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Ford Using Ti-VCT in New 5.0L V8 for Mustang GT

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The 400hp naturally-aspirated 5.0L is the current high-end application of Ti-VCT in the Ford lineup. Click to enlarge.

Ford has officially announced the 2011 Ford Mustang with an all-new advanced naturally-aspirated 5.0-liter V-8 engine. The 5.0-liter four-valve Twin Independent Variable Camshaft Timing (Ti-VCT) V-8 engine in the new Mustang GT will deliver 412 hp (307 kW) and 390 lb-ft (529 N·m) of torque.

The Ti-VCT technology (earlier post) is a key element in helping the new 5.0-liter V-8 Mustang GT deliver projected fuel economy of up to 25 mpg US on the highway cycle—better than the pervious model—despite its performance. The gasoline (91 octane recommended, 87 octane minimum) engine offers a specific output of 82.4 hp/L. An additional benefit of Ti-VCT is a reduction of emissions, especially in situations when the throttle is partially open.

Ti-VCT provides extremely precise variable—yet independent—control of timing for intake and exhaust valves. Independent adjustment of intake and exhaust valve timing allows maximum fuel economy at part-throttle, while delivering optimized power in full-throttle situations. An added benefit is improved drivability and responsiveness across the torque curve.

Ford intends to make Ti-VCT—which now ranges in announced applications from the 1.6L on the Ford Fiesta up to this 5.0L in the Mustang—available on 90% of its nameplates by 2013, according to Barb Samardzich, vice president, Powertrain Development. (Earlier post.)

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The 2011 Mustang GT. Click to enlarge.

The new 5.0-liter V-8 in the 2011 Mustang GT is a double-overhead-camshaft configuration that employs two camshafts per cylinder bank—one camshaft to operate the intake valves and one camshaft to operate the exhaust valves. Ti-VCT rotates the camshafts to advance or retard the cam timing, based on several measures including throttle opening.

Working like a ratchet, the one-way valves allow precise timing of camshaft events, continually optimizing timing to provide maximum thrust or fuel economy, based on driver input.

An element unique to the Mustang GT 5.0-liter V-8 application is that Ti-VCT is actuated by camshaft torque, with assistance from pressurized oil. This meant that minimal upgrades to the oil pump were required, resulting in less parasitic drag. Increased volumetric and thermal efficiency gives faster Ti-VCT response at all engine speeds. Camshaft torque energy Ti-VCT actuation is a Ford innovation, introduced first on the 3.0-liter V-6.

During the development phase, camshaft lift profile and port optimization started with higher-lift Ford Racing aftermarket units, modified for compatibility with various four-valve-per-cylinder heads. Extensive CAE and dynamometer testing was performed to fine-tune camshaft events and port flow for performance and fuel efficiency in conjunction with the variable camshaft timing.

The resulting all-new aluminum four-valve-per-cylinder heads feature a compact roller finger follower valvetrain layout leaving more room for high-flow ports for free-breathing performance. Head structure was designed to support higher cylinder head pressures and cross-flow cooling for sustained high-rpm use. Head bolt size was increased from 11 to 12 millimeters to contain the higher combustion pressures.

The aluminum block was developed for optimized windage and oil drainback under lateral conditions and high rpm, such as a track-day outing for an enthusiastic owner and driver. Increased main bearing bulkhead widths and nodular iron cross-bolted main bearing caps with upsized bolts were also employed to accommodate the significant performance increase.

An additional element is the increased capacity and baffling of the deep-sump stamped steel oil pan to enable sustained high-rpm use and offer the convenience of 10,000-mile oil change intervals. Piston-cooling jets also were incorporated for performance-minded customers and for faster oil warm-up on cold start.

Specially designed tubular exhaust headers were developed to maximize exhaust pulse separation and improve flow.

The six-speed automatic transmission on the 2011 Mustang GT will deliver up to an estimated 25 mpg US highway and 17 in the city. This is up from 23 mpg US highway and 17 city for the 2010 model. Six-speed manual transmission Mustang GT models for 2011 are projected to deliver 24 mpg highway and 16 city, matching the 2010 model but delivering significantly more horsepower and performance feel.

