LNf rods
05-15-2012 | 09:05 PM
#5
Senior Member
Joined: 03-05-11
Posts: 2,582
Likes: 1
From: Encino,Ca
I read somewhere that it comes with forged rods.. BTW it's not necessarily HP that kills rods, it's torque. About 500wtq or so would probably be the limit I would push as far as a stock engine.
LNF-A turbocharged direct injected (redubbed Spark Ignition Direct Injection) Ecotec was introduced in the 2007 Pontiac Solstice GXP and Saturn Sky Red Line. In these applications, the engine is mounted longitudinally. Displacement is 2.0 L1,998 cc (121.9 cu in)with a square 86 millimetres (3.4 in) bore and stroke. Compression is 9.2:1 and maximum boost is 1.4 bar (20.0 psi), delivering 260 hp (190 kW) at 5300 rpm and 260 lbˇft (350 Nˇm) of torque from 2500 to 5250 rpm. Engine redline is at 6300 rpm and premium fuel is recommended. The sodium filled exhaust valves were based on technology developed for the Corvette V8 powertrains. The sodium fuses and becomes a liquid at idle, which improves conductivity and draws heat away from the valve face and valve guide towards the stem to be cooled by the engine oil circulating in this area. The camshaft-driven direct injection systems pressurizes the fuel to 31 bar (450 psi) at idle, and up to 155 bar (2,250 psi) at wide-open throttle. The "Gen II" block is similar to the 2.4 L and also features VVT technology. The Gen II block was developed using data from racing programs and computer simulations. The bore walls and bulkheads were strengthened with a weight increase of 1 kg (2.5 pounds). The coolant jackets were expanded to improve heat rejection, resulting in a coolant capacity increase of 0.5 liters.
In December 2008, GM released a Turbo Upgrade Kit for the LNF engine which increases horsepower to 290 hp and torque to up to 340 lb.-ft, depending on the model. The kit retails for $650 and includes remapped engine calibration and upgraded MAP sensors. The kit is covered by the cars' existing GM warranties.[3]
Unique LNF features[4] include:
a twin-scroll turbocharger
cam-driven high-pressure gasoline direct injection fuel system
dual camshaft continuously variable valve timing
sodium-filled stainless steel Inconel exhaust valves
low-friction cast aluminum pistons with oil squirters
forged steel crankshaft
forged steel connecting rods
cast stainless steel exhaust manifold
In December 2008, GM released a Turbo Upgrade Kit for the LNF engine which increases horsepower to 290 hp and torque to up to 340 lb.-ft, depending on the model. The kit retails for $650 and includes remapped engine calibration and upgraded MAP sensors. The kit is covered by the cars' existing GM warranties.[3]
Unique LNF features[4] include:
a twin-scroll turbocharger
cam-driven high-pressure gasoline direct injection fuel system
dual camshaft continuously variable valve timing
sodium-filled stainless steel Inconel exhaust valves
low-friction cast aluminum pistons with oil squirters
forged steel crankshaft
forged steel connecting rods
cast stainless steel exhaust manifold
05-15-2012 | 10:44 PM
#7
I think ZZP took the stock motor to over 600 and the only reason it gave out was bc the boost controller malfunctioned and hit the motor with something like 53psi. I also remember reading somewhere that it was believed the stock bottom end was good to 700hp. I'm sure you couldn't drive for very long on anything that high but you get my point I'm sure.
05-15-2012 | 11:05 PM
#8
Former Vendor
Joined: 06-03-08
Posts: 4,169
Likes: 8
From: Grand Rapids, MI
We were throwing some theories around about the bent rods in the 530whp setup from a few years ago. One of the thigs that we needed to consider was that motor came out of a rollover car that could have filled the cylinders with oil causing the bent rods before I ever installed the motor. Wheteher that was the case or not, I did take the next motor past 600 as Frogs stated. I had one over-boost and then it let go on the next pull. I'm guessing it was at its limits anyway based on other high hp lnfs that have slight rod bend when disassembled.
I would say that they are good for 500whp with a good tune as long as detonation is kept out of the picture.
I would say that they are good for 500whp with a good tune as long as detonation is kept out of the picture.
05-16-2012 | 12:21 AM
#10
yeah that is plenty low 530whp on stock internals. To be honest nobody really needs to build these blocks unless you want rediculous power which is pointless unless its a DYNO QUEEN or a pure DRAG CAR. The LNF motors are very stout and that what german/ european engineering for you though
05-16-2012 | 04:35 AM
#11
We were throwing some theories around about the bent rods in the 530whp setup from a few years ago. One of the thigs that we needed to consider was that motor came out of a rollover car that could have filled the cylinders with oil causing the bent rods before I ever installed the motor. Wheteher that was the case or not, I did take the next motor past 600 as Frogs stated. I had one over-boost and then it let go on the next pull. I'm guessing it was at its limits anyway based on other high hp lnfs that have slight rod bend when disassembled.
I would say that they are good for 500whp with a good tune as long as detonation is kept out of the picture.
I would say that they are good for 500whp with a good tune as long as detonation is kept out of the picture.
05-16-2012 | 06:32 PM
#17
Former Vendor
Joined: 06-03-08
Posts: 4,169
Likes: 8
From: Grand Rapids, MI
05-16-2012 | 08:22 PM
#18
05-16-2012 | 09:20 PM
#21
Platinum Member
Platinum Member
Joined: 04-12-09
Posts: 4,910
Likes: 15
From: Connecticut
That definitely SUCKS though man! Having to drop the tranny again especially after you just replaced the clutch not that long ago. ****, after all this you're gonna be a pro at clutch jobs and tranny swaps on balts!
05-16-2012 | 09:23 PM
#22
That sorta makes a little more sense now as to how you were pushing 40lbs/min when you got tuned by James and you guys said you were on the stock turbo still..
That definitely SUCKS though man! Having to drop the tranny again especially after you just replaced the clutch not that long ago. ****, after all this you're gonna be a pro at clutch jobs and tranny swaps on balts!
That definitely SUCKS though man! Having to drop the tranny again especially after you just replaced the clutch not that long ago. ****, after all this you're gonna be a pro at clutch jobs and tranny swaps on balts!
..