What is v-tec?

[Yablokov]

ok, so i got a honda civic 1998 EX(chck it out on "what you drive"), and i look uo the VIN# on carfax and it tells me its a 1.6l V-tec.

im like wtf.

it dun say vtec on the engine
so i go and call many shops. lol, but suprizingly none of em know; couse some said it was some said it was bs, ect,ect.

so i go to www.kbb.com, and it also tells me its a vtec. so i goto some top sites for mods, and it talls me its a vtec. im like wtf.

its a SOHC vtec? i dun get it. plz, iv called proffesionals . many of them. and none of em know for sure.

someone please explain to me what a V-tec engine is and what it should do?
and does my lil honda have a v-tec? thank you =D

[graywolf624]

v- tec is hondas version of variable valve timing. Basically the car varies the cam for valve timing based on rpm to allow for better efficiency across the rpm range.

Most companies have their own variation, vtec is just the marketing term.
In general if its a newer non ohv engine it has variable valve timing, though they now have it for ohv as well.

[ZfrkS62]

V-tec is an antiquated form of adjusting the valve timing to lower combustion chamber temps thus lowering the oxides of nitrogen (NOx) emission. A plus side to this is that power band is extended. This is how Honda ditched the power robbing EGR valve which accomplished the same task by recycing a small amount of exhaust gas back into the intake. This lowers the temperature as well, but by placing inert gasses in the cylinder, you reduce the amount of combustible air you can fit in.

Honda did equip thier SOHC engines with the system. If you look on the transmission side of the engine, you will see a little green solenoid. That is the V-tec solenoid. The engine management computer pulses the solenoid and it pressurizes the hydraulic circuit which advances the valve timing on the exhaust valves. I'm not sure if it's done the same on the SOHC as it is on the DOHC though.

So that, in a nutshell, is V-tec :D

[Yablokov]

Some "professianal" told me its the die cast peice that goes from the intake manifold to the cylenders. ccouse he said the DX and LX versions got plastic.

[SilviaEvo]

http://www.leecao.com/honda/vtec/whatsvtec.html
it tells you all about the V-Tec on your specific car. and yes the Civic EX SOHC has V-Tec

[ZfrkS62]

i'm thinking the people you called were all idiots.

Trust me. You got your answers here.

[gigdy]

as far as i know all ex and si versions have vtec.

[ViperASR]

vtec is amazing!

[Yablokov]

ya. ty for all ur help guys. i now know all about vtec ^^

and yes. i did take my car out for a spin after reading about it XD

[PaulGT2164]

your ex has a d16 series vtec motor in it, i cant remember if its a D16y8 or D16Z6
the D16Z6 is most commonly found in the sohc vtec honda del sols and 92-95 civic SI here stateside, after 95 the civic SI had the B16a1 which was the dohc vtec motor

good motors, you can find the one have by looking on your engine block by the timing cover, it will be stamped on a flat spot.

the first car made production wise with vtec was the NSX

there are two kinds of vtec
one for performance and one for economy

[gtx28]

V-tec is an antiquated form of adjusting the valve timing

I respectfully disagree, vtec is an excellent system in theory, and has been successfully executed in application. What other system is as good? All the other systems on the market only affect timing not duration timing and lift.

[frozzu]

BTW It's called vtec not v-tec. There are funny pictures in the web about people calling it v-tec or vtech, v-tech. The same with dohc and doch :)

[graywolf624]

All the other systems on the market only affect timing not duration timing and lift.
At this point that is entirely false.. Almost all systems have those now.. Some of them are even further advanced.. The car I drive comes to mind right off the bat.

Toyotas newest system also has duration, lift, and the newest player variable intake.

Antiquated.. Id say not..
Normal features in most new cars.. yeah.

[ZfrkS62]

what i meant by antiquated was the fact that it was in use for so long before it got updated.

[T-Bird]

VARIABLE VALVE TIMING AND LIFT ELECTRONIC CONTROL (VTEC®)

At low rpm, the VTEC® intake valves follow a set of low-lift, short-duration cam lobes with timing that optimizes the flow of air and fuel into the cylinder. As the engine accelerates, the intake rocker arms transition to actuation by high-lift, long-duration cam lobes designed to optimize high-rpm output. VTEC® delivers substantially more horsepower from 5000 rpm, and provides a considerable torque increase both at low and high engine speeds.

[Mr.Vercetti]

Just a piece of info, the first car manufacturer that introduced variable valve timing was Alfa Romeo in the late '60's... Cause Im sick and tired of hearing that variable valve timing was Honda's inovation...