What is i-VTEC?
Thread Starter
Joined: Feb 2003
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From: Chicag, Illinois, U.S.
What is i-VTEC?
Can anyone thoroughly explain i-vtec for me? Advantages disadvantages?
Also, does it compare to older regular VTEC model engines? I understand that the regular model works with an extra rocker arm that activates at certain RPM to allow more air during the intake stroke. I also know the "i" stands for intelligence
. Other than that, I'm clueless. Thanks
Also, does it compare to older regular VTEC model engines? I understand that the regular model works with an extra rocker arm that activates at certain RPM to allow more air during the intake stroke. I also know the "i" stands for intelligence
. Other than that, I'm clueless. Thanks
Honda-Tech Member
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From: 805, socal, USA
Re: What is i-VTEC? (gYrOs EX sToCk)
http://www.howstuffworks.com ?
i-vtec stands for intelligent variable valve timing and lift electronic control
i-vtec stands for intelligent variable valve timing and lift electronic control
Member
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From: CHEESE BALL, USA
Re: What is i-VTEC? (gYrOs EX sToCk)
I think that the I-VTEC changes timing on the intake cam depending on the RPM's and what not....
i guess its like an automatic adjustable cam sprocket....
thats how i understood it....
i guess its like an automatic adjustable cam sprocket....
thats how i understood it....
Thread Starter
Joined: Feb 2003
Posts: 2
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From: Chicag, Illinois, U.S.
Re: What is i-VTEC?
aite...thanks you 2, but i asked more than one question. Anyone else wanna give it a shot? I've been lookin online the whole day but no luck findin info, so i'm still depedin on y'all. Thanks.
Honda-Tech Member
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From: twin cities, Mn, usa
Re: What is i-VTEC? (gYrOs EX sToCk)
I vtec slowly inguages as apposed to Vtec witch is on or off i'm guessing the only difference i can really think of would be that I Vtec would have a smoother power ban. anyone want to conferm this? i'm not 100% posative
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From: PA
Re: What is i-VTEC? (degooser)
I think that the I-VTEC changes timing on the intake cam depending on the RPM's and what not....
i guess its like an automatic adjustable cam sprocket....
thats how i understood it....
i guess its like an automatic adjustable cam sprocket....
thats how i understood it....
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Senior Member
Joined: May 2001
Posts: 10,753
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From: Where snow is, I am.
Re: What is i-VTEC? (Yuber)
i-vtec is the same theory as the regular vtec.
the only difference, is that it basically retards/advances the intake & exhaust cam depending on engine load (temp of air, octane of fuel, etc.).
i-vtec engages like regular vtec at about 2500 rpm's, I believe. Lower than 2500 RPM's, has the idle cam timing so that it may have the smoothest operating idle possible.
just a few K series heads up:
for Civic Si and RSX Base Model -- It's on the intake cam only
for RSX Type S, JDM ITR and CTR is both on intake and exhaust cams.
HTH.
[edit]
PS -> they also turned around the motor (spinning in the opposite direction), which produces more power due to the intake being in front and exhaust going straight out, and they ALSO switched to timing chains instead of belts this time (this I am pretty sure of) -- which is better as well.
[/edit]
[Modified by poison, 10:58 PM 2/5/2003]
the only difference, is that it basically retards/advances the intake & exhaust cam depending on engine load (temp of air, octane of fuel, etc.).
i-vtec engages like regular vtec at about 2500 rpm's, I believe. Lower than 2500 RPM's, has the idle cam timing so that it may have the smoothest operating idle possible.
just a few K series heads up:
for Civic Si and RSX Base Model -- It's on the intake cam only
for RSX Type S, JDM ITR and CTR is both on intake and exhaust cams.
HTH.
[edit]
PS -> they also turned around the motor (spinning in the opposite direction), which produces more power due to the intake being in front and exhaust going straight out, and they ALSO switched to timing chains instead of belts this time (this I am pretty sure of) -- which is better as well.
[/edit]
[Modified by poison, 10:58 PM 2/5/2003]
Joined: Nov 2002
Posts: 509
Likes: 3
From: walnut, ca, usa
Re: What is i-VTEC? (poison)
vtec only opens up valves longer or high or both, but ivtec is a variable cam gear that change phases. like a "variable cam gear" i think this technology is relatively old and is similar to BMW's vanos. toyotas have it too.
