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Old 06-30-2013, 10:17 PM   #1
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Arrow GMs New 6.2 Liter V8 L86 vs. 3.6 Liter Twin Turbo V6 LF3: By The Numbers



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.
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Old 06-30-2013, 10:32 PM   #2
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AFM is back, huh? Will GM ever learn its lesson?
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Old 06-30-2013, 11:06 PM   #3
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No weight mentioned?
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Old 07-01-2013, 06:22 AM   #4
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AFM is back, huh? Will GM ever learn its lesson?
As long as there is CAFE there will be afm.
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Old 07-01-2013, 07:34 AM   #5
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AFM is back, huh? Will GM ever learn its lesson?
AFM never went away. And for the vast majority of people out there it's a non-issue.
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Old 07-01-2013, 07:54 AM   #6
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VR38DETT is way more power dense than LF3
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Old 07-01-2013, 08:04 AM   #7
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VR38DETT is way more power dense than LF3
All down to boost levels...

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
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Old 07-01-2013, 08:10 AM   #8
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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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Old 07-01-2013, 09:18 AM   #9
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Quote:
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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.
I don't believe the 6.4 in the SRT8s has cylinder de-activation.

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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Old 07-01-2013, 09:37 AM   #10
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Quote:
Originally Posted by Number 3 View Post
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.
Actually CHRSLER'S V8s do. 1 Chrysler is not 100% owned by Fiat, 2 the engines and a lot of the tech is different enough throguh Fiats different companies (Maserati, Ferarri, Fiat, lancia, Alfa Romeo) differes enoguh that even if they did it is important to mention which umbrella the engine you are speaking of falls under.

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I don't believe the 6.4 in the SRT8s has cylinder de-activation.

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.
The 6.4 on automatic SRTs do, on manuals they do not. Same with the 5.7.
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Old 07-01-2013, 10:17 AM   #11
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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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Old 07-03-2013, 09:09 PM   #12
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Actually CHRSLER'S V8s do. 1 Chrysler is not 100% owned by Fiat, 2 the engines and a lot of the tech is different enough throguh Fiats different companies (Maserati, Ferarri, Fiat, lancia, Alfa Romeo) differes enoguh that even if they did it is important to mention which umbrella the engine you are speaking of falls under.



The 6.4 on automatic SRTs do, on manuals they do not. Same with the 5.7.
Sorry majority owned makes them Fiat. JMO. Will you guys buy it in 6 months when they own 100%? They are controlled by Fiat plane and simple.

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.
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Old 07-04-2013, 12:14 AM   #13
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I'd be a lot more interested in seeing the physical dimensions and weight of both motors.
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Old 07-04-2013, 12:18 AM   #14
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Quote:
Originally Posted by Number 3 View Post
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.
Audi uses it on their V8 as well (at least on the S6 I've been looking at)...
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Old 07-04-2013, 12:27 AM   #15
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I'd be a lot more interested in seeing the physical dimensions and weight of both motors.
I read in Popular Mechanics that the new twin turbo V6 weighs 37 lbs less than the BMW 4.4L twin turbo V8. Unfortunately, that isn't terribly useful if we don't know how much the BMW engine weighs.

No word on the next gen small blocks, though I have heard that the LT1 will be a little heavier than the LS3
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Old 07-04-2013, 12:33 AM   #16
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I'd be a lot more interested in seeing the physical dimensions and weight of both motors.
This.

Size and weight seem more important than power density.
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Old 07-04-2013, 08:19 PM   #17
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I seemed to miss the question about size yesterday.

I'd say that overall height wise the two will be fairly similar, the V6 might even be a tad taller. The V8 will obviously be longer (1 more cylinder per bank with bigger bore spacing) and probably a touch wider (the heads on an OHV don't stick out as far as OHC heads do, but the V8 would also have a taller deck sticking out at 45 degrees from vertical rather than just 30 off.
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