Dohc Off Road

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The Armada, Nissan's full-size SUV, returns for 2010 with no changes to its standard V8 engine.

The Armada's 5.6-liter, 32-valve DOHC engine is known as the VK56DE. Based on the layout of Nissan's VQ-series V6, it is a 90-degree V8 with an aluminum block and heads, iron cylinder liners, forged steel connecting rods, and molybdenum-coated pistons to reduce internal friction. It uses Nissan's Continuously Variable Valve Timing Control System (CVTCS) on the intake valves, with a variable intake manifold to improve low-end torque. Designed specifically for truck and SUV use, the VK56DE engine is shared by the Nissan Pathfinder, Titan, and Infiniti QX56. In the Armada, it produces 317 horsepower and 385 lb-ft of torque.

When the Armada debuted in 2004, its 5.6-liter V8 was the most powerful engine in its class, and it gives the Armada strong acceleration and passing power. Rivals like the Chevrolet Tahoe and Toyota Sequoia now offer similar power, but the Armada still has class-leading towing capacity of up to 9,100 pounds. The VK56DE engine is smooth, but never entirely quiet. Some critics like its burbling exhaust note and throaty roar, but others find it too noisy.

Predictably, the big V8 is thirsty, even by full-size SUV standards. EPA estimated fuel economy is only 12/18 city/highway, which reviewers say is optimistic. Unlike the more highly tuned version of this engine in the Infiniti QX56, the Armada uses regular fuel.

In certain Midwestern, Southern, and Southeastern markets, Nissan offers a flexible-fuel version of this engine, capable of running on either gasoline or alternative fuels like E85, a blend of 85% ethanol and 15% gasoline. According to the EPA, using E85 reduces greenhouse gas emissions by up to 23%, but makes the 5.6-liter engine thirstier than ever. EPA fuel economy estimates on E85 are a dismal 9/13.

See more information about Nissan Armada Engine and other industry topics.

Evolution of Maruti Suzuki Swift

In the present, Maruti Suzuki Swift is one of the fastest growing cars in the Indian car market. Since its inception in the country, the car has won various awards, appreciation, and accolades from across the global car industry. It is also known to break the records of the Indian automotive heritage by becoming the first Indian Car of the Year. Swift has also acquired many other awards for its excellence in all aspects. Some of the most renowned awards include Best Value for Money Cars by CNBC Autocar, Design Car of the Year by BBC Top Gear, Small Car of the Year by NDTV Profit, No. 1 in Initial Quality Study by J.D.Power, Total Customer Satisfaction by TNS Study, and the list goes on.

 

Fondly, the Swift was introduced at a period when customers were actually not satisfied with the premium hatchbacks present in the Indian car industry. Maruti took the advantage and rolled out its most fascinating hatchback, Maruti Suzuki Swift, with advanced and innovative car features including advanced car safety technologies.

 

The radical innovation of Swift dates back to 1999 when Suzuki had introduced a motorcycle christened as Hayabusa, the world’s fastest superbike, with a 1.3L DOHC engine with unbeatable power and performance. This was then conceptualized to a car, GSX-R/4, that took the engine of the Suzuki’s motorcycle. Powered with the same DOHC engine the car was unleashed onto roads in 2001.

 

Thereafter, this car was transformed into another concept known as Concept S. In the year 2004, a new, highly technological and rally inspired car was unveiled at Paris Auto Show. The technology then moved further to concept S-2 an open-top convertible that introduced an era of new driving experience in 2003.

 

Finally, concept S-2 was transformed to introduce the present day Swift with bigger and greater potential. It was introduced with European standards as their benchmarks coupled with an advanced chassis, transmission, and suspension system. It was designed by a team of 21 Indian designers and engineers who carefully analyzed and studied the dimensions, designs, qualities, style, and performance of the concept S-2 car and created a new path to roll out a ground breaking hatchback.

 

After several months of efforts and challenges, they introduced a smiling Swift to sparkle the Indian car industry. The car market welcomed the scintillating Swift in 2004 but even further innovations and evolution was in continuation. Maruti moved a step ahead and evolved a new revolutionary Swift diesel that has also created its own benchmark.

 

Swift has definitely rolled out on roads but advancements and innovations will always move in pace with the time span to accommodate new, better, and functional features in the Swift.

 

With the launch of Swift in the Indian car market, Maruti Suzuki has reaffirmed its stature as market leaders in the compact car segment.

 

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Any Mazda experts out there?

2000 Mazda 626, 2.0L, DOHC, 4 cyl, automatic.
Runs down the road fine. Everything's normal when the engine is off idle.
Problem: Very rough idle and stalls - in or out of gear.
Compression good, tune up items good, no fault codes in computer.
Throttle body clean, EGR checks OK, idle air bypass checks OK, TPS checks OK, no vacuum leaks found.
Engine starts right up and immediately starts to slow down from 1000 rpm's until it hovers around 5 or 6 hundred, starts shaking and generally stalls within a minute. Consistently gets real rough and stalls at a stop in gear in 10 or 20 seconds unless the throttle is feathered.
I just priced out a few of the items that I thought might be suspect and got a whole new "appreciation" of Mazda - the idle air valve, for instance, is around $500! This is definitely not a vehicle to be replacing parts on a hunch.
Any help or tips are appreciated. Thanks.

Couple things for you to try, When running take the vac. line off the EGR and observe what happens.Also put vac. on the EGR with a pump just to cycle it makes sure you can turn it on and off with mechanical vac. pump. Also take carb. cleaner and spray around any vac. related lines or seals and look for a hesitation if it starts to stall you found a leak, repair as needed.You could also get a can of MAF cleaner and clean the MAF. Also try unplugging the MAF if it runs better you have a bad MAF sensor or dirty sensor.You could also do an exhaust back pressure test.Just remove an oxy.sensor, your pressure should be below 5psi. If your high remove exhaust at a connection point after your test port and re test.The test should be run at idle and 3,000rpm.Good luck and I hope this helps.

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