Logo rotaautoservice.com
Category: Automakers

Two Nozzles, Four Valves

2024

Video: Two Nozzles, Four Valves

Video: Two Nozzles, Four Valves
Video: 2″ vs 2-1/2″ Hose/Nozzle Comparison - Brass Tacks & Hard Facts (Episode 12) 2024, March
Two Nozzles, Four Valves
Two Nozzles, Four Valves
Anonim

An interesting gasoline 3.5-liter engine, working in tandem with an electric motor, remained behind the scenes.

Every extra kilogram of a car, as you know, worsens its dynamic characteristics, requires additional fuel, and increases harmful emissions. The block and cylinder head, valve cover, crankcase, as well as the connecting rod and piston liners of the new V6 are made of light alloys. Pistons - made of high strength forged steel. Modern technologies and materials have allowed not only to reduce weight, but also to reduce the size of the motor. The original installation of cast-iron sleeves in an aluminum block by 11.5 mm reduced the distance between the cylinders. The concern about additional units was removed from the gasoline engine, in particular, the hybrid car does not have the usual alternator and starter, and the air conditioning compressor and power steering are electric.

Image
Image

The Dual VVT-i stepless phase change system has also contributed to the environment, economy and power performance - it controls the camshafts, shifting the opening timing of the intake valves by 60 ° and the exhaust valves by 35 °. Naturally, the operation algorithm is consistent with the actions of the entire hybrid installation. Say, one of the characteristic features of the motor is the unusually long opening of the intake valves.

Not overlooked and the exhaust system. Firstly, the collector made of heat-resistant stainless steel was made two-layer - they reduced noise. In addition, catalytic converters warm up faster, which improves environmental performance during cold start. Secondly, both mufflers were equipped with flow control dampers. At low engine speeds, they are covered, exhaust gases fill almost the entire volume of the “tank”, noise is noticeably reduced. When the speed rises and the pressure in the exhaust system rises, the dampers open, the flow goes a short way - the back pressure is less, the power is more.

“Lexus” for the first time on a serial engine tested the “hybrid” power system (D-4S - Direct Injection 4-stroke petrol Superior version), combining the advantages of conventional and direct injection. Torque increases by 7%, fuel consumption is reduced, less harmful substances in the exhaust gases.

For each cylinder "six" - two nozzles. One, in the intake manifold, sprays fuel under a pressure of up to 4 bar, the other delivers gasoline directly to the cylinder - the pressure here is thirty times greater, and the "fuel" shoots precisely into the combustion chamber. Nozzles work on different algorithms. On a cold engine, a low pressure nozzle injects fuel at the beginning of the intake stroke. At the end of the compression stroke, another nozzle delivers an additional portion of gasoline, enriching the mixture around the spark plug. With such a layer-by-layer charge distribution, combustion occurs at higher temperatures than with conventional homogeneous mixture formation, and exhaust gases warm up the neutralizers faster to operating temperature. In addition, the engine runs on lean mixtures - the ratio of air to fuel in the cylinder ranges from 15–16: 1. The hybrid unit control unit maintains optimal revolutions of the gasoline unit, reducing harmful emissions. With ordinary motors, this number will not work - they do not have an electrical assistant.

Recommended:

New

Pragmatist

FIRMATIC FOR THE PRAGMATIC

Read More
UAZ -452

Through the eyes of the ownerUAZ -452Vladislav KOZKOHaving appeared in 1966, the UAZ-452 from (1985 - 3741) to this day remains almost the only light-duty off-road vehicle in the former Soviet Union. Judge for yourselves: the UAZ-452 is able to overcome snow cover 50 cm thick, move along tank tracks and carry up to 800 kg of cargo

Read More
Editor'S Choice
Best reviews for the week
Popular for the day