What is VTEC and how does it work?

[Mr Aryan]

Most of you hear VTEC, VTEC and VTEC, and hear about honda engines screaming after 5000rpm, 5400rpm or maybe 6000rpm (my type R) :naughty: ... but don't know what does it stands for? or how does it work?!?! :confused:
well, here you go.... :bigok:

VTEC = Variable Valve Timing and Lift Electronic Control

· How does VTEC work?

VTEC uses three cam lobes and three corresponding rocker arms for each pair of valves, these are all electronically controlled from the ECU (Engine Control Unit)

The VTEC system can alter not just valve lift, but valve timing as well in response to engine load and driver demand. VTEC operates on intake as well as exhaust valves. The ECU is setup to change to high lift cam profiles at a certain RPM (generally somewhere around 5000rpm, but depends on the model) While all this is happening another intake opens up in the manifold to enable more air into the mixture to fully exploit this different cam profile setup.

The result is a normal engine when driven sensibly, then a beast when you open it up and get the revs above 5000rpm

Since the VTEC system is electronically controlled, various settings can be changed from the ECU. Cam changeover point can be modified from a Plug in box like the VAFC from APEXI. Replacement race spec ECUs raise the rev point and modify fuelling and air flow parameters to fully exploit the VTEC engine.
:hitit:

[Stoneheart]

I know it’s a valve timing thing but I didn’t bother my self knowing any thing about Honda in any day of my life :tongue:

[designo]

you may have VTEC....

but i have VANOS baby! :naughty:

[Black Z]

:booty:

[MONGOOSE]

Mr Aryan thanks buddy nice and good information :bigok:

[TAG]

Mr Aryan,

Thanks you very much for the info!!!

Now this is why we made this forum!!! To give more info for car freaks like me! :)

Good job and thanks!! :bigok: :bigok: :bigok:

[Mr Aryan]

Originally posted by TAG
Mr Aryan,

Thanks you very much for the info!!!

Now this is why we made this forum!!! To give more info for car freaks like me! :)

Good job and thanks!! :bigok: :bigok: :bigok:
you're welcome TAG, i thought you guys didn't want to know anything about Japanese cars like stoneheart..

[MONGOOSE]

Originally posted by Mr Aryan
i thought you guys didn't want to know anything about Japanese cars like stoneheart.. :nono: We want to know everything, give us information as much as you can bro oo ma3alek men ay a7ad. :cheers:

[69CamaroLS1]

Thanx alot budy for the great info, Now you should post a clear honda engine codes (B16,B18,....ETC) what they stand for & which parts are interchangable in the great Honda tech:bigok:

[Stoneheart]

Originally posted by Mr Aryan
you're welcome TAG, i thought you guys didn't want to know anything about Japanese cars like stoneheart..
That makes me the only freak around here :tongue:

[Mr Aryan]

Originally posted by salsa383
Thanx alot budy for the great info, Now you should post a clear honda engine codes (B16,B18,....ETC) what they stand for & which parts are interchangable in the great Honda tech:bigok:

so you wanna go more deep into this?!?! :spaz:
i'll just give you a simple info about the engine codes...

B16......
B = block code like B series
16= 1.6 litter

H22.....
H = block series
22 = 2.2 litter

almost all B16 parts will work with B18 engine and opposite.. ex, engine mounts, driving shafts, cams, valves, valve springs, but not crank and the internal stuff cause they got different stroke
and some of B series engine are not VTEC like the B20 from CRV, but there is a way to make it VTEC, you can use the B16 or B18 head on it with some modification to the block and cylinder head, and you'll have a bigger stroke vtec :naughty:
i've seen one B20 vtec in the states, and i was amaized about the ET he got in his 92 civic! i went and talked to him...
this is what he had:

- B20 block from CRV
- B16 cylinder head
- B16 type R cams and internals
- cold air intake system only!!!!!!!! no headers, no exhaust
he ran 14.3s twice, and 14.4s once!!!!

next time when i get a good article about VTEC engines, i'll post it buddy. :bigok:

[Thug Life]

it's really nice info's brother

but am not into japanese car's fan :tongue:

[ZOSicK]

1.8 Type R is my favourite engine :lildevil:

[Mr Aryan]

Originally posted by BlackSS
1.8 Type R is my favourite engine :lildevil:
it was my dream to have that engine one day, but now i made my 1.8 GSR engine better than the 1.8 type R one :naughty:
ohhh wait!! do i have a 2.0 type R now? :bigok:

[69CamaroLS1]

Originally posted by Mr Aryan
so you wanna go more deep into this?!?! :spaz:
i'll just give you a simple info about the engine codes...

