Why Does Audi Use 5 Valves???
08-09-2001, 11:21 PM
#1
Banned
Thread Starter
Why Does Audi Use 5 Valves???
Audi proudly bears the 5V logo on the engine just like how Honda/Acura put the VTEC emblem on and employs it in almost every single one of their cars. What advantadges/disadvantadges are there to 5 valves vs. 4? I heard it gives more torque and a flatter dyno curve (torque wise). If 5 valves is so great then why don't all auto manfactures use it? Any help is appreciated 
08-10-2001, 01:01 AM
#3
Three Wheelin'
Join Date: Jul 2001
Location: Colorado Springs, CO
Age: 43
Posts: 1,535
Likes: 0
Received 0 Likes
on
0 Posts
because..........
It has more power across the board in a wide range. It also revs freely much like our vtechs...... No real advantage, I guess it's vw's way to compete with honda's vtech. Much like toyota's vvt-i and bmw's double vanos.
08-10-2001, 01:05 AM
#4
Retired MOD
Join Date: Mar 2001
Location: Fredericksburg, VA
Age: 46
Posts: 3,995
Likes: 0
Received 1 Like
on
1 Post
Re: because..........
I don't think having one more valve per cylinder has anything to do with valve lift control and timming (vtec,vvt-i, etc)
Originally posted by evolaerok
It has more power across the board in a wide range. It also revs freely much like our vtechs...... No real advantage, I guess it's vw's way to compete with honda's vtech. Much like toyota's vvt-i and bmw's double vanos.
It has more power across the board in a wide range. It also revs freely much like our vtechs...... No real advantage, I guess it's vw's way to compete with honda's vtech. Much like toyota's vvt-i and bmw's double vanos.
08-10-2001, 01:16 AM
#5
Retired MOD
Join Date: Mar 2001
Location: Fredericksburg, VA
Age: 46
Posts: 3,995
Likes: 0
Received 1 Like
on
1 Post
I think I got it. Our four valve system has 2 for intake and 2 for exhaust. 5 valve system has 3 intake valves and 2 exhaust valves.
The Audi five-valve engine owes its effectiveness to the intensive ventilation obtained through five valves per cylinder and the ultra-point fuel injection system's electronic fuel distribution. This new technology, as dependable as it is advanced, guarantees a high level of efficiency, even at low rpm's.
See pic:
The Audi five-valve engine owes its effectiveness to the intensive ventilation obtained through five valves per cylinder and the ultra-point fuel injection system's electronic fuel distribution. This new technology, as dependable as it is advanced, guarantees a high level of efficiency, even at low rpm's.
See pic:
08-10-2001, 01:19 AM
#6
Three Wheelin'
Join Date: Jul 2001
Location: Colorado Springs, CO
Age: 43
Posts: 1,535
Likes: 0
Received 0 Likes
on
0 Posts
kind of.........
Originally posted by Bitium
I think I got it. Our four valve system has 2 for intake and 2 for exhaust. 5 valve system has 3 intake valves and 2 exhaust valves.
The Audi five-valve engine owes its effectiveness to the intensive ventilation obtained through five valves per cylinder and the ultra-point fuel injection system's electronic fuel distribution. This new technology, as dependable as it is advanced, guarantees a high level of efficiency, even at low rpm's.
See pic:
I think I got it. Our four valve system has 2 for intake and 2 for exhaust. 5 valve system has 3 intake valves and 2 exhaust valves.
The Audi five-valve engine owes its effectiveness to the intensive ventilation obtained through five valves per cylinder and the ultra-point fuel injection system's electronic fuel distribution. This new technology, as dependable as it is advanced, guarantees a high level of efficiency, even at low rpm's.
See pic:
08-10-2001, 01:21 AM
#7
Retired MOD
Join Date: Mar 2001
Location: Fredericksburg, VA
Age: 46
Posts: 3,995
Likes: 0
Received 1 Like
on
1 Post
Re: kind of.........
Originally posted by evolaerok
kind of what I said power across the board. I didn't mean to refer the 5v to vtech or anything. It's just audi's way of making efficient hp and torque through there own technology, as honda uses the vtech to do the same.
kind of what I said power across the board. I didn't mean to refer the 5v to vtech or anything. It's just audi's way of making efficient hp and torque through there own technology, as honda uses the vtech to do the same.
k
Trending Topics
08-10-2001, 01:36 AM
#8
Three Wheelin'
Join Date: Jul 2001
Location: Colorado Springs, CO
Age: 43
Posts: 1,535
Likes: 0
Received 0 Likes
on
0 Posts
Ok ok
I'm sorry I don't make sense right now. It's late and I had a loooonnng commute to work, so right now I don't make sense. Whatever the case is, Audi is a horrible car company as far as reliability goes. I've had friends who owned S4's and tt's and they all had some problems with the engine and the whole car itself. *Sigh* I need some Starbucks.................
