Honda and Acura Model Specific Forums

CwestGurl · 07-30-2006, 01:19 AM

Wow scary I actually understood what you wrote. I learned something new today.

This ad is not displayed to registered or logged-in members.
Register your free account today and become a member on Honda-Tech!

Miracle · 07-30-2006, 02:22 AM

Quote:

Originally Posted by CwestGurl

Wow scary I actually understood what you wrote. I learned something new today.

See, thats what I am going for right there.

I appreciate that.

Miracle · 08-04-2006, 12:52 PM

Here are a couple videos on the sound of VTEC engagement...

1998 CW ITR:
http://videos.streetfire.net/s...6.htm

N/A LS/VTEC B18:

S2000:
http://videos.streetfire.net/s...8.htm

Modified by .Red.EM2 at 4:45 AM 9/20/2006

iwantspeed · 08-11-2006, 08:33 AM

when i bought my car it had a vtec light installed... i dont know where the wires connect to but it works... most of the time it comes on at around 3300 rpms.

Miracle · 08-13-2006, 04:27 PM

Here are a couple more illustrations of a VTEC valvetrain...

The rocker assembly, the VTEC rocker colored in yellow, and the low RPM rockers in red and blue. Note the locking pin assembly in 2 pieces:

An original Honda illustration, showing how the pin inside the rockers slides over with oil pressure, locking the 3 rockers together...

Metalluthier · 08-14-2006, 03:02 PM

Quote:

Originally Posted by Red_EM2

UPDATED 8-2-06

In a SOHC VTEC motor, the camshaft sits centered in the head, so both of the intake and exhaust valves are engaged on the same camshaft.
There are 3 camshaft lobes on a VTEC camshaft. The three cam lobes in the middle are the intake cam lobes. The two low RPM (the shorter of the 2 profiles) lobes actuate two valve rockers, which in turn pushes the intake valves open.

Actually, the way the spark plug is located on SOHC VTEC engines, it is impossible for VTEC to work for the exhaust valves

DJ AnalogDuck (various artists - mix) - Eastern Duck Heads West (2001) - 05 - Eastern Duck Heads West05.mp3 [192Kbps] (05:54)

Miracle · 08-14-2006, 03:07 PM

I think you misuderstood.

Quote:

Originally Posted by Red_EM2

In a SOHC VTEC motor, the camshaft sits centered in the head, so both of the intake and exhaust valves are engaged on the same camshaft.

I didn't say that VTEC operated both the intake and exhaust valves, but rater that the cam sat centered in the head, and that IT operated both intake and exhaust valves under normal operation.

myst · 08-17-2006, 07:30 AM

wow

Phil McConkey · 09-05-2006, 08:06 AM

The title made me laugh for some reason, lol.

mholt · 09-05-2006, 10:37 AM

Anyone know alot about the K20A3?? I have an 02 Civic SIR, up in Canada, and it seems when it gets a little colder then normal outside the engine makes a high pitched whining noise. Is this normal for these motors? I bought the car when it had 28000 km on it and it started making this weird noise at about 32000 km. I've asked my local dealer what it is and each time they say they will try to figure it out and then they give it back to me telling me that it is because it has a timing chain instead of a belt, and when i ask why it wasnt doing it befor they tell me because it wasnt worked in yet....

Any advice for me anybody? And one more thing. Should there be a kik in the pants when the vtec kiks in?...the car has good power but i can't always feel that extra kik when you hit a certain rpm.

any advice or help is appreciated.

thanks

Curiouz_G · 09-05-2006, 12:28 PM

wrong forum

lorence · 11-01-2006, 01:52 PM

hey im new here and i noticed my v-tec doen't kick in at all when it should because i have an 01 ex. also my car's been laggin meaning running kinda slow. Anyone know wat could be wrong wit it?