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Joined: Jan 2002
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From: PA
Re: What is i-VTEC? (poison)
i-vtec engages like regular vtec at about 2500 rpm's, I believe. Lower than 2500 RPM's, has the idle cam timing so that it may have the smoothest operating idle possible.
just a few K series heads up:
for Civic Si and RSX Base Model -- It's on the intake cam only
for RSX Type S, JDM ITR and CTR is both on intake and exhaust cams.
HTH.
[edit]
PS -> they also turned around the motor (spinning in the opposite direction), which produces more power due to the intake being in front and exhaust going straight out, and they ALSO switched to timing chains instead of belts this time (this I am pretty sure of) -- which is better as well.
[/edit]
[Modified by poison, 10:58 PM 2/5/2003]
just a few K series heads up:
for Civic Si and RSX Base Model -- It's on the intake cam only
for RSX Type S, JDM ITR and CTR is both on intake and exhaust cams.
HTH.
[edit]
PS -> they also turned around the motor (spinning in the opposite direction), which produces more power due to the intake being in front and exhaust going straight out, and they ALSO switched to timing chains instead of belts this time (this I am pretty sure of) -- which is better as well.
[/edit]
[Modified by poison, 10:58 PM 2/5/2003]
be professional
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Posts: 14,842
Likes: 13
From: Pittsburgh, PA
Re: What is i-VTEC? (gYrOs EX sToCk)
From what I gather, the K20A3 actually has a form of VTEC-E rather than standard VTEC. Read about it here.
I think the K20A3 would be more accurately called an "i-VTEC-E" engine.
I think the K20A3 would be more accurately called an "i-VTEC-E" engine.
Senior Member
Joined: May 2001
Posts: 10,753
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From: Where snow is, I am.
Re: What is i-VTEC? (Yuber)
2200rpm is when it engages, on the K20A3. K20A2 (Type S motor) has the same VTEC crossover (5800) as older VTEC engines. They do use timing chains as well.
Joined: Sep 2002
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Re: What is i-VTEC? (poison)
yeah I agree, VTEC is like an on/off switch from commuter motor, to crack-head race motor. I-VTEC is like boozing in between, it's more gradual and produces a bit more torque but at the sacrifice of of that great sound and a lower redline 
Member
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From: Somewhere in Virginia, USA
Re: What is i-VTEC? (poison)
and they ALSO switched to timing chains instead of belts this time (this I am pretty sure of) -- which is better as well.
Shawn
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Joined: Aug 2002
Posts: 601
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From: Harris County, South East Texas
Re: What is i-VTEC? (poison)
for Civic Si and RSX Base Model -- It's on the intake cam only
for RSX Type S, JDM ITR and CTR is both on intake and exhaust cams.
i was just starting to kinda like them....
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From: Escapading on my Zepplin, CA
Re: What is i-VTEC? (import_racer_7)
ok....the I-vtec is like VTEC. except it has VTC. basically....VTEC+VTC= i VTEC. catch me? if i can...ill find a website that will explain it better...all i can tell you is...the K20 engine has 4 different stages....economy...low end torque....full power...and 1 other...i cant remember...but in the first 3 stages...for each cylinder only 1 valve fully opens...while the other opens only slightly...to create a swirl effect....i can look for the website...but i dont wanna...PM me if u wanna see it
EDIT: and i think vtec engages highly on throttle response...because both intake valves wont open all the way until you press on full throttle...or get to those higher rpms...
and i think some of you are WRONG by saying VTEC engages at 2200 rpm or 2500 rpm or whatever...vtec is variable valve timing and lift electronic control...
the actual vtec lobes wont engage until its in the 4th mode "high power" mode or something like that...you get the idea...the actual VTC will do those other 3 stages. i THINK.
and some of the tech behind the intake manifold is a dual runner intake...like on the b18c and b18c1....except they made it better...so...thats how they get some of that fuel economy down...
[Modified by JUN EK9, 11:42 PM 2/6/2003]
[Modified by JUN EK9, 11:47 PM 2/6/2003]
EDIT: and i think vtec engages highly on throttle response...because both intake valves wont open all the way until you press on full throttle...or get to those higher rpms...
and i think some of you are WRONG by saying VTEC engages at 2200 rpm or 2500 rpm or whatever...vtec is variable valve timing and lift electronic control...
the actual vtec lobes wont engage until its in the 4th mode "high power" mode or something like that...you get the idea...the actual VTC will do those other 3 stages. i THINK.
and some of the tech behind the intake manifold is a dual runner intake...like on the b18c and b18c1....except they made it better...so...thats how they get some of that fuel economy down...