B16......
B = block code like B series
16= 1.6 litter

H22.....
H = block series
22 = 2.2 litter

almost all B16 parts will work with B18 engine and opposite.. ex, engine mounts, driving shafts, cams, valves, valve springs, but not crank and the internal stuff cause they got different stroke
and some of B series engine are not VTEC like the B20 from CRV, but there is a way to make it VTEC, you can use the B16 or B18 head on it with some modification to the block and cylinder head, and you'll have a bigger stroke vtec :naughty:
i've seen one B20 vtec in the states, and i was amaized about the ET he got in his 92 civic! i went and talked to him...
this is what he had:

- B20 block from CRV
- B16 cylinder head
- B16 type R cams and internals
- cold air intake system only!!!!!!!! no headers, no exhaust
he ran 14.3s twice, and 14.4s once!!!!

next time when i get a good article about VTEC engines, i'll post it buddy. :bigok:

Thank you thank you thank you:bigok:

[Royze]

more info about the Vtec system...

once you hit the VTEC ignition point..

which is 6000 rpm in my s2000 :p

you have 3 stages of vtec ... stage 1 the all valves get close to stroke at the same time...stage 2 even closer...and once u hit stage 3...all the valves work at the same time...which gives you more power and believe me

you dont want to drive on a high way goin vtec stage 3 all the way...

iv tried that from dubai to abudhabi... a full tank was empty on 120KM...

but if i didnt vtec through the trip..the tank could've made 390KM..

see how much diffrence that is and how much more fuel the engine is consuming...

almost like turbo tech.

[Stoneheart]

That means the 250hp or what ever the S2000 has wont come out until 6000 RPM’s who needs to rev his engine to 6000 to get 250hp on a daily driven car, while at the same time an LS1 engine will make the same power at around 3000 RPM’s.

[Mr Aryan]

Originally posted by Stoneheart
That means the 250hp or what ever the S2000 has wont come out until 6000 RPM’s who needs to rev his engine to 6000 to get 250hp on a daily driven car, while at the same time an LS1 engine will make the same power at around 3000 RPM’s.
7abibi, the S2000 rev's up to 9000rpm as for the LS1 i guess 6500rpm or whatever....
also no body compares 4 cylinder with 8 cylinder cars, they are totally different classes!!:confused:

[ZOSicK]

to me its like that .. honda's have alot of torque and when they come like 220HP to the engine its 200HP to the wheels which is not somethin easy to get specially stock ..

American cars are different like my car came from the dealer with 350HP Stock i added a cat back and an air intake thats an additional 35 to 40 HP which is nearly 400HP but i dont truely have that coz thats HP to the engine .. i might really have 330HP with all the mods i have and thats what makes HONDA's really fast specially when they come supercharged or turbo'd :naughty:

[Mr Aryan]

Originally posted by BlackSS
what makes HONDA's really fast specially when they come supercharged or turbo'd :naughty:

:bigok:

[Royze]

Originally posted by BlackSS
to me its like that .. honda's have alot of torque and when they come like 220HP to the engine its 200HP to the wheels which is not somethin easy to get specially stock ..