08-10-2001, 01:44 AM
#9
Retired MOD
Join Date: Mar 2001
Location: Fredericksburg, VA
Age: 46
Posts: 3,995
Likes: 0
Received 1 Like
on
1 Post
Re: Ok ok ok ok
That excuse won't work today with me...hehe.....check this:
http://www.acura-tl.com/forum/showth...threadid=19144
Plus is estern time here in florida
http://www.acura-tl.com/forum/showth...threadid=19144
Plus is estern time here in florida
Originally posted by evolaerok
I'm sorry I don't make sense right now. It's late and I had a loooonnng commute to work, so right now I don't make sense. Whatever the case is, Audi is a horrible car company as far as reliability goes. I've had friends who owned S4's and tt's and they all had some problems with the engine and the whole car itself. *Sigh* I need some Starbucks.................
I'm sorry I don't make sense right now. It's late and I had a loooonnng commute to work, so right now I don't make sense. Whatever the case is, Audi is a horrible car company as far as reliability goes. I've had friends who owned S4's and tt's and they all had some problems with the engine and the whole car itself. *Sigh* I need some Starbucks.................
08-10-2001, 10:31 AM
#10
Advanced
Join Date: Apr 2001
Posts: 61
Likes: 0
Received 0 Likes
on
0 Posts
The reason is...
Three intake valves put a lot of spin on the incoming air, which keeps the flow all nice and laminar while increasing intake speed. This has the bonus of normalizing the distribution of fuel and oxygen. Exhaust is two valves because post-detonation its rather turbulent anyway, and noone cares about how it exits the cylinder.
08-10-2001, 04:43 PM
#12
Acura TL-S
Join Date: Jul 2000
Location: NYC
Posts: 830
Likes: 0
Received 0 Likes
on
0 Posts
Originally posted by jsmith
for v6 with a similar displacement as the 3.2 with their version of vvti and they only get 190 hp. the new version gets 200+ but not even close to 260...
for v6 with a similar displacement as the 3.2 with their version of vvti and they only get 190 hp. the new version gets 200+ but not even close to 260...
08-10-2001, 05:05 PM
#13
Not a Blowhole
There are pros/cons just as in anything else. BTW, Ferrari and others have used 5V heads.
Benefits include high flow, low moving mass, and ability to optimize flow for a given cylinder dimension, piston crown shape, etc.
Disadvatages: more valvetrain capacity, more sensitivity to deposits and heat warpage, likely not as durable.
Honda's SOHC system would be very tricky to implement with 5V, and with the power its gets frok a simple, reliable, and less costly SOHC system, why bothe
Benefits include high flow, low moving mass, and ability to optimize flow for a given cylinder dimension, piston crown shape, etc.
Disadvatages: more valvetrain capacity, more sensitivity to deposits and heat warpage, likely not as durable.
Honda's SOHC system would be very tricky to implement with 5V, and with the power its gets frok a simple, reliable, and less costly SOHC system, why bothe
08-11-2001, 02:41 AM
#14
Three Wheelin'
Join Date: Jul 2001
Location: Colorado Springs, CO
Age: 43
Posts: 1,535
Likes: 0
Received 0 Likes
on
0 Posts
I just.........
Originally posted by ZodiakTL
and the nsx uses the same 3.2l volume to obtain 290hp. can't wait to see what they can optimize the 3.5l to do!
and the nsx uses the same 3.2l volume to obtain 290hp. can't wait to see what they can optimize the 3.5l to do!
V6, can you just imagine?!?!? In a few years that may be my new car.....
08-11-2001, 11:07 PM
#16
Senior Moderator
Originally posted by unx979
i would just like to point out that the first gen 2.5TL's are also inline 5's aren't we so special? hehe
i would just like to point out that the first gen 2.5TL's are also inline 5's
aren't we so special? hehe
08-12-2001, 07:30 PM
#18
Pro
Join Date: Sep 2000
Posts: 552
Likes: 0
Received 0 Likes
on
0 Posts
I read a while back that the next generation NSX and the RL (Legend) would be having a 5Valve per cylinder DOHC engine design.... but contradicting rumors later on, did not seem to indicate so..
Thread
Thread Starter
Forum
Replies
Last Post