[Modified by JUN EK9, 11:42 PM 2/6/2003]
[Modified by JUN EK9, 11:47 PM 2/6/2003]
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Joined: Jan 2002
Posts: 3,712
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From: PA
Re: What is i-VTEC? (JUN EK9)
ok....the I-vtec is like VTEC. except it has VTC. basically....VTEC+VTC= i VTEC. catch me? if i can...ill find a website that will explain it better...all i can tell you is...the K20 engine has 4 different stages....economy...low end torque....full power...and 1 other...i cant remember...but in the first 3 stages...for each cylinder only 1 valve fully opens...while the other opens only slightly...to create a swirl effect....i can look for the website...but i dont wanna...PM me if u wanna see it
EDIT: and i think vtec engages highly on throttle response...because both intake valves wont open all the way until you press on full throttle...or get to those higher rpms...
and i think some of you are WRONG by saying VTEC engages at 2200 rpm or 2500 rpm or whatever...vtec is variable valve timing and lift electronic control...
the actual vtec lobes wont engage until its in the 4th mode "high power" mode or something like that...you get the idea...the actual VTC will do those other 3 stages. i THINK.
and some of the tech behind the intake manifold is a dual runner intake...like on the b18c and b18c1....except they made it better...so...thats how they get some of that fuel economy down...
[Modified by JUN EK9, 11:42 PM 2/6/2003]
[Modified by JUN EK9, 11:47 PM 2/6/2003]
EDIT: and i think vtec engages highly on throttle response...because both intake valves wont open all the way until you press on full throttle...or get to those higher rpms...
and i think some of you are WRONG by saying VTEC engages at 2200 rpm or 2500 rpm or whatever...vtec is variable valve timing and lift electronic control...
the actual vtec lobes wont engage until its in the 4th mode "high power" mode or something like that...you get the idea...the actual VTC will do those other 3 stages. i THINK.
and some of the tech behind the intake manifold is a dual runner intake...like on the b18c and b18c1....except they made it better...so...thats how they get some of that fuel economy down...
[Modified by JUN EK9, 11:42 PM 2/6/2003]
[Modified by JUN EK9, 11:47 PM 2/6/2003]
Senior Member
Joined: May 2001
Posts: 10,753
Likes: 1
From: Where snow is, I am.
Re: What is i-VTEC? (JUN EK9)
ok....the I-vtec is like VTEC. except it has VTC. basically....VTEC+VTC= i VTEC. catch me? if i can...ill find a website that will explain it better...all i can tell you is...the K20 engine has 4 different stages....economy...low end torque....full power...and 1 other...i cant remember...but in the first 3 stages...for each cylinder only 1 valve fully opens...while the other opens only slightly...to create a swirl effect....i can look for the website...but i dont wanna...PM me if u wanna see it
EDIT: and i think vtec engages highly on throttle response...because both intake valves wont open all the way until you press on full throttle...or get to those higher rpms...
and i think some of you are WRONG by saying VTEC engages at 2200 rpm or 2500 rpm or whatever...vtec is variable valve timing and lift electronic control...
the actual vtec lobes wont engage until its in the 4th mode "high power" mode or something like that...you get the idea...the actual VTC will do those other 3 stages. i THINK.
and some of the tech behind the intake manifold is a dual runner intake...like on the b18c and b18c1....except they made it better...so...thats how they get some of that fuel economy down...
EDIT: and i think vtec engages highly on throttle response...because both intake valves wont open all the way until you press on full throttle...or get to those higher rpms...
and i think some of you are WRONG by saying VTEC engages at 2200 rpm or 2500 rpm or whatever...vtec is variable valve timing and lift electronic control...
the actual vtec lobes wont engage until its in the 4th mode "high power" mode or something like that...you get the idea...the actual VTC will do those other 3 stages. i THINK.
and some of the tech behind the intake manifold is a dual runner intake...like on the b18c and b18c1....except they made it better...so...thats how they get some of that fuel economy down...
No one ever said VTEC engages at 2300 or 2500 RPM. VTC engages at that RPM.
For VTEC, it's always engaged at way later RPM like regular VTEC engines, where the HELL did you get all that information from?
I think you should further research on i-VTEC bro.
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From: WNC
Re: What is i-VTEC? (poison)
Ok here we go...I am sorry for any spelling problems. I have a broke finger.
