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Car Forum / Honda Cars / September 2004I have question about VTEC vs. i-VTEC
I know this is silly, but I notice that the Accord EXV6 have the VTEC and the 4 cyl Accords have the I-VTEC. I ask why this is? Why do you put a more expensive engine like the I-VTEC in the less expensive 4 cyl car? Isn't the I-VTEC better? What is the differerence? Thank you. A simple trip to google and i-vtec would've given you the answer. http://asia.vtec.net/article/ivtec/ http://www.canadiandriver.com/articles/jk/at_011205.htm this is a cut& paste from the canadiandriver.com site Increased performance is one advantage of the i-VTEC system. The torque curve is "flatter" and does not exhibit any dips in torque that previous VTEC engines had without variable camshaft timing. Horsepower output is up, but so is fuel economy. Optimizing combustion with high swirl induction makes these engines even more efficient. Finally, one unnoticed but major advantage of i-VTEC is the reduction in engine emissions. High swirl intake and better combustion allows more precise air-fuel ratio control. This results in substantially reduced emissions, particularly NOx. Variable control of camshaft timing has allowed Honda to eliminate the EGR system. Exhaust gases are now retained in the cylinder when necessary by changing camshaft timing. This also reduces emissions without hindering performance > I know this is silly, but I notice that the Accord EXV6 have the VTEC and > the 4 cyl Accords have the I-VTEC. I ask why this is? Why do you put a more > expensive engine like the I-VTEC in the less expensive 4 cyl car? Isn't the > I-VTEC better? What is the differerence? > > Thank you. Also, the 4cyl is chain driven, while the EXV6 will need it's timing belt change periodically. If I was buying an Accord, I'd go for the better engine... Pars > I know this is silly, but I notice that the Accord EXV6 have the VTEC and > the 4 cyl Accords have the I-VTEC. I ask why this is? Why do you put a more > expensive engine like the I-VTEC in the less expensive 4 cyl car? Isn't the > I-VTEC better? What is the differerence? > > Thank you. Yeah, I did the same when I bought my 2003 Accord. The 4cyl with the i-VTEC is aweseome, especially with a manual shifter. I've heard though that Honda will evently release the K series V6 with the i-VTEC system. That would be an awesome machine. Sean > Also, the 4cyl is chain driven, while the EXV6 will need it's timing > belt change periodically. If I was buying an Accord, I'd go for the [quoted text clipped - 8 lines] > > > > Thank you. It is already available in the Honda Inspire V6 3.0L in Japan. I wouldn't be surprised to see i-VTEC heads on 2006 North American V6 models. > Yeah, I did the same when I bought my 2003 Accord. The 4cyl with the i-VTEC > is aweseome, especially with a manual shifter. I've heard though that Honda [quoted text clipped - 18 lines] > > > > > > Thank you. > I know this is silly, but I notice that the Accord EXV6 have the VTEC > and the 4 cyl Accords have the I-VTEC. I ask why this is? Why do you > put a more expensive engine like the I-VTEC in the less expensive 4 > cyl car? Isn't the I-VTEC better? What is the differerence? > > Thank you. the effect of the swirling is significant i have a predecessor of the i-vtec, the honda civic 1.5 vtec-e in normal use, at constant speed only half of the inlet valves open while accelerating of at higher revs all valves work the effect is great, a smooth powerful engine (115 hp/ 85 kw) and a very low thirst (more then 17 km/liter) marcel > I know this is silly, but I notice that the Accord EXV6 have the VTEC > and the 4 cyl Accords have the I-VTEC. I ask why this is? Why do you > put a more expensive engine like the I-VTEC in the less expensive 4 > cyl car? Isn't the I-VTEC better? What is the differerence? > > Thank you. the effect of the swirling is significant i have a predecessor of the i-vtec, the honda civic 1.5 vtec-e in normal use, at constant speed only half of the inlet valves open while accelerating of at higher revs all valves work the effect is great, a smooth powerful engine (115 hp/ 85 kw) and a very low thirst (more then 17 km/liter) marcel > I know this is silly, but I notice that the Accord EXV6 have the VTEC > and the 4 cyl Accords have the I-VTEC. I ask why this is? Why do you > put a more expensive engine like the I-VTEC in the less expensive 4 > cyl car? Isn't the I-VTEC better? What is the differerence? > > Thank you. the effect of the swirling is significant i have a predecessor of the i-vtec, the honda civic 1.5 vtec-e in normal use, at constant speed only half of the inlet valves open while accelerating of at higher revs all valves work the effect is great, a smooth powerful engine (115 hp/ 85 kw) and a very low thirst (more then 17 km/liter) marcel |
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