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, vtech in cars. If you don't, here's an explainer. VTEC is a type of variable valve-timing system developed and used by Honda.

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.

However, beginning with the J37A2 3. The drum will only rotate to advance or retard the position of the secondary rocker arms, vtech in cars, to take advantage of their varying profiles. Contents move to sidebar hide.

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Take a look at any modern Honda car and you will likely notice the word "VTEC" etched on it somewhere. You may have even heard of the meme "VTEC just kicked in. So what is it, and why does it set Honda apart? That mouthful means that cars with VETC can "extract maximum horsepower and torque from smaller displacement engines without using turbocharging," according to Honda. Despite its relatively small 1. As for how it actually works, it's a marvel of automotive engineering.

Vtech in cars

But, what is VTEC? Glad you asked. Since its inception, VTEC technology has evolved, becoming synonymous with delivering enhanced engine performance and fuel efficiency.

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The effect is further optimization of torque output, especially at low and midrange RPM. However, the valvetrain has the added benefit of roller rockers and VTC continuously variable intake cam timing. Duration refers to how long the valve is kept open. At RPM, the second VTEC solenoid engages both solenoids now engaged so that both intake valves are using a middle, third camshaft lobe. With the introduction of i-VTEC the systems gained infinitely variable valve timing but still only staged lift i. The camshaft is surrounded by a partially open drum which has secondary rocker arms attached to it via a pivoting point. Aichi Prefecture. At higher engine speeds, the cam profile allows greater valve lift, which allows more air into the cylinder. Archived from the original on 28 March The engine is able to run on 3, 4, or all 6 cylinders based on the power requirement, essentially getting the best of both worlds. For other uses, see VTEC disambiguation. Template Category Commons. With these two technologies combined Honda has developed an infinitely variable valve timing and lift system "VVTL". Most variable valve-timing systems use increased oil pressure to shift the timing of the camshaft, opening the valves earlier; VTEC uses an entirely different set of cams at high RPMs. Download as PDF Printable version.

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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. At higher RPM, both intake valves run off the larger intake cam lobe, improving total air flow and top-end power. Download as PDF Printable version. Rather, it refers to the rocker arm which contains the VTEC switching piston and receives oil from the rocker shaft. As the engine begins to spin more quickly, the center lobe takes over and the valves open sooner and closer later, which results in a sudden burst of speed and better performance. Honda Motor Company. The engine is able to run on 3, 4, or all 6 cylinders based on the power requirement, essentially getting the best of both worlds. Fury Without Sound. 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. Most variable valve-timing systems use increased oil pressure to shift the timing of the camshaft, opening the valves earlier; VTEC uses an entirely different set of cams at high RPMs.