On the new Si and the base RSX the intake cam we all know runs 8-valves.
and the exhaust runs 8-valves...the exhaust cam is set and does not change a
thing. However on the intake cam is where the majic dies I.M.O.
This sort of disapoints me...the intake cam has a primary intake valve and a
secondary intake valve. under @2300-2500 rpms the seconday intake valve opens
up to something like 13 or so mm. am not sure. I am not at work or i would have
the exacts for you. Above 2300 rpms the secondary intake valve opens up the same distance as the primary. witch i think is about 23 or so mm.
I think it is pretty lame but it does have 2.0 liters.
B.T.W. the switchover in a rsx-s sounds like a type-r. Modified of course.
tyr and hear the switchover in the si or base rsx engine.
Sorry for the length.
On the new Si and the base RSX the intake cam we all know runs 8-valves.
and the exhaust runs 8-valves...the exhaust cam is set and does not change a
thing. However on the intake cam is where the majic dies I.M.O.
This sort of disapoints me...the intake cam has a primary intake valve and a
secondary intake valve. under @2300-2500 rpms the seconday intake valve opens
up to something like 13 or so mm. am not sure. I am not at work or i would have
the exacts for you. Above 2300 rpms the secondary intake valve opens up the same distance as the primary. witch i think is about 23 or so mm.
I think it is pretty lame but it does have 2.0 liters.
B.T.W. the switchover in a rsx-s sounds like a type-r. Modified of course.
tyr and hear the switchover in the si or base rsx engine.
Sorry for the length.
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Joined: Jun 2002
Posts: 282
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From: Palm Coast, FL, USA
Re: What is i-VTEC? (mist Si)
I vtec slowly inguages as apposed to Vtec witch is on or off i'm guessing the only difference i can really think of would be that I Vtec would have a smoother power ban. anyone want to conferm this? i'm not 100% posative
[Modified by vtechatch, 2:43 AM 2/7/2003]
H-T Poker champion
Joined: Apr 2002
Posts: 5,921
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From: Columbus Ohio
Re: What is i-VTEC? (vtechatch)
Damn,This guy is the absolute worst speller there ever was.You better "inguage" in some reading.Lol
A lot of conflicting ideas on I-VTEC so far.. I'm so confused now i'm not sure what i believe compared to what i thought i believed.. lol!
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Joined: Mar 2002
Posts: 551
Likes: 1
Re: What is i-VTEC? (Hatchy-Ownzjo0)
To clarify, the RSX-S features the only K-series motor mentioned that has VTEC on both the intake and exhaust cams. The i component of i-VTEC (VTC) is featured only on the intake cam, regardless of the motor. Honda simply doesn't [yet] make a motor with VTC on both cams.
Accord (4-cyl), CR-V, Si, RSX (base): DOHC i-VTEC.. VTEC only on intake cam, VTC only on intake cam.
RSX-S: DOHC i-VTEC.. VTEC on both cams, VTC only on intake cam.
Accord (4-cyl), CR-V, Si, RSX (base): DOHC i-VTEC.. VTEC only on intake cam, VTC only on intake cam.
RSX-S: DOHC i-VTEC.. VTEC on both cams, VTC only on intake cam.
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From: Escapading on my Zepplin, CA
Re: What is i-VTEC? (Yuber)
ok....the I-vtec is like VTEC. except it has VTC. basically....VTEC+VTC= i VTEC. catch me? if i can...ill find a website that will explain it better...all i can tell you is...the K20 engine has 4 different stages....economy...low end torque....full power...and 1 other...i cant remember...but in the first 3 stages...for each cylinder only 1 valve fully opens...while the other opens only slightly...to create a swirl effect....i can look for the website...but i dont wanna...PM me if u wanna see it
EDIT: and i think vtec engages highly on throttle response...because both intake valves wont open all the way until you press on full throttle...or get to those higher rpms...
and i think some of you are WRONG by saying VTEC engages at 2200 rpm or 2500 rpm or whatever...vtec is variable valve timing and lift electronic control...
the actual vtec lobes wont engage until its in the 4th mode "high power" mode or something like that...you get the idea...the actual VTC will do those other 3 stages. i THINK.
and some of the tech behind the intake manifold is a dual runner intake...like on the b18c and b18c1....except they made it better...so...thats how they get some of that fuel economy down...