American cars are different like my car came from the dealer with 350HP Stock i added a cat back and an air intake thats an additional 35 to 40 HP which is nearly 400HP but i dont truely have that coz thats HP to the engine .. i might really have 330HP with all the mods i have and thats what makes HONDA's really fast specially when they come supercharged or turbo'd :naughty:

respect :bigok:

stone heart...as u know the s2000 was made for the track and the twisties...i can take you're regular LS1 engine on any curve ...any day...

and for ur info... my car which has minor mod's such as exhaust and strut bars eat Lumina SS on a daily basis...its not in the s2000's daily diet anymore..

not enough nutritons for me

:naughty:

*awating to be flamed back :booty: *

[ZOSicK]

Royze dont worry no one will flame u coz here in bahrain we have some really unbeleivable fast honda's and they r well respected for eg Mr Aryan's Civic and lots more like prelude's, 91 CRX's and so

honda's r hard to beat when it comes from zero specially for V8's coz they have crazy wheel spins but from a roll on its always a dirfferent story

V8's r very difficult to beat without NOS or Forced Inductions always remember that and im talkin about sport ones not sedan's
:bigok:

[Stoneheart]

Originally posted by Mr Aryan
7abibi, the S2000 rev's up to 9000rpm as for the LS1 i guess 6500rpm or whatever....
also no body compares 4 cylinder with 8 cylinder cars, they are totally different classes!!:confused:
Ahmady a stock LS1 will peak at 5200 and with some intake and exhaust mods it will at 5500 honestly I never seen an LS1 peak past that without internal mods so revving it over 6000 is nonsense. And the second thing im not comparing 4 bingers with V8’s im comparing technologies.

[Stoneheart]

Originally posted by BlackSS
to me its like that .. honda's have alot of torque and when they come like 220HP to the engine its 200HP to the wheels which is not somethin easy to get specially stock ..

Where did you learn that?

As every one knows most NA 4 cylinder engines lack the torque thing they have to rev so high to make HP, it’s the V8’s that has massive low end torque. If you reed the book Modifying Small Block Chevy Engines By John Lingenfelter you’ll understand what im talking about.

[ZOSicK]

Originally posted by Stoneheart
Where did you learn that?

As every one knows most NA 4 cylinder engines lack the torque thing they have to rev so high to make HP, it’s the V8’s that has massive low end torque. If you reed the book Modifying Small Block Chevy Engines By John Lingenfelter you’ll understand what im talking about.

thats what i have been told i mean bout the honda's and i would love to read that book if u had it or tell me where can i get my hands on one :bigok:

[Stoneheart]

Originally posted by BlackSS
thats what i have been told i mean bout the honda's and i would love to read that book if u had it or tell me where can i get my hands on one :bigok:
Here you go mate you can order it from amazon.com

It’s a really nice book to read, you’ll know lots of stuff about the SBC engine :bigok:


http://www.amazon.com/exec/obidos/tg/detail/-/155788238X/102-9345691-2236137?v=glance

John Lingenfelter is the founder of Lingenfelter Engineering, and he was a great SBC racer and a master engine builder.

[ZOSicK]

thanx a bunch Stoneheart :bigok:

John Lingenfelter is da man when it comes to chevy's :lildevil:

[designo]

i feel that love is in the air! :beating:

[Ottoman]

I just wanna add:

ppl think B16 and "Vtec's" make power because of the Vtec engagement... that is only partially true

there are SOHC Vtec's and they are pretty slow

the trick is all in the Head...

the B16's and b18c's and such all shar the same head, it's the design of the head that flows air incredibly effeciently with minimal turbulance and loss

in fact many pro racers actually remove the vtec with "VTEC killer cams" they get the b16 for it's head not it's Vtec...
with a good port and polish it's truley and amazing engine

the reason they rev so high is because of their Rod/Stroke ratio which makes them very well balanced and puts minimal unnecsseary forces on the rods and other internals..

the S2000 has the best flowing head of any Stock production engine out there..

in fact ppl have tried putting cold air intakes and such on the car and have actually LOST power from it... Dyno proven.. s2000 is one of the best cars to come stock from the factory.. there's not much tuning u can do unless u go with Forced Induction..


as for Torque... discplacement yields torque.. obviously 5.7 liters will have much more torque then 1.6..
but torque fools u... torque makes it feel like your car is faster then it really is

