Test drive anatomy of a high-tech engine: Infiniti V6 Twin Turbo
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Test drive anatomy of a high-tech engine: Infiniti V6 Twin Turbo

Test drive anatomy of a high-tech engine: Infiniti V6 Twin Turbo

The three-liter unit is a direct relative of the Nissan GT-R engine

The three-liter twin-tube V6 petrol engine, first seen in the new Q60 Coupe, has the daunting task of replacing the now iconic 3,7-liter V6 VQ37. The new generation car, codenamed VR (in this case VR30 DDTT) and according to Infiniti, is the most high-tech motorcycle ever produced and offered by the company.

Причины уменьшения рабочего объема не только в тенденциях к уменьшению габаритов и переходу на турбонаддув, но и в конструкции цилиндров, оптимальных с точки зрения рабочего объема. Как коллеги из Mercedes и BMW, Конструкторы Infiniti используют цилиндры объемом 0,5 литра, которые считаются наиболее подходящими для процесса сгорания.

Two versions of the engine are available to buyers, respectively, with a capacity of 304 and 405 hp. Despite the significant difference in power, from a mechanical point of view, there are no significant differences between them - the mounting supports are different, moreover, a more powerful unit has two instead of one water pump.

Optical sensors track the rotation of the turbine wheel, which reaches 240 rpm in transient conditions. Shosaki Ando, ​​head of Infiniti's powertrain division, said the goal was to achieve both high horsepower and quick engine response, which is difficult given the need for larger turbochargers. The more powerful version reaches 000 hp. at 405 rpm and has a maximum torque of 6400 Nm in the range from 475 to 1600 rpm, in the version with 5200 hp. torque 304 Nm.

The architecture of the aluminum block from the so-called. A "square type" with the same stroke and piston diameter is a good compromise between low friction and high RPM capability. Variable valve opening and direct fuel injection phases are added to the equation. The design layout is also part of the demand for higher efficiency - the two turbochargers are mounted directly on the cylinder heads, which in turn have integrated exhaust manifolds. In this way, faster reaction of the turbines is achieved, the gases heat the catalyst faster, the coolant reaches operating temperature faster, and then the temperature of the gases is reduced so as not to subject the turbines to thermal stress. In addition, it significantly reduces the need for enrichment of the mixture at high load. The compressed air intercooling system is of the water-to-air type, has a greater cooling capacity and maintains a more balanced temperature than an air-to-air system. In addition, intercoolers located near the valve covers shorten the compressed air path and speed up the response of the gas supply.

The "Thermal Injection Mirror Coating" applied to the cylinder walls helps not only reduce friction (by as much as 40 percent!), But also reduce weight by eliminating the need for cast iron bushings (this also makes the structure more robust, making it more durable. thickness of the aluminum wall) and for efficient heat dissipation through the aluminum walls. The new engine is manufactured at Nissan's plant in Fukushima, Japan.

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