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Infiniti will turn to turbocharged 4- and 6-cylinder engines, hybrids, full electrics

"And another one gone, and another one gone / Another one bites the dust"
 
Well, it looks as though the recently approved CAFE standards that aim to increase automobile fuel economy to 54.5mpg by 2025 have claimed another victim. Infiniti currently has V8 engine options available in its M luxury sedan, FX crossover, and QX sport utility vehicles, but that likely won't be the case in future iterations of those vehicles.
 
According to a report by AutoGuide, increasingly stringent fuel economy and emissions regulations mean that V8 engines are no longer on the table for Infiniti vehicles. V8 engines have traditionally been available in luxury vehicles as a symbol of prestige and power, but Infiniti will look to new ways to bring powerful engines to its lineup while still keeping fuel economy in check.
 
“I don’t think any car that is on Infiniti drawing boards from here onwards we should expect a V8 to be included in that plan,” Johan de Nysschen, Infiniti's global president.
 
Infiniti's 5.0-liter V8 produces 385hp, its 5.5-liter V8 produces 420hp, and its 5.6-liter V8 (truck-based) produces 400hp.


Infiniti to say good-bye to V8 engines
 
There are numerous directions that Infiniti can take with the absence of a V8 engine. Automakers like Ford already have twin-turbocharged V6 engines that develop 365hp while still delivering respectable fuel economy. Even Hyundai is rumored to be getting in on the action with a twin-turbocharged 3.3-liter V6 which generates 395hp.
 
For entry-level and mid-range models will also see a shift in available engines as well. Infiniti's current workhorse engine is the 3.7-liter “VQ” V6, but Nissan is also working on a turbocharged four-cylinder engine to deliver comparable power and vastly improved fuel economy.
 
Other options for Infiniti include fully electric vehicles (like the LE Concept) and additional hybrid models (we’re hoping that Infiniti delivers a production version of the Emerg-E).
 
Infiniti isn't the only luxury maker to drop a V8 engine from its lineup. When Lexus redesigned its mid-range GS sedan, it dropped the 4.6-liter V8 engine option and instead launched the vehicle with a 3.5-liter V6 and a 3.5-liter V6/performance hybrid model for those that want the power of a V8.

Source: AutoGuide



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By sprockkets on 9/4/2012 2:44:34 AM , Rating: 3
quote:
In my opinion, I think a 1.5-2.0L turbocharged inline 6 engine would be sweetness as it would provide the smoothness and balance of a V8 with the fuel economy of a 4 cylinder engine.


Perhaps you know this, but no V8 is naturally balanced. Either you have to balance it with heavy counterweights which make for a "laggy" engine (typical V8) or you have a high reving engine but is unbalanced.

Looking at the big picture here, we have 3.5l V6s that put out the same or even more than their old larger V8s did. Who needs a V8? Too many morons on the road have more than 300HP available to them, with some around the 550-650 mark in high end SUVs.


By Pneumothorax on 9/4/2012 10:37:40 AM , Rating: 2
Yes, a v8 is less balanced than a straight 6 or a v12, but it's still much better than a V6.


By Manch on 9/4/2012 12:06:24 PM , Rating: 2
I've never seen an unbalanced high revving engine. Mainly because they explode when you attempt to take them that high.

What do you mean by laggy? Trying to understand your point here.

Yeah, you do have V6's capable of putting out the same or more power as the larger V8's but you also have larger v8's that put out more power than those v6's so your point on that is? Doesn't matter how you try and get around it, a v8 has more potential for power than a v6, period.


By sorry dog on 9/4/2012 9:14:35 PM , Rating: 2
Weight balance is not the same as harmonic balance. Ferrari V8's use a flat plane crankshaft, which is less balanced but is lighter and makes a better exhaust note. Most other V8's use a crossplane crank cast with counterweights that result in much smoother operation, but with associated response penalty from increased rotating inertia.

...and by laggy he meant the throttle response...or quick revving and return to idle.

Also, to say a V8 has more potential power is not quite right. Many industrial diesel engines have six holes and put out thousands of pounds of torque.

As for cars...the availability of knowledge and parts for high performance gas V8's is much greater than other V6's, but that shouldn't be confused with the number of holes it has...displacement X volumetric efficiency will tell you much more about an engine's potential output. One ride in a Buick GNX will make you think twice before saying that.


By Manch on 9/5/2012 3:05:59 AM , Rating: 2
So how does Ferrari compensate? YOu say less balanced, the op said unbalanced which is why I questioned it. I don't just see a v6 being THAT much better in the throttle response if at all. Then as many posters have pointed out v6's have there own problems vs v4/v8's.There are many factors that can affect throttle response. Just being a v8 doesn't mean it will be "laggy"

We're not talking industrial diesel engines here, we're talking car engines so that has no bearing.