I have a bmw 325iS and daily driven it feels much faster then my honda... but my honda is actually faster then it...


if u think about it, there's not much technology at all in the LS1 it's still the same old "brute force" technique.. the only thing that's changed in the 40 or 50 some odd years is the ignition system and Fuel injection... other then taht it's pretty much the same old thing... :crying:

[Mr Aryan]

Originally posted by Ottoman
I just wanna add:

ppl think B16 and "Vtec's" make power because of the Vtec engagement... that is only partially true

there are SOHC Vtec's and they are pretty slow

the trick is all in the Head...

the B16's and b18c's and such all shar the same head, it's the design of the head that flows air incredibly effeciently with minimal turbulance and loss

in fact many pro racers actually remove the vtec with "VTEC killer cams" they get the b16 for it's head not it's Vtec...
with a good port and polish it's truley and amazing engine

the reason they rev so high is because of their Rod/Stroke ratio which makes them very well balanced and puts minimal unnecsseary forces on the rods and other internals..

the S2000 has the best flowing head of any Stock production engine out there..

in fact ppl have tried putting cold air intakes and such on the car and have actually LOST power from it... Dyno proven.. s2000 is one of the best cars to come stock from the factory.. there's not much tuning u can do unless u go with Forced Induction..


as for Torque... discplacement yields torque.. obviously 5.7 liters will have much more torque then 1.6..
but torque fools u... torque makes it feel like your car is faster then it really is

I have a bmw 325iS and daily driven it feels much faster then my honda... but my honda is actually faster then it...


if u think about it, there's not much technology at all in the LS1 it's still the same old "brute force" technique.. the only thing that's changed in the 40 or 50 some odd years is the ignition system and Fuel injection... other then taht it's pretty much the same old thing... :crying:


WOW!!!

[SS]

as mentoined earlier you really can;t compare american V8s cars with hondas or any 4 cylinder car, even though im biased I still respect hondas a lot for the technology and design put into them, but again you really can;t compare coz they're totally different cars, weight, engine configuration, size of car, traction., etc play a big role in how fast a car is and every engine has different characteristics..i guess it all goes down to taste and what you're goal is...

[designo]

i think hondas are the best cars to play with!

:bigok:

[SS]

older american cars are easier and more fun to modify and play with, the parts are very cheap and can give you very good results..you can easily build a 12 sec car if you've got the money and know how:naughty:

[Thug Life]

Originally posted by SS
you can easily build a 12 sec car if you've got the money and know how:naughty:

american muscel baby:lildevil: :lildevil: :naughty:

[ZOSicK]

Originally posted by Ottoman
I just wanna add:

ppl think B16 and "Vtec's" make power because of the Vtec engagement... that is only partially true

there are SOHC Vtec's and they are pretty slow

the trick is all in the Head...

the B16's and b18c's and such all shar the same head, it's the design of the head that flows air incredibly effeciently with minimal turbulance and loss

in fact many pro racers actually remove the vtec with "VTEC killer cams" they get the b16 for it's head not it's Vtec...
with a good port and polish it's truley and amazing engine

the reason they rev so high is because of their Rod/Stroke ratio which makes them very well balanced and puts minimal unnecsseary forces on the rods and other internals..

the S2000 has the best flowing head of any Stock production engine out there..

in fact ppl have tried putting cold air intakes and such on the car and have actually LOST power from it... Dyno proven.. s2000 is one of the best cars to come stock from the factory.. there's not much tuning u can do unless u go with Forced Induction..


as for Torque... discplacement yields torque.. obviously 5.7 liters will have much more torque then 1.6..
but torque fools u... torque makes it feel like your car is faster then it really is

I have a bmw 325iS and daily driven it feels much faster then my honda... but my honda is actually faster then it...


if u think about it, there's not much technology at all in the LS1 it's still the same old "brute force" technique.. the only thing that's changed in the 40 or 50 some odd years is the ignition system and Fuel injection... other then taht it's pretty much the same old thing... :crying:

now thats really valuable thanks alot i enjoyed reading it :bigok: