Vtech in cars

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, 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.

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 by Honda. Like most other variable-valve timing systems , VTEC varies oil pressure to shift between different cam profiles. At higher engine speeds, the cam profile allows greater valve lift, which allows more air into the cylinder. This helps generate more horsepower. But the way VTEC goes about switching cam profiles is totally distinct. 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. Explaining the process with words alone doesn't do it justice. If you want to know what happens inside the engine, definitely give this clip a watch. As Fenske explains, VTEC-equipped engines have two rocker arms with their own low-profile cams for each cylinder, and a central rocker arm with its own high-profile cam, which is unused at low RPMs. As engine speeds rise, a piston inside the rockers is pressurized with oil, locking all three cams together to increase valve lift. This is where that signature "VTEC kicking in" sound comes from. Now next time you "get into VTEC" while driving your Honda, you'll know exactly what's happening inside your engine. He also has a taste for high-mileage, rusted-out projects and amateur endurance racing.

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. Honda also applied the system to SOHC single overhead camshaft engines such as the D-Series and J-Series Engines, which vtech in cars a common camshaft for both intake and exhaust valves.

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But, what is VTEC? Glad you asked. Since its inception, VTEC technology has evolved, becoming synonymous with delivering enhanced engine performance and fuel efficiency. It's time to take a closer look at Honda's benchmark system. If you have read How Car Engines Work , you know a bit about the intake and exhaust valves that let air into and out of the engine. You may also know about the camshaft that controls the valves. In short, the camshaft uses rotating lobes that push against the valves to open and close them.

Vtech in cars

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.

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The dwell of the valves remains unchanged, as in the automobile VTEC-E, and little extra power is produced, but with a smoothing-out of the torque curve. The drum will only rotate to advance or retard the position of the secondary rocker arms, to take advantage of their varying profiles. Advertisement - Continue Reading Below. The camshaft is surrounded by a partially open drum which has secondary rocker arms attached to it via a pivoting point. Both intake and exhaust cams have three cam lobes per cylinder. Template Category Commons. Archived from the original on 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. VTEC implementation on the exhaust rocker arms causes the turbo to be spooled quicker, eliminating turbo lag. The VTEC system uses two or occasionally three camshaft profiles and hydraulically selects between profiles.

Automobiles keep evolving day by day. One of these features is the VTEC.

What is a hybrid car? Hidden categories: Webarchive template wayback links Articles with short description Short description is different from Wikidata All articles with unsourced statements Articles with unsourced statements from August Articles needing additional references from July All articles needing additional references Articles with unsourced quotes. If you want to know what happens inside the engine, definitely give this clip a watch. Watch Next. Rather, it refers to the rocker arm which contains the VTEC switching piston and receives oil from the rocker shaft. In a traditional engine, the camshaft opens and closes the valves, and its lobes are all the same size. The term "primary" does not refer to which rocker arm forces the valve down during low-RPM engine operation. These secondary rocker arms, which have a varying depth profile similar to cams , are directly actuated by the camshaft, in a scissor-like manner. The ideal engine would have fully variable valve timing, lift and duration, in which the valves would always open at exactly the right point, lift high enough and stay open just the right amount of time for the engine speed and load in use. When the first hybrid cars hit showrooms roughly two decades ago, they were dismissed as science projects. 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. The primary rocker arm contains the VTEC switching piston, while the secondary rocker arm contains the return spring.