GM’s New 6.2 Liter V8 L86 vs. 3.6 Liter Twin Turbo V6 LF3: By The Numbers
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GM’s New 6.2 Liter V8 L86 vs. 3.6 Liter Twin Turbo V6 LF3: By The Numbers In the red corner, weighing in at 6.2 liters of displacement, we have GM’s new 6.2 liter V8 (L86). The naturally-breathing engine makes 420 horsepower and 450 lb-ft of torque in the all-new 2014 Silverado and 2014 Sierra, using the trusted small-block push-rod setup, but with a few modern technologies, including Variable Valve Timing, Cylinder Deactivation (or Active Fuel Management/AFM), and Direct Injection. In the blue corner, weighing in at 3.6 liters of displacement, we have another new GM engine: a twin-turbocharged 3.6 liter V6 (LF3). The boosted six-banger also makes 420 horsepower, but 430 lb-ft of torque in the all-new 2014 Cadillac CTS. The engine is as power-dense as they get (116 horsepower per liter), representing the state-of-the art in powerplant engineering and design, through and through. As you may have expected, both engines take entirely different approaches to optimizing the modern internal combustion engine, but put out the same amount of power and sport similar torque figures. As it stands, The General can pick and choose the best engine for the appropriate application — using the big and burly V8 for trucks, and the smaller, boosted six-pot for sports cars. Feast your eyes on the similarities, and on the differences: (Chart on link) Read more: http://gmauthority.com/blog/2013/06/...#ixzz2XlAm0Pq7 Very interesting article! This may be what is to come if EPA standards continue to raise the bar every year. |
AFM is back, huh? Will GM ever learn its lesson?
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No weight mentioned?
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VR38DETT is way more power dense than LF3
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Cosworth's/Jaguar's CX-75 concept engine is a 1.6 and has 500+hp... so on that matter, it beats GM's and Nisssan's efforts :) |
GM isn't the only manufacturer with AFM. Fiat uses it on all their V8s if I'm not mistaken and even Honda uses it on their V6s.
The issue with AFM isn't cutting the cylinders off it's isolating the engine so you can't feel it. One of the biggest issues is the exhaust. As the engine shakes more in 4 cylinder mode, so does the exhaust and if it isn't isolated you can feel it. You can barely feel it in the FS Pickups and SUVs. But go look at the Camaro exhaust. I think in 2011 they added one more flex coupling for a total of 4 I believe to try and better isolate the exhaust. It's very tough to do when the exhaust is hanging off the body. The trucks have everything attached to the frame with one more level of isolation through the body mounts. |
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Another part of AFM that I think affects truck owners less than Camaro owners (and in particular, Camaro owners on this website) is aftermarket exhausts. I'm sure GM does what they can to eliminate the unpleasantness of the 3.1L V4 sound through careful exhaust tuning. But if you replace the muffler with one that isn't trying to minimize some of the bad frequencies (and instead might amplify a few of them), its not going to be a fun experience. |
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Guess no one is going to mention the RPO of the 6.2 which is L86. Wonder what's next in line as far as L87 and..........
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It was really close to being GM if the government had their way but that didn't happen so Fiat basically took the 2 billion they got from GM and got a controlling stake in Chrysler. So one could argue that Rick Wagner gave Fiat Chrysler. |
I'd be a lot more interested in seeing the physical dimensions and weight of both motors.
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