Vtech in cars

If you're a car enthusiast, you've probably heard the term "VTEC" before, but you might not know what it means. If you don't, here's an explainer. VTEC is a type of variable valve-timing system developed and used vtech in cars Honda. Like most other variable-valve timing systemsVTEC varies oil pressure to shift between different cam profiles.

Gasoline-powered engines require four things to generate horsepower: Air, fuel, compression, and spark. A part of the engine known as the camshaft controls when and how much the valves open and close, and therefore how much air goes into the engine. On this camshaft are raised points known as lobes, which, as the camshaft rotates, will push the valves open and then closed via rocker arms. Larger lobes will open the valves further than smaller ones. If you are interested in knowing about the reasons why your check engine light is on , you can check the guide we created. In an engine, the camshaft is a long rod that normally sits above the cylinder and the piston, and that operates the valves which plug up both an intake channel and an exhaust channel. Your spark plug discharges, allowing the fuel inside to combust, and another rotation opens the exhaust channel as the intake channel is closed, pushing out the exhaust gasses.

Vtech in cars

The VTEC system uses two or occasionally three camshaft profiles and hydraulically selects between profiles. It was invented by Honda engineer Ikuo Kajitani. Japan levies a tax based on engine displacement , [3] and Japanese auto manufacturers have correspondingly focused their research and development efforts toward improving the performance of their smaller engine designs. One method for increasing performance into a static displacement includes forced induction , as with models such as the Toyota Supra and Nissan ZX which used turbocharger applications and the Toyota MR2 which used a supercharger for some model years. A third option is to change the cam timing profile, of which Honda VTEC was the first successful commercial design for altering the profile in real-time. The switching operation between the two cam lobes is controlled by the ECU which takes account of engine oil pressure, engine temperature, vehicle speed, engine speed and throttle position. Using these inputs, the ECU is programmed to switch from the low lift to the high lift cam lobes when certain conditions are met. At the switch point a solenoid is actuated that allows oil pressure from a spool valve to operate a locking pin which binds the high RPM rocker arm to the low RPM ones. From this point on, the valves open and close according to the high-lift profile, which opens the valve further and for a longer time. The switch-over point is variable, between a minimum and maximum point, and is determined by engine load. The switch-down back from high to low RPM cams is set to occur at a lower engine speed than the switch-up representing a hysteretic cycle to avoid a situation in which the engine is asked to operate continuously at or around the switch-over point. The older approach to timing adjustments is to produce a camshaft with a valve timing profile that is better suited to low-RPM operation. The improvements in low-RPM performance, which is where most street-driven automobiles operate a majority of the time, occur in trade for a power and efficiency loss at higher RPM ranges. In the regular four-stroke automobile engine, the intake and exhaust valves are actuated by lobes on a camshaft. The shape of the lobes determines the timing, lift and duration of each valve.

At Digital Trends, he's….

.

Automobiles keep evolving day by day. One of these features is the VTEC. It adds extra power without a turbocharger or supercharger. Though VTEC was first seen in a Honda Integra, it is still an incredible feature worth giving an accolade every time. So, what is VTEC, anyway? But what the heck is it?

Vtech in cars

The VTEC system is a valvetrain system that allows engines to achieve higher power and efficiency by optimizing the timing and lift of the intake and exhaust valves. The system works by having two sets of camshaft profiles for each cylinder, with one set designed for low-speed operation and the other set for high-speed operation. At low speeds, the camshaft profiles provide a low lift and duration, which maximizes fuel efficiency and reduces emissions. The VTEC system uses a solenoid to control oil pressure, which in turn, operates a locking pin that connects the low-speed camshaft profile with the high-speed camshaft profile. When the engine reaches a certain RPM, the solenoid sends oil pressure to the locking pin, which engages and locks the high-speed camshaft profile with the low-speed camshaft profile. This causes the valves to open further and for a longer period, which improves airflow into and out of the engine, resulting in more power. The i-VTEC system uses a camshaft profile that continuously varies the valve lift and timing, providing optimal performance across a wider range of engine speeds. The VTC actuator uses hydraulic pressure to rotate the camshaft, allowing for a continuously variable valve timing system. By allowing engines to operate efficiently across a wide range of driving conditions, they have provided drivers with increased performance, better fuel economy, and lower emissions. As these technologies continue to evolve, we can expect even greater advances in automotive engineering in the years to come.

Suigetsu x sasuke

For other uses, see VTEC disambiguation. Initial implementation for European vehicles included 2-litre 4-cylinder turbocharged engine used from Honda Civic Type R until present, which included Euro 6 emissions compliance. Now hybrid powertrains can be found in everything from high-end supercars to humble taxis, and even in commercial vehicles. The two types of engines are easily distinguishable by the factory rated power output: the performance engines make around hp kW or more in stock form, while the economy engines do not make much more than hp kW. Ed Oswald. VTEC-E is the first version of VTEC to employ the use of roller rocker arms and because of that, it forgoes the need for having 3 intake lobes for actuating the two valves—two lobes for non-VTEC operation one small and one medium-sized lobe and one lobe for VTEC operation the biggest lobe. Although new and late-model cars are generally reliable, there's no guarantee that they won't break down at the worst possible time. Watch Next. Honda incorporated the technology into the NC series, including the NCD Integra , released in , using a single camshaft to provide two timing routines for the intake valves. Because of this, at low RPM, when VTEC is not engaged, one of the two intake valves is allowed to open only a very small amount due to the mild cam lobe, forcing most of the intake charge through the other open intake valve with the normal cam lobe. At lower rpm, only the outer lobes are controlling the valves. What is a hybrid car?

If you're a car enthusiast, you've probably heard the term "VTEC" before, but you might not know what it means. If you don't, here's an explainer. VTEC is a type of variable valve-timing system developed and used by Honda.

The system electronically deactivates cylinders to reduce fuel consumption. These secondary rocker arms, which have a varying depth profile similar to cams , are directly actuated by the camshaft, in a scissor-like manner. Honda Motor Co. For other uses, see VTEC disambiguation. The switch-over point is variable, between a minimum and maximum point, and is determined by engine load. The effect is further optimization of torque output, especially at low and midrange RPM. With these two technologies combined Honda has developed an infinitely variable valve timing and lift system "VVTL". VTEC is a type of variable valve-timing system developed and used by Honda. Honda's advanced VTEC technology departs greatly from its previous incarnations by no longer relying on switching between two sets of lobes on a given camshaft. Ford 7. Archived PDF from the original on Optimal low RPM valve timing lift and duration settings would result in insufficient filling of the cylinder with fuel and air at high RPM, thus greatly limiting engine power output. This helps generate more horsepower. The same occurs for the intake rocker shaft, except that the high-profile camshaft lobe operates the primary rocker arm.