• Honda Civic Vtec
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• Honda Vtec Engine Diagram

©2019 American Honda Motor Co., Inc. The Civic was available in three variants, a 4-door compact sedan, a 5-door hatchback, and a 2-door coupe (sharing the same platform as the sedan). Under the hood was a SOHC 1.8-liter 4-cylinder featuring Honda’s I-VTEC technology. Compared to earlier models, the 140-HP it produced was impressive.

What exactly is Honda's i-VTEC technology. Ask Question. I see that almost all of Honda's cars have an 'i-VTEC' logo at the back. I googled it and came to know that it has something to do with different cam profiles. Can someone explain? A diagram or animation would be helpful. Here's are two videos showing in depth inner-workings of the. The 2020 Honda Civic Coupe is our most sophisticated 2-door coupe to date. With a new sport trim and aggressive stance, it’s ready to scorch the pavement. Official Owners Manual for Honda from the Honda Owners Site. Vehicle Info. To save paper and time, you can download the latest manuals now. Warranty Booklet. The Owner’s Manual has detailed information about the coverage and terms of your warranties including. Checkout Honda CRV (2012-2017) 2.4 I-VTEC AT price Rp 452,5 Million. CRV (2012-2017) 2.4 I-VTEC AT available in Petrol option. Explore October promo & loan simulation, know how is it different from other variants by comparing specs, mileage, expert reviews, safety features at Oto!

If you have read How Car Engines Work, you know about the valves that let air into the engine and let exhaust out of the engine. You also know about the camshaft that controls the valves. The camshaft uses rotating lobes that push against the valves to open and close them. Check out How Camshafts Work for more information.

It turns out that there is significant relationship between the way the lobes are ground on the camshaft and the way the engine performs in different rpm (rotations per minute) ranges. To understand why this is the case, imagine that we are running an engine extremely slowly -- at just 10 or 20 rpm, so it takes the piston seconds to complete a cycle. It would be impossible to actually run a normal engine this slowly, but imagine that we could. We would want to grind the camshaft so that, just as the piston starts moving downward in the intake stroke, the intake valve would open. The intake valve would close right as the piston bottoms out. Then the exhaust valve would open right as the piston bottoms out at the end of the combustion stroke and would close as the piston completes the exhaust stroke. That would work great for the engine as long as it ran at this very slow speed.

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足W足hen you increase the rpm, however, this configuration for the camshaft does not work well. If the engine is running at 4,000 rpm, the valves are opening and closing 2,000 times every minute, or thirty to fourty times every second. When the intake valve opens right at the top of the intake stroke, it turns out that the piston has a lot of trouble getting the air moving into the cylinder in the short time available (a fraction of a second). Therefore, at higher rpm ranges you want the intake valve to open prior to the intake stroke -- actually back in the exhaust stroke -- so that by the time the piston starts moving downward in the intake stroke, the valve is open and air moves freely into the cylinder during the entire intake stroke. This is something of a simplification, but you get the idea. For maximum engine performance at low engine speeds, the valves need to open and close differently than they do at higher engine speeds. If you put in a good low-speed camshaft, it hurts the engine's performance at high speeds, and if you put in a good high-speed camshaft it hurts the engine's performance at low speeds (and in extreme cases can make it very hard to start the engine!).

VTEC (which stands for Variable Valve Timing and Lift Electronic Control) is an electronic and mechanical system in some Honda engines that allows the engine to effectively have multiple camshafts. As the engine moves into different rpm ranges, the engine's computer can activate alternate lobes on the camshaft and change the cam's timing. In this way, the engine gets the best features of low-speed and high-speed camshafts in the same engine. Several of the links below go into the actual mechanics of the VTEC system if you are interested.

Several engine manufacturers are experimenting with systems that would allow infinite variability in valve timing. For example, imagine that each valve had a solenoid on it that could open and close the valve under computer control rather than relying on a camshaft. With this type of system, you would get maximum engine performance at every rpm range. Something to look forward to in the future..

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iVTEC How it Works is a long standing requested video. Back with I did the video on the VTEC explanation I was asked about doing a video on iVTEC which is slightly different than VTEC. First you need to understand the basic operation of the cam shaft, once you have that, and you know a little about how that cam shaft effects performance, you can then begin to understand how iVTEC works. In essence, as far as the Honda system is concerned, it varies the cam 'timing' to optimize performance and fuel economy. Many companies employ similar systems to this but they may perform the operation differently. This video focuses on the Honda iVTEC system.

That said, you may notice that the VTEC system on this K series is a little different in that instead of having a cam with a higher lift and duration, it switches between 1 and 2 valves on the intake side. So when VTEC engages on this engine it actually activates another valve in the cylinder instead of changing lift and duration. It still alters cam timing via the iVTEC system however. Once again, to optimize power output and fuel economy.

Either way, I hope this video helps with your understanding of camshafts, cam timing, lift, duration, VTEC, and iVTEC systems.

Thanks for watching.
The best place for answers to your automotive questions: http://www.ericthecarguy.com/

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Honda Civic Vtec

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