does vtec not kick in when engine is not warmed up yet? plus whats the difference between regular vtec and the ivtec? is it just more fuel friendly? thanx guys

 

Umm it should kick in whens it's cold but i wouldn't really know cause it's not good to rev it up that high when it's cold. Just don't touch vtec till the car is at operating temp.

And regular VTEC is just the variable lift where the intake valve rockers switch to a larger lobe. On I-VTEC it still does that but in addition it can retard and advance the intake cam on the fly which further increases torque.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SteaveO2 &raquo;</TD></TR><TR><TD CLASS="quote">Umm it should kick in whens it's cold but i wouldn't really know cause it's not good to rev it up that high when it's cold. Just don't touch vtec till the car is at operating temp.

And regular VTEC is just the variable lift where the intake valve rockers switch to a larger lobe. On I-VTEC it still does that but in addition it can retard and advance the intake cam on the fly which further increases torque.</TD></TR></TABLE>

Correct. Also, VTEC will not kick in if the engine is cold, car is parked or low on oil

 

the only difference between vtec and ivtec is that ivtec prevents you from hitting vtec when the engine is cold thats it

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 06civicsareus &raquo;</TD></TR><TR><TD CLASS="quote">the only difference between vtec and ivtec is that ivtec prevents you from hitting vtec when the engine is cold thats it</TD></TR></TABLE>

I hate to be the one to break the news but you are WAY off.

VTEC from say a B Series engine will not engage [or hit as the ricers say] when the engine is cold just as IVTEC engines won't do it when the engine is cold.

 

so both dont "engage" (im no ricer, bad choice of vocabulary) when the engine is cold?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 06civicsareus &raquo;</TD></TR><TR><TD CLASS="quote">so both dont "engage" (im no ricer, bad choice of vocabulary) when the engine is cold?</TD></TR></TABLE>

Correct.

 

alright, thanks for clearing that up about the temperature issue, here is a link that will clear up the original poster's issues:
http://asia.vtec.net/article/k20a/index.html

 

here is the best way to understand vtec https://honda-tech.com/zerothread?id=1689966

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 06blaksi &raquo;</TD></TR><TR><TD CLASS="quote">

Correct. Also, VTEC will not kick in if the engine is cold, car is parked or low on oil</TD></TR></TABLE>

Aight, i wasn't sure on that one. Never tried it, it's not hard to wait like 5 mins for the thing to warm up before u hit vtec. I usually don't go over like 4 grand when it's cold.

 

What seperates hondas VTEC from all the other auto makers 'vtec' like processes? Only thing I notice, is when vtec kicks in, its a lot more of a 'kick' than other makes.

 

wow this is a total hack of a thread..

Vtec is on the intake and exhaust cam on B and Ks..

Vtec is when the cam has 2 lobe profiles.
on a B series Vtec needs
oil pressure(not on JDM motors)
coolant temp(not on hondata from what i hear)
speed sensor

on a K i have NO IDEA
but i would expect speed and oil pressure

now the I has to do with the variable intake cam where it will advance and retard. kinda like the AVCS found on a subaru sti