Other contributors to the 2011 Mustang GT fuel economy are, EPAS (electric power assist steering) and an additional rear decklid seal to enhance aerodynamics.

Fuel economy also is aided by engineering a lightweight powertrain. The engine, as shipped, weighs 430 pounds (105 kg). This represents a weight savings of more than 20% versus the previous 5.0-liter offering. Lower mass can be attributed to the aluminum block and heads, the lightweight composite intake manifold, composite cam covers and hollow camshafts.

Comments

Stan Peterson

Theoretically, diesel engines could be as clean as spark ignitiion ICEs have proven to be. There are no PZEV compliant diesels anuywhere; not even in any documented laboratory. The cleanest diesel documented by the SAE, was an effort by Nissan that barely met T2B4 standards. To accomplish such poor cleanliness, the chemical factory in the diesel's exhaust stream cost more than a complete diesel vehicle.

Please desist form bragging about the phony upcoming EU VI diesel standards. They are just plain dirty, and a phony future standard, existing to provide an official fig leaf to EU automakers. Such EU complaint diesels, in 2015, would still be 90 to 100 times dirtier, than US diesels meeting the still dirty, but somewhat cleaner, but US legal T2B5 standard, today.

I see many posters on these pages brag about diesels. I would not be proud to be motoring down a street producing more pollution than the combined exhausts of between 100-1000 other cars around me. The pollution might not be as visible, but it is there the same, as if you drove an oil-burner, belching blue smoke in vast quantities behind you as you drive.

How many would be proud to be doing so, and even advocating others to do exactly that?

Why would you want the air in your city to be made dirtier and more unhealthy for all, after we have worked so hard to clean it up, including poisoning your own children?

Alex Nigro

Wow, the eco-thuggery is in full force here. You know what? I want one. I want one bad. I don't want hi-po cars to be outlawed because Greenpeace says so. With Aston Martin rebadging a Toyota city car to keep up with the draconian EU regulations, and Ferrari talking hybrids, I fear for the future.

If you're sneering at Ford for building a car people actually want, instead of battery-powered hopes and dreams, stop. Don't tread on me or the millions of Mustang fans. Who cares if it's politically incorrect? Let us enjoy the drive, cars can't be appliances to go from point a to b all the time.

Will S

Alex wrote:

"I fear for the future."

Bush said "America is addicted to oil". You are proving his point. Kick the habit and be part of the solution, vs. part of the problem.

Alex Nigro

Will, why do you think that you know what I want best? I don't want a car that runs on unicorn farts and rainbows. Why do you want to curbstomp a kid's dream here?

It's eco-thugs like you who think that they know best that makes me want to vote Libertarian...

Will S

Alex wrote;

"Will, why do you think that you know what I want best? "

This is absolutely hysterical! "I want, I want..."

No wonder "America is addicted to oil". Spoiled brats think that petroleum grows on trees and they have an endless right to it.

Alex, this isn't "Muscle Car Congress", it's Green Car Congress. You've wandered into the fast lane on the internet and are hopelessly befuddled about where you are. If you don't like talk about green cars, then why are you here??

ToppaTom

Uh, Will, did you notice the title of this article?

It says "Ford Using Ti-VCT in New 5.0L V8 for Mustang GT"./

And the text, not surprisingly, discusses positively, a 5.0L V8 and a Mustang GT.

Will S

Uh, TT, the most 'positive' sentence about this Mustang was;

"The Ti-VCT technology (earlier post) is a key element in helping the new 5.0-liter V-8 Mustang GT deliver projected fuel economy of up to 25 mpg US on the highway cycle"

Not really anything to write home about.

Ford is making this available in other models;

"...make Ti-VCT ...available on 90% of its nameplates by 2013"

Ford's bragging about 25 mpg is targeted at those who continue to be "addicted to oil" and the sub-culture that surrounds it, especially those who "fear for the future" when muscle cars will forever lose their appeal...

ToppaTom

Uh, Will, did you notice this isn't "Muscle Car Congress".

Will S

I'm not the one confused about that...

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