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Old 14 Sep 2007, 05:02 am
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Default What is VTEC?

What does it stand for, what does it do, why does it do it, how does it do it?
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Old 14 Sep 2007, 05:04 am
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variable timing, and its a hydraulicly actuated set of cams that engage to increase high rpm performance. The cams open and close the valves, but can only be optimized for one rpm range, so a second set of cams is hydraulically pushed into place to override the main cam in order to optimize the performance of the engine when the engine is running higher rpms.
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Old 14 Sep 2007, 05:06 am
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vocational Technology
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Old 14 Sep 2007, 05:12 am
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The easiest way to think about it is 'a more controlled supercharger'. VTEC has different positions for the cams and it switches from high to low/low to high rpms depending on driving.
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Old 14 Sep 2007, 05:17 am
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it stands for vet tec which is a veteranirian assistant like a dentists assistant that comes in and cleans your teeth
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Old 14 Sep 2007, 05:18 am
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Variable valve Timing and Electronic lift ControlVTEC is an awesome technology that Honda uses to make their engine more powerful and more fuel efficient than others. If you have an option, go with VTEC, you'll be happier in the end.































en.wikipedia.org
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Old 14 Sep 2007, 05:26 am
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Well the dogzilla guy has almost the right answer...it doesn't have different cams it has has a hydraulically controlled set of rockers that operate on a larger lift for the valves when v-tech is commanded on.
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Old 14 Sep 2007, 05:32 am
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Some of us are old enough to remember stomping on the gas, feeling almost none of the thrust we were hoping for, and hearing the engine go "tack-tack-tack-tack-tack". Those who were mechanically inclined would tinker with the distributor and the valve gaps to keep it from knocking when trying to get a sudden boost of power, but that would always cause the idle to be a little rough and a bit smelly. It was all about getting the timing right -- that is, getting the intake and exhaust valves on each cylinder to open and close in just the right synchronization with the firing of the spark plug to maximize the amount of thrust from each cylinder's firing. The optimal point was somewhere between what would give you a rough idle and having the engine knock while accelerating quickly.VTEC, which stands for Variable valve Timing and lift Electronic Control, handles all that tinkering electronically and on-the-fly. When idling, the timing (both spark and valve setting) is set one way; when accelerating, it's set another way. The result is a smoothly operating engine at all speeds and torque ranges, giving you power when you need it, smooth operation when you don't need power, and a low-emission exhaust - in other words, the best of all worlds. -- Dr. S.































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Old 14 Sep 2007, 05:39 am
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VTEC stands for Variable valve timing with Electronic Control I believe.Essentially this system uses oil pressure to switch between two sets of lobes on the camshaft(s) to allow for reasonable mid-range power without compromising top-end horsepower. Contrary to popular belief it is nothing like a turbo or supercharger nor does it give anywhere near the same gains. It also has not been exclusive to Hondas for a very, very long time. Almost ANY new car you can buy now has some form of variable valve timing. Toyota has VVT-i and others have their own names for it. I think even HYUNDAI offers this now. It is impressive technology but it is commonplace these days.There have been some advancements in this technology over the years, Honda's latest system is called i-VTEC. Toyota now has VVTL-i which is used in Lexus models. Without getting too technical, these newer systems control more parameters, like duration and lift for even better performance gains.Bottom line: VTEC and similar systems make engines more flexible. Before VTEC there had to be a compromise made when the camshaft was designed and most cars focused on mid-range power. Trucks focused on low-end torque and sportscars on high-RPM power. A high-RPM power cam is less than ideal at low RPM and so forth. By having two sets of lobes the compromise is reduced.
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Old 14 Sep 2007, 05:42 am
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all of these anwsers are close but no cigar, vtec is a system on the engine that uses input from the computer, to acuate a the vtec solinoid on the cyl head to allow oil pressure to move a pin on the rocker assembly to lock one intake rocker arm on each cylinder to ride on a seperate lobe on the camshaft that has a different lift and duration on it for better performance above 4000 rpms.
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