[Modified by JUN EK9, 11:42 PM 2/6/2003]
[Modified by JUN EK9, 11:47 PM 2/6/2003]
Click the link in Targa's post and do some reading. Its you thats wrong, bud.
EDIT: and i think vtec engages highly on throttle response...because both intake valves wont open all the way until you press on full throttle...or get to those higher rpms...
and i think some of you are WRONG by saying VTEC engages at 2200 rpm or 2500 rpm or whatever...vtec is variable valve timing and lift electronic control...
the actual vtec lobes wont engage until its in the 4th mode "high power" mode or something like that...you get the idea...the actual VTC will do those other 3 stages. i THINK.
and some of the tech behind the intake manifold is a dual runner intake...like on the b18c and b18c1....except they made it better...so...thats how they get some of that fuel economy down...
[Modified by JUN EK9, 11:42 PM 2/6/2003]
[Modified by JUN EK9, 11:47 PM 2/6/2003]
Click the link in Targa's post and do some reading. Its you thats wrong, bud.
which part is wrong ?
[Modified by JUN EK9, 3:45 AM 2/7/2003]
Joined: Feb 2003
Posts: 306
Likes: 0
Re: What is i-VTEC? (DaiJekBok)
Well, the K20A2 produces 200 HP and gets 20 more with an CAI. 20 HP... Also, Jackson Racing says that with its supercharger, intake, and some help from our pals at Hondata it'll be making about 270 HP.
<A HREF="http://forums.clubrsx.com/showthread.php?s=&threadid=62973
" TARGET="_blank">http://forums.clubrsx.com/showthread...threadid=62973
</a>
Well, technically, I guess that's Hondata saying that, but whatever. Dart needs to get on their game and make some blocks for this kinda madness. I think those kind folks over at Toda have already made the appropriate valve springs and rods and pistons and such.
<A HREF="http://forums.clubrsx.com/showthread.php?s=&threadid=62973
" TARGET="_blank">http://forums.clubrsx.com/showthread...threadid=62973
</a>
Well, technically, I guess that's Hondata saying that, but whatever. Dart needs to get on their game and make some blocks for this kinda madness. I think those kind folks over at Toda have already made the appropriate valve springs and rods and pistons and such.
Senior Member
Joined: May 2001
Posts: 10,753
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From: Where snow is, I am.
Re: What is i-VTEC? (JUN EK9)
hmmmm. well...
vtec engages high on throttle response? to some effect yes. the vtc in i-vtec is regulated by hydraulic pressure to advance or retard the intake cam in i-vtec motors -- just like BMW's and Toyota's variable timing. The cam lobe switching is off of oil pressure, coolant temperature and making sure there is no codes to jeopardize the operation of the motor before the bigger lobe crossover.
4th mode "high power"? ::whoosh 2 feet above my head::
no one ever said vtec engages at 2200 rpm or 2500 rpm. VTC does. the switching of the cam lobes is as normal.
the vtc and vtec combination provides more power at less fuel consumption and less emissions.
where did this come about? no one said anything about dual runners.
just pretty much your whole theory of your post was not answering the question and didn't have anything to do with what the question of the thread was.
just another piece of advise man. I would avoid "thingie" and "rpm or whatever" and such -- when someone is trying to read what you say and learn from it, things like that will just throw it off.
EDIT: and i think vtec engages highly on throttle response...because both intake valves wont open all the way until you press on full throttle...or get to those higher rpms...
and i think some of you are WRONG by saying VTEC engages at 2200 rpm or 2500 rpm or whatever...vtec is variable valve timing and lift electronic control...
the actual vtec lobes wont engage until its in the 4th mode "high power" mode or something like that...you get the idea...the actual VTC will do those other 3 stages.
the actual vtec lobes wont engage until its in the 4th mode "high power" mode or something like that...you get the idea...the actual VTC will do those other 3 stages.
no one ever said vtec engages at 2200 rpm or 2500 rpm. VTC does. the switching of the cam lobes is as normal.
the vtc and vtec combination provides more power at less fuel consumption and less emissions.
and some of the tech behind the intake manifold is a dual runner intake...like on the b18c and b18c1....except they made it better...so...thats how they get some of that fuel economy down...
just pretty much your whole theory of your post was not answering the question and didn't have anything to do with what the question of the thread was.
just another piece of advise man. I would avoid "thingie" and "rpm or whatever" and such -- when someone is trying to read what you say and learn from it, things like that will just throw it off.