when did honda first begin to implement vtec on their production cars? i ask because my friend claims the reason his prelude doesnt have vtec is because honda didnt start using it until 1993.(?) any one have input? i dont want to get into a debate without this knowledge. thanks

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by WangChung &raquo;</TD></TR><TR><TD CLASS="quote">friend claims the reason his prelude doesnt have vtec is because honda didnt start using it until 1993.(?) any one have input? thanks</TD></TR></TABLE>

Your friend is wrong. Think about the crx SiR's with the 1st gen b16, that was late 80', early 90's. Im sure someone could chime in with other vehicles/makes/exact years.

 

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

Your friend is wrong. Think about the crx SiR's with the 1st gen b16, that was late 80', early 90's. Im sure someone could chime in with other vehicles/makes/exact years.</TD></TR></TABLE>

but that was in JAPAN. sorry i didnt make it clear, but im talkin about in the US.

 

vtec hit in the us with the 92 integra gs-r. as far as the doch motors went!
It also encluded the d16z6 sohc vtec motor appearance as well!

 

I *THINK* the NSX had it first. Not sure though. I vaguely (sp?) remember a topic on this before but I wouldn't search VTEC unless you have a couple days to go through the threads.

 

Also the VX/EX and Si. But 89 models were the first to use it.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SolObsession &raquo;</TD></TR><TR><TD CLASS="quote">I *THINK* the NSX had it first. Not sure though. I vaguely (sp?) remember a topic on this before but I wouldn't search VTEC unless you have a couple days to go through the threads.</TD></TR></TABLE>

haha! i tried but i was like fuggit. so, ur sayin the DA teggy's and civic si/ex's had vtec in 1992? cool.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 92b16vx &raquo;</TD></TR><TR><TD CLASS="quote">Also the VX/EX and Si. But 89 models were the first to use it.</TD></TR></TABLE>
What the heck is this? What us 89 model had vtec? the vx...right?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mattssi &raquo;</TD></TR><TR><TD CLASS="quote">
What the heck is this? What us 89 model had vtec? the vx...right? </TD></TR></TABLE>

i dont think theres such a thing.

 

Oh my so much crap thrown around.

First car in Japan - Integra XSi

First car in US - 91 NSX

 

thanks man!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Mr Milano &raquo;</TD></TR><TR><TD CLASS="quote">Oh my so much crap thrown around.

First car in Japan - Integra XSi

First car in US - 91 NSX</TD></TR></TABLE>

100% correct. I have worked for Honda for two plus years and the NSX is KNOWN as the mother of VTEC. Here is another random question about VTEC for ya. What does it stand for. Try that one on for size kiddies! Happy Tuning!!!

 

variable valve timing electronic control?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Turbo E 604 &raquo;</TD></TR><TR><TD CLASS="quote">variable valve timing electronic control?</TD></TR></TABLE>

close, but you forgot an "and" and a "lift"

 

Sorry, I meant the first years to use vtec were 89, not nescessarily in the US, and the VX, Si/EX was directed to the first in the US being the 92 GSR, since those also had vtec and came out in 92

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Mr Milano &raquo;</TD></TR><TR><TD CLASS="quote">Oh my so much crap thrown around.

First car in Japan - Integra XSi

First car in US - 91 NSX</TD></TR></TABLE>
Correct.

The first cars to use the Honda VTEC system (not the first car with variable valve timing though) were the Integra XSi and RSi, introduced in Japan in 1989. They were powered by the B16A, making the B16A the first production VTEC engine.

The first car to use VTEC in the United States was the NSX, introduced in 1991.

 

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

close, but you forgot an "and" and a "lift" </TD></TR></TABLE>
Very true, VTEC = Variable Valve Timing and Lift Electronic Control...

Wow I thought I would see answers like... Well I'm not sure, but I didn't expect the first fearless soul to be so close, good job man. Now chew on this one...