If I have to choose between a v6 and a v8 with equal displacement, Ill go with the V8. Buick GNX's are awesome cars, but that's a turbo 6 so again you're veering off point.


By 91TTZ on 9/4/2012 1:11:02 PM , Rating: 3
quote:
Looking at the big picture here, we have 3.5l V6s that put out the same or even more than their old larger V8s did. Who needs a V8?


The thing is that V8s aren't really any less fuel efficient than a 3.5L V6 that can produce the same power.

For example:
My 1991 300ZX TT with 3.0L TT V6, 300 HP stock gets 17/19/22 mpg:
http://www.fueleconomy.gov/feg/noframes/7570.shtml

2005 350Z with 3.5L NA V6, 300 HP stock gets 17/20/23 mpg:
http://www.fueleconomy.gov/feg/noframes/20501.shtm...

2001 Corvette with 5.7L NA V8, 350 HP stock gets 17/20/26 mpg:
http://www.fueleconomy.gov/feg/noframes/16439.shtm...

And just for kicks:
2006 Corvette Z06 with 7.0L NA V8, 505 HP gets 15/18/24 mpg:
http://www.fueleconomy.gov/feg/noframes/21621.shtm...

Skyline GTR, 3.8L TT, 485 HP gets 16/18/21 mpg:
http://www.fueleconomy.gov/feg/bymodel/2009_Nissan...
(I know that's AWD so it's at a disadvantage)

It doesn't look like the V8s do poorly in the fuel economy department for the power that they make. When you attempt to make that kind of power with smaller engines the fuel economy drops on them as well.


By theapparition on 9/4/2012 2:12:56 PM , Rating: 2
Excellent point.

I've yet to find a performance V6 that will provide better fuel economy than a V8 at similar power levels.

And when you get down to it, an engine is really an air pump. To get a specific amount of power, you need to pump a specific amount of air. Couple that with a stochiometric air:fuel ratio*, and it doesn't matter in the end whether it's a V6, V8 or V12. It all has to pump the same amount of air.

The differences now become the other tricks that can be done, such as lowering Cd and rolling resistance, optimizing the transmission gears and rear end for performance/efficiency, and other tricks like limiting pumping work and friction (where V8s are at a disadvantage).

The magic of forced induction (turbos/supercharging) is that it allows you to run a slightly more efficient engine during city/highway driving, then boosting the pressure only when going full throttle. There is certainly some advantages, but it also comes at a higher price, hotter and more structurally sound engine required, and higher complexity. But fuel economy doesn't change that significantly because turbos require a richer mixture.

*Typical 14.1:1 AFR for normal driving, but when going into PE mode (full throttle), the AFR needs to drop to protect the engine. Typically run much richer ~12.5:1. While turbo or supercharged cars must run even richer, dipping down close to 10:1.


By Manch on 9/4/2012 2:27:40 PM , Rating: 2
I run my car 11.8:1 I think that is more specific to what engine you're running. I have a 2.3 whipple running 16psi. Cant take it any higher without a race belt system. One thing I like about it over turbos is instant torque, no lag, make power at partial throttle. It's great for a street/strip car.

If I was doing a dedicated car for the strip, I'd probably run turbos. I dont do that 40 roll bullsh!t. Want to race, race from a dig.


By theapparition on 9/4/2012 2:01:11 PM , Rating: 2
No "V" engine is inherently balanced, which is why the crankshaft is weighted to deal with the issue.

However, I find it funny that you claim V6 are better since they are the absolute worst. There is a fundamental harmonic difference with the two banks of 3 cylinders working on a 4 cycle engine. A V4 (rare) or V8 can accomplish that much better than a V6 can. A V6 will always be the most unstable and unbalanced, which translates into vibration harshness. Smooth V6s accomplish that by adding balance shafts, which rob power. A V8 will provide better NVH, along with better power across all bands, all else equal.

Coupled with your other comments as a whole, you have know idea what you are talking about.


By Jeffk464 on 9/4/2012 4:22:20 PM , Rating: 2
A lot of the "smoothness" people associate with todays engines has to do with liquid filled mounts and sound deadening material around the firewall.


By Alexvrb on 9/5/2012 12:12:27 AM , Rating: 2
Don't forget new electronically actuated "active" mounts. They do work fairly well, but the idea of mounts that can potentially cause a vacuum leak just annoys me. Even more so than jelly (hydraulic) mounts leaking out. Plus they're even more expensive than even hydraulic mounts and have added electronics, wiring, and PCM control to go with them.

"Fake" automotive components I can no longer joke about: Exhaust fluid, computer-controlled engine mounts. Still OK: Blinker fluid, muffler bearings, winter air (for tires).


By sorry dog on 9/4/2012 10:13:15 PM , Rating: 2
V12 is. Think of it as 2 inline six's sharing a crank.


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