Miracle · 11-01-2006, 02:05 PM

Probably needs a decent tune up, and you really will not feel the VTEC in the D17A2 "kick" It is just that harsh of a transition. You will know it, but it won't be like the old B series crossovers.

toyomatt84 · 11-01-2006, 10:15 PM

Quote:

Originally Posted by lorence

hey im new here and i noticed my v-tec doen't kick in at all when it should because i have an 01 ex. also my car's been laggin meaning running kinda slow. Anyone know wat could be wrong wit it?

It does kick in, but it's very difficult to "feel" the changeover. A good test would be to accelerate normally from 1,000 - 2,200 rpm's, then go to Wide Open Throttle through 3,500 rpm's. You'll notice a slight change in pitch, when the rpm's reach about 2,700 (VTEC kick-in point).

Boilermaker1 · 11-02-2006, 06:40 AM

how it works in this piece.... with the real parts
This is an A2 cam

2 outers are the exhaust lobes
there 1 intake lobe and a circular lobe

This is the intake rocker assy

the one on the left has a roller on it and the other one has nothing.
At low RPM, it runs 1 intake valve. At high RPMs, a pin locks the rockers together and both open.

TN90accord · 11-02-2006, 08:18 AM

OK, SO THE D17A2 IS VTEC-E??? On wikipedia it says we have SOHC VTEC, and there was just a thread that brought this up. Everyone in that thread was saying we had SOHC VTEC and not VTEC-E. I think its VTEC-E or else the engagement point wouldn't be so low. Also if these pics are from an A2 this kind of proves its VTEC-E.

toyomatt84 · 11-02-2006, 09:16 AM

None of the K-series engines are VTEC-E. The only engine that's VTEC-E in the 7thgen lineup, is the D17A6 which came with the Civic HX.

Boilermaker1 · 11-02-2006, 09:23 AM

Quote:

Originally Posted by toyomatt84

None of the K-series engines are VTEC-E. The only engine that's VTEC-E in the 7thgen lineup, is the D17A6 which came with the Civic HX.

Depends on how you want to define that. The K20A3 is intake only and operates in a very similar manner. Its got a big lobe and a little lobe on the intake side, when VTEC engages, it puts both valves on the big lift lobe. Thats all it does.... more or less the same thing.

Miracle · 11-02-2006, 09:25 AM

Same principal,different name... VTEC-E as compared to i-VTEC.

toyomatt84 · 11-02-2006, 09:33 AM

Quote:

Originally Posted by Boilermaker1

Depends on how you want to define that. The K20A3 is intake only and operates in a very similar manner. Its got a big lobe and a little lobe on the intake side, when VTEC engages, it puts both valves on the big lift lobe. Thats all it does.... more or less the same thing.

I know that they are almost identical in terms of operation, but if you want to go technical about the definition of the engine types, the D17A6 is the only VTEC-E engine for the 7th gen Civic's.

Miracle · 11-02-2006, 09:35 AM

Quote:

Originally Posted by toyomatt84

I know that they are almost identical in terms of operation, but if you want to go technical about the definition of the engine types, the D17A6 is the only VTEC-E engine for the 7th gen Civic's.

Werd.... You are getting the technical thing down.

Now, if I could only get to YOUR level of knowledge about wheels.

TN90accord · 11-02-2006, 11:22 AM

Wait, so the D17A2 switches between 12 valve and 16 valve operation, but is not VTEC-E? I thought that's what VTEC-E was? I see how the K20A3 motor would be classified as iVTEC, but shouldn't the D17A2 be classified as VTEC-E?

After posting this I re read those post. So the D17A2 has a Low rpm lobe and a high rpm lobe, and when VTEC engages it goes from 12 valve low rpm to 16 valve high rpm? If so I see what you're saying about it not being VTEC-E.

Modified by TN90accord at 2:33 PM 11/2/2006

Miracle · 11-02-2006, 11:27 AM

No, the D17A2 has the traditional VTEC, it just is not the same style, as it only increases duration on the intake valves.

VTEC-E is used only on the D17A6, fouind in the 7th Gen Civic HX.

