How To Tell If Vtec Is Working
Honda developed its Variable Valve Timing & Lift Electronic Control (VTEC) applied science to make its cars quicker, more than efficient, and more enjoyable to drive overall. The applied science's frequent appearance in Fast and Furious movies has turned information technology into a widely known meme. Many have heard the phrase "VTEC just kicked in, yo!" but few know how information technology works. Here's what you lot demand to know near the system.
Engine nuts
Gasoline-powered engines require four things to generate horsepower: Air, fuel, pinch, and spark. For the purposes of understanding the VTEC system, we'll focus mainly on the air part of that equation. A office of the engine known as the camshaft controls when and how much the valves open and shut, and therefore how much air goes into the engine. On this camshaft are raised points known equally lobes, which, every bit the camshaft rotates, will push the valves open and so closed via rocker arms. Larger lobes will open up the valves farther than smaller ones.
Unless you lot're familiar with engine internals, you might accept gotten a bit lost in that last paragraph, and so let's define both what camshafts and valves are, and give y'all a crash course on how an engine works.
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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 aqueduct and an exhaust channel. One rotation opens the intake aqueduct, assuasive fuel and air into your engine'south cylinders. 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.
During this procedure, the pistons move upwardly and down in the cylinders. Engines can use either one or two camshafts, and they're driven either by a timing chain or a timing belt.
The below video explains what we just talked about (kickoff at most 49 seconds).
Quite a few variables command how an engine produces the ability needed to make a automobile motion. More air into the engine means more power, since the combustion process is accelerated, only also much of it isn't necessarily a good thing. The procedure of opening and closing the valves that we just described works well at low revolutions per infinitesimal (rpm), simply the valves open and close and then rapidly equally the engine builds upward speed that operation ultimately starts suffering.
How VTEC is different
Honda'southward Australian division published the video below to explain how its VTEC applied science works. We propose you watch it earlier reading the rest, considering it will help our explanation make a whole lot more than sense.
In a traditional engine, the camshaft opens and closes the valves, and its lobes are all the same size. In Honda's VTEC engine, the camshaft has ii different lobe sizes: Two standard-sized outer lobes and a larger middle lobe. At lower rpm, only the outer lobes are controlling the valves. As the engine begins to spin more than quickly, the center lobe takes over and the valves open sooner and closer later, which results in a sudden flare-up of speed and better performance.
This modify too causes the engine to have a sudden change in pitch — that's "VTEC kicking in."
Does VTEC actually do anything?
Yes and no; it depends on how you lot drive. Honda cars equipped with VTEC technology tend to be more efficient across a wider rpm range than many comparable vehicles, and they're a lot of fun to drive in the correct atmospheric condition, but about motorists won't notice their VTEC boot in. It's active when the engine is operating relatively high in the rev range, and yous rarely get in that location in normal driving conditions, especially if your car has an automatic manual. Simply, if you're the shift-your-own-gears type and you like twisty roads, VTEC makes a noticeable divergence.
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Source: https://www.digitaltrends.com/cars/how-vtec-works/
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