56 PM   #22
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im looking into ordering the LDK from zzp to swap into my car. unfortunately i blew my engine and i priced out the fully forged gen 3 short block + head and cams and it was WAY to much so i ordered the head and cams, pistons and k1 rods but now im running into the issue of i need to machine my block but i really dont have time to do all that nor the place. i found the LDK and now im looking at that and paying a shop to do the swap, im just sick of seeing my car sit in my driveway and driving my turn of a civic.
#slammedlifeeeeee hahaha phones totalled man
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