How does i-VTEC differ from VTEC? I am looking for the added component and its purpose... Happy Tuning and now all the little kiddies can go home and tell their mother they actually learned something today, LOL!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by HondaFanatic708 &raquo;</TD></TR><TR><TD CLASS="quote">
Very true, VTEC = Variable Valve Timing and Lift Electronic Control...

Wow I thought I would see answers like... Well I'm not sure, but I didn't expect the first fearless soul to be so close, good job man. Now chew on this one...

How does i-VTEC differ from VTEC? I am looking for the added component and its purpose... Happy Tuning and now all the little kiddies can go home and tell their mother they actually learned something today, LOL!</TD></TR></TABLE>
That would be Variable Timing Control which is on the intake camshaft and allows the valve opening overlap between the intake and exhaust valves to be continously varied during engine operation.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by HondaFanatic708 &raquo;</TD></TR><TR><TD CLASS="quote">
How does i-VTEC differ from VTEC? I am looking for the added component and its purpose... </TD></TR></TABLE>
You are in luck because I just happen to have a huge write-up with pics that I wrote about i-VTEC engines.

http://www.superhonda.com/foru...05867

If you have any more questions about i-VTEC, just ask.

 

About the VTC mechinism, how does that work?? and is it applicable for say a h22a?? it doesnt look electronically controlled.
btw great right up. So there isnt a vtec at all on the k20a3. i was under the assumtion that "vtec" only engaged on the intake cam on the a3. My friend has a new SI and it seems to at least get louder at higher rpms. must by my imagination?

 

thanks for the info targa.

 

You just made things way more confusing for yourself. The K20a3 has i-Vtec, which performs the same functions as basic VTEC, plus the added VTC like stated above. someone correct me if im wrong, but VTEC engages on both the intake and exhaust valves on the i-Vtec motors. The H22a never came with i-Vtec, therefore the VTC doesn't apply to it.

 

so your saying that targa is wrong?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by LudeHatchH22a &raquo;</TD></TR><TR><TD CLASS="quote">About the VTC mechinism, how does that work??</TD></TR></TABLE>
It uses oil pressure to adjust the camshaft timing, by forcing oil into the mechanism you see in the picture to rotate the camshaft relative to the cam sprocket.



<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote &raquo;</TD></TR><TR><TD CLASS="quote">and is it applicable for say a h22a??</TD></TR></TABLE>
No, because the H22A does not have i-VTEC.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote &raquo;</TD></TR><TR><TD CLASS="quote">it doesnt look electronically controlled.</TD></TR></TABLE>
It is. There has to be some kind of electronics behind the system to tell it what to do.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote &raquo;</TD></TR><TR><TD CLASS="quote">So there isnt a vtec at all on the k20a3. i was under the assumtion that "vtec" only engaged on the intake cam on the a3.</TD></TR></TABLE>
The K20A3 has VTEC-E, which means it has two (2) cam lobes on the intake side only. Regular DOHC VTEC would have three (3) cam lobes on both the intake and exhaust sides.

K20A3 VTEC-E intake camshaft:



K20A2 DOHC VTEC intake camshaft:



<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote &raquo;</TD></TR><TR><TD CLASS="quote">My friend has a new SI and it seems to at least get louder at higher rpms. must by my imagination?</TD></TR></TABLE>
It does get louder - because it is revving higher.

Around 5000 RPM or so, there is said to be some sort of harmonic effect in the K20A3 that causes a change in engine noise. This is not related to VTEC. It's kind of like how the DOHC ZC engine will change tone at high RPM, even though it does not have VTEC.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by sector9guy &raquo;</TD></TR><TR><TD CLASS="quote">You just made things way more confusing for yourself. The K20a3 has i-Vtec, which performs the same functions as basic VTEC, plus the added VTC like stated above. someone correct me if im wrong, but VTEC engages on both the intake and exhaust valves on the i-Vtec motors. The H22a never came with i-Vtec, therefore the VTC doesn't apply to it. </TD></TR></TABLE>

No he didn't. You're the one trying to confuse the **** outta everybody. Wise men speak because they have something to say...fools because they have to say something . Nice info Targa. I appreciate the time and the effort you put into that write-up.