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Old 09 Jul 2008, 10:16 pm
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Default Honda V-tech & i-vtech engines?

What is so special about v-tech & i-vtech engines on hondas? How are they different from the regular engines?
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Old 09 Jul 2008, 10:31 pm
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Adjustable timing / lift / cam profiles. Basically once the engine is spinning past a certain number of revolutions / minute, it shifts into a mode that allows it to make better use of its fuel and air at that higher speed.Regular VTEC will either be engaged or not engaged, while i-VTEC is a variable system - it can be working 'a little' or 'a lot' depending on how fast the engine is running. Honda has VTEC systems in use to increase performance as well as improve fuel economy. Other manufacturers use similar systems to achieve similar results.































en.wikipedia.org
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Old 09 Jul 2008, 10:46 pm
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all I can tell ya is vtec stands for variable valve timing electronic lift control.
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Old 09 Jul 2008, 11:01 pm
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helps gas mileage on long drives, adds horespower
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Old 09 Jul 2008, 11:16 pm
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VTEC (Variable Valve Timing and Lift Electronic Control) is a valvetrain system developed by Honda to improve the volumetric efficiency of a four-stroke internal combustion engine. This system uses two camshaft profiles and electronically selects between the profiles.VTEC serves as another method to derive very high specific output from lower displacement motors. In other words you dont need a turbo or supercharger to get some real balls out of a naturally aspirated small motor.
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Old 09 Jul 2008, 11:31 pm
Teg Teg is offline
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VTEC (Variable Valve Timing and Lift Electronic Control) is a valvetrain system developed by Honda to improve the volumetric efficiency of a four-stroke internal combustion engine. This system uses two camshaft profiles and electronically selects between the profiles. This was the first system of its kind. it helps both fuel economy and perfomance and is truly a wonderful technology honda has brought us.i-vtec is the same thing, however it utilizes the camshaft to advance and move on its own while being driven. think of it this way, vtec is like the tv. the old school tv where it was just black and white. then every other car manufacturer tried jumping on the bandwagon for it cuz it was so good but it took almost 5-7 years for each car manufacturer to come out with it. then when they finally scraped their own vvt technology, I-VTEC came out. now i-vtec is just like the color tv, so now all the car manufacturers are back at the starting line saying "omg wtf? we gotta do this crap again? dang it"honda motors are just so efficient and so great, they compete/match up against higher cylinder cars when honda engines are just usually 4 cylinders. if you're considering buying a new car you should definitely look into getting a vtec engine since it makes the engine much more powerful and is great for fuel economy. good luck
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Old 09 Jul 2008, 11:46 pm
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They do get better gas mileage but as for the hp...oh no...i-vtec engine only has 190 something hp and very low on the torque end
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Old 10 Jul 2008, 12:01 am
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Teg is right for the most part. However, Nissan first introduced electronic variable timing back in 1986 on the 1987 Nissan Pulsar SE with the CA16DE engine and CA18DE from 1988-1989. They also introduced the distributorless igniton on that car as well. Variable valve timing was even introduced to the Nissan 300ZX and 300ZX turbo in 1989 for the 1990 model year- a year before the NSX introduced Honda VTEC technology in 1990. Toyota brought out theirs in 1992 for the 1993 Toyota Supra and Lexus GS300. The difference is that Honda coined the term "VTEC" and marketed it.
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Old 10 Jul 2008, 12:16 am
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VTEC (Variable Valve Timing and Lift Electronic Control) is a valvetrain system developed by Honda to improve the volumetric efficiency of a four-stroke internal combustion engine. This system uses two camshaft profiles and electronically selects between the profiles. This was the first system of its kind. i-VTEC (intelligent-VTEC ) introduced continuously variable camshaft phasing on the intake cam of DOHC VTEC engines. Valve lift and duration are still limited to distinct low- and high-RPM profiles, but the intake camshaft is now capable of advancing between 25 and 50 degrees (depending upon engine configuration) during operation. Phase changes are implemented by a computer controlled, oil driven adjustable cam gear. Phasing is determined by a combination of engine load and rpm, ranging from fully retarded at idle to maximum advance at full throttle and low rpm. The effect is further optimization of torque output, especially at low and midrange RPM.































en.wikipedia.org
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Old 10 Jul 2008, 12:31 am
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1st off: VTEC (no H no hyphen)2nd VTEC is a valvetrain system developed by Honda to improve the volumetric efficiency of a four-stroke internal combustion engine. This system uses two camshaft profiles and electronically selects between the profiles. This was the first system of its kind. Different types of variable valve timing and lift control systems have also been produced by other manufacturers (MIVEC from Mitsubishi, VVTL-i from Toyota, VarioCam Plus from Porsche, VVL from Nissan, etc). It was invented by Honda R&D engineer Ikuo Kajitani. It can be said that VTEC, the original Honda variable valve control system, originated from REV (Revolution-modulated valve control) introduced on the CBR400 in 1983 known as HYPER VTEC.In other words, more power, greater efficiency, less fuel consumption.If you want to read more about it:http://en.wikipedia.org/wiki/VTEC
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