TN90accord · 11-02-2006, 11:33 AM

Please re read my previous post and tell me if that's correct.

Miracle · 11-02-2006, 11:36 AM

The D17A2 VTEC, is VTEC because it increases the Lift AND duration of the intake valves. A VTEC-E motor only increases the amount of intake valves that operate... Like the K20A3, and the D17A6.

08-04-2006, 12:52 PM	#28
Miracle Member Join Date: Mar 2006 Location: Clarksville, TN Posts: 4,773	Re: (Red_EM2) Here are a couple videos on the sound of VTEC engagement... 1998 CW ITR: http://videos.streetfire.net/s...6.htm N/A LS/VTEC B18: S2000: http://videos.streetfire.net/s...8.htm Modified by .Red.EM2 at 4:45 AM 9/20/2006 __________________ My 'Stang Build v. 2.6H

08-11-2006, 08:33 AM	#29
iwantspeed Junior Member Join Date: Jun 2006 Location: somewhere in WA Posts: 664	Re: (Red_EM2) when i bought my car it had a vtec light installed... i dont know where the wires connect to but it works... most of the time it comes on at around 3300 rpms. __________________ 88 crx hf 1.8l vtec.jdm front. and jdm tail lights.soon to be 500whp full chromolly 10 pc. cage. fresh paint.my shits a go kart SON!. GFI built.

08-13-2006, 04:27 PM	#30
Miracle Member Join Date: Mar 2006 Location: Clarksville, TN Posts: 4,773	Re: (iwantspeed) Here are a couple more illustrations of a VTEC valvetrain... The rocker assembly, the VTEC rocker colored in yellow, and the low RPM rockers in red and blue. Note the locking pin assembly in 2 pieces: An original Honda illustration, showing how the pin inside the rockers slides over with oil pressure, locking the 3 rockers together... __________________ My 'Stang Build v. 2.6H

09-05-2006, 08:06 AM	#34
Phil McConkey B A N N E D Join Date: Aug 2006 Location: The Endzone. Twice. Posts: 66	Re: (myst) The title made me laugh for some reason, lol.

09-05-2006, 10:37 AM	#35
mholt Join Date: Sep 2006 Location: Winnipeg, MB, Canada Posts: 11	i-vtec DOHC k20A3 in an 02 Civic SIR hatch Anyone know alot about the K20A3?? I have an 02 Civic SIR, up in Canada, and it seems when it gets a little colder then normal outside the engine makes a high pitched whining noise. Is this normal for these motors? I bought the car when it had 28000 km on it and it started making this weird noise at about 32000 km. I've asked my local dealer what it is and each time they say they will try to figure it out and then they give it back to me telling me that it is because it has a timing chain instead of a belt, and when i ask why it wasnt doing it befor they tell me because it wasnt worked in yet.... Any advice for me anybody? And one more thing. Should there be a kik in the pants when the vtec kiks in?...the car has good power but i can't always feel that extra kik when you hit a certain rpm. any advice or help is appreciated. thanks __________________ If you dont like imports then that's too bad for you http://images.honda-tech.com/set1/smile/emsmilep.gif

08-17-2006, 07:30 AM	#33
myst Join Date: Sep 2004 Location: hampton, va, usa Posts: 56	wow

11-01-2006, 01:52 PM	#37
lorence Join Date: Nov 2006 Location: seattle, wa, usa Posts: 1	Re: (Curiouz_G) hey im new here and i noticed my v-tec doen't kick in at all when it should because i have an 01 ex. also my car's been laggin meaning running kinda slow. Anyone know wat could be wrong wit it?

