fant0m_TL

Guys... I'm trying to explain to my brother the benefit of a VTech engine... any suggestions with this?

He dosent get what all the hype is about...

Also,

I am not familiar with the skyline motor... how does it compare to the TL Vtech?

orgnlprankster7

well first off its vtec no "h" do a search im sure plenty will come up

fant0m_TL

this is true, lol, im an idiot... but there is more of a difference than just an H

orgnlprankster7

In the regular four-stroke automobile engine, the intake and exhaust valves are actuated by lobes on a camshaft. The shape of the lobes determines the timing, lift and duration of each valve. Timing refers to when a valve is opened or closed with respect to the combustion cycle. Lift refers to how much the valve is opened. Duration refers to how long the valve is kept open. Due to the behavior of the gases (air and fuel mixture) before and after combustion, which have physical limitations on their flow, as well as their interaction with the ignition spark, the optimal valve timing, lift and duration settings under low RPM engine operations are very different from those under high RPM. Optimal low RPM valve timing, lift and duration settings would result in insufficient fuel and air at high RPM, thus greatly limiting engine power output. Conversely, optimal high RPM valve timing, lift and duration settings would result in very rough low RPM operation and difficult idling. The ideal engine would have fully variable valve timing, lift and duration, in which the valves would always open at exactly the right point, lift high enough and stay open just the right amount of time for the engine speed in use.

VTEC can be used not only for economy but also for performance.

In practice, a fully variable valve timing engine is difficult to design and implement. Attempts have been made, using solenoids to control valves instead of the typical springs-and-cams setup, however these designs have not made it into production automobiles as they are very complicated and costly.

The opposite approach to variable timing is to produce a camshaft which is better suited to high RPM operation. This approach means that the vehicle will run very poorly at low RPM (where most automobiles spend much of their time) and much better at high RPM. VTEC is the result of an effort to marry high RPM performance with low RPM stability.

Additionally, Japan has a tax on engine displacement, requiring Japanese auto manufacturers to make higher-performing engines with lower displacement. In cars such as the Toyota Supra and Nissan 300ZX, this was accomplished with a turbocharger. In the case of the Mazda RX-7 (turbo) and RX-8, a wankel rotary engine was used. VTEC serves as yet another method to derive very high specific output from lower displacement motors.

from wiki

edit, this may help also
Honda's VTEC system is a simple method of endowing the engine with multiple camshaft profiles optimized for low and high RPM operations. Instead of one cam lobe actuating each valve, there are two - one optimized for low RPM stability & fuel efficiency, with the other designed to maximize high RPM power output. Switching between the two cam lobes is determined by engine oil pressure, engine temperature, vehicle speed, and engine speed. As engine RPM increases, a locking pin is pushed by oil pressure to bind the high RPM cam follower for operation. From this point on, the valve opens and closes according to the high-speed profile, which opens the valve further and for a longer time. The DOHC VTEC system has high and low RPM cam lobe profiles on both the intake and exhaust valve camshafts.

Desert_TL

meowCat

Let's just say..... VTEC means "fast". It'll get you movin.

TLyoung'un

http://videos.streetfire.net/mostdis...52f982ed3a.htm

http://auto.howstuffworks.com/question229.htm

ChucksCL-S

In the video above you'll see the second valve open when the pin slides over, also you can see that the middle cam lobe is higher which pushes the valves down further into the cylinder which lets in more air- fuel mixture.

01tl4tl

Vtec to me means

low speed= 4 cylinder mileage
Fast and hard- drinks gas like a 6 drives like a V8!

Desert_TL

4 cylinder mileage my ass I baby it in the city and barely get 23mpg.

tidus888

i thought VTech only makes cordless phone and similar electronics=)

Black_05_TL_6SP

Wikipedia

Temple of VTEC

Both of these are very useful. They go into great depth. They explain the different types of vtec as well.

01tl4tl

Someone gets 23 in town??!! WoW
These cars suck in town- they like to run!

My OLD (not new cars) 4 cyl worked its self hard on the freeway and got 22 combined
The TL drives with ease and much faster and gets 23 combined
On freeway trips- we are talking high 20s for most members of this board
some even over 30

Desert_TL

No joke. On the way to and from san diego once, I averaged about 90MPH and got 26MPG. Then a second time, I wasn't in as a big a hurry and averaged 75MPH. My MPG went up to 37!!! no joke