V tec vs I Vtec

[TeamFL1]

whats the difference between these two? are they the same?

[RSX-S777]

No, they are not quite the same. 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.

Also, 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. 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.

[TeamFL1]

SO why the 05 RL is VTEC n makeing 300hp...dunt slap me if this is a dumb question....

[RSX-S777]

I don't know exactly why they chose VTEC over i-VTEC for the new RL. It might have been a choice based on the fact that the RL was initially supposed to be a hybrid or incorporate a new cylinder deactivation system (which will be on the new Accord). The CDS supposedly creates better fuel economy with no performance sacrifice. Then again i-VTEC may just be more practical for the smaller RSX 4 cylinder engine as opposed to the powerful 6 in the RL.

[whitGSR07]

NSX and TL also have regular VTEC...interesting...

[wongb18c]

............

[RSX-S777]

^This is wong mulling it over, apparently...

[crazy_canuck]

Or maybe he's having a period and decided to tell us about it?