I 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

 

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

 

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

 

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.

 

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

 

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

 

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