11-01-2006, 02:05 PM	#38
Miracle Member Join Date: Mar 2006 Location: Clarksville, TN Posts: 4,773	Re: (lorence) Probably needs a decent tune up, and you really will not feel the VTEC in the D17A2 "kick" It is just that harsh of a transition. You will know it, but it won't be like the old B series crossovers. __________________ My 'Stang Build v. 2.6H

11-02-2006, 06:40 AM	#40
Boilermaker1 Member Join Date: Jun 2003 Location: Washington, DC, USA Posts: 1,748	Re: This, is VTEC explained. (.Red.EM2) how it works in this piece.... with the real parts This is an A2 cam 2 outers are the exhaust lobes there 1 intake lobe and a circular lobe This is the intake rocker assy the one on the left has a roller on it and the other one has nothing. At low RPM, it runs 1 intake valve. At high RPMs, a pin locks the rockers together and both open. __________________ 2002 Civic - POS/Toy 237 HP / 187 TQ @12 PSI 2008 Audi A3 2.0T - Daily Beater

11-02-2006, 08:18 AM	#41
TN90accord Junior Member Join Date: Apr 2006 Location: Pigeon Forge, TN, USA Posts: 168	Re: This, is VTEC explained. (Boilermaker1) OK, SO THE D17A2 IS VTEC-E??? On wikipedia it says we have SOHC VTEC, and there was just a thread that brought this up. Everyone in that thread was saying we had SOHC VTEC and not VTEC-E. I think its VTEC-E or else the engagement point wouldn't be so low. Also if these pics are from an A2 this kind of proves its VTEC-E. __________________ Stephen H22 accord (OFFICIALLY laziest HT member...EVER)* 05 Civic EX SE

11-02-2006, 09:16 AM	#42
toyomatt84 Sanji Join Date: Apr 2005 Location: ALL BLUE Posts: 15,000	None of the K-series engines are VTEC-E. The only engine that's VTEC-E in the 7thgen lineup, is the D17A6 which came with the Civic HX. __________________ *free hugs* IA '09: Midwest Caravan (Click to join us!) ☺☺☺

11-02-2006, 09:25 AM	#44
Miracle Member Join Date: Mar 2006 Location: Clarksville, TN Posts: 4,773	Re: (toyomatt84) Same principal,different name... VTEC-E as compared to i-VTEC. __________________ My 'Stang Build v. 2.6H

11-02-2006, 11:22 AM	#47
TN90accord Junior Member Join Date: Apr 2006 Location: Pigeon Forge, TN, USA Posts: 168	Re: (.Red.EM2) Wait, so the D17A2 switches between 12 valve and 16 valve operation, but is not VTEC-E? I thought that's what VTEC-E was? I see how the K20A3 motor would be classified as iVTEC, but shouldn't the D17A2 be classified as VTEC-E? After posting this I re read those post. So the D17A2 has a Low rpm lobe and a high rpm lobe, and when VTEC engages it goes from 12 valve low rpm to 16 valve high rpm? If so I see what you're saying about it not being VTEC-E. Modified by TN90accord at 2:33 PM 11/2/2006 __________________ Stephen H22 accord (OFFICIALLY laziest HT member...EVER)* 05 Civic EX SE

11-02-2006, 11:27 AM	#48
Miracle Member Join Date: Mar 2006 Location: Clarksville, TN Posts: 4,773	Re: (TN90accord) No, the D17A2 has the traditional VTEC, it just is not the same style, as it only increases duration on the intake valves. VTEC-E is used only on the D17A6, fouind in the 7th Gen Civic HX. __________________ My 'Stang Build v. 2.6H

11-02-2006, 11:33 AM	#49
TN90accord Junior Member Join Date: Apr 2006 Location: Pigeon Forge, TN, USA Posts: 168	Re: (.Red.EM2) Please re read my previous post and tell me if that's correct. __________________ Stephen H22 accord (OFFICIALLY laziest HT member...EVER)* 05 Civic EX SE

11-02-2006, 11:36 AM	#50
Miracle Member Join Date: Mar 2006 Location: Clarksville, TN Posts: 4,773	Re: (TN90accord) The D17A2 VTEC, is VTEC because it increases the Lift AND duration of the intake valves. A VTEC-E motor only increases the amount of intake valves that operate... Like the K20A3, and the D17A6. __________________ My 'Stang Build v. 2.6H

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search