The cam lobes are always all spinning at the same rate, however the center larger cam lobe is only in use (in contact) once the pins connect the rocker arms.
Yeah some of the early vtec engines are notorious for burning oil (a lot of older Honda engines, in fact). As long as the system is fully lubricated you're okay, but all it takes is a short period of time with no oil, and the engine's done. It's best to monitor the level, I check mine every time I get gas. Takes 2 minutes and can save you a lot of money if the oil's too low.
thanks man i love everything about cars and i learned a lot from you. every time i need an explanation about some part of the car first i search to see if u have video for it or not. great work man.
I used to have a car with DOHC VTEC, it was gutless with no torque whatsoever. I have to wind it all the time to VTEC for the car to accelerate. It was tiring driving the car that way.
Likely would require lobes on both. I believe there are systems that just alter the intake, but many alter both. It's "easier" to push out air than to pull in air. The pressure difference is greater during the exhaust stroke so it wants to escape.
Good description of variable lift. Also, timing is advanced and duration is extended by the shape of the high rpm cam lobe. The valve overlap that would result from using this lobe at low rpm would cause a stumbling idle, less power and poor mileage.
i love your videos ! i go from not having heard of something , to understanding it in one or two viewings! im in the middle of my goal of watching every single one of your videos in a week ! i love them! thankyou so much !
At a very low level perhaps, but not really. It isn't powered by exhaust gases, which increases efficiency like a turbo. It increases the amount of air per intake stroke, at high RPM, but a turbo adds significantly more air.
I understand what you're saying, and it does seem like there would be quite a shear force on the pins, but really these are pretty low mass objects and there movements are pretty short. With enough pressure it doesn't seem unreasonable to me for the pins to pop into place.
I love these videos you make, so technical and informational yet qualified to be in a book called "Cars for Dummies" because its so easy to listen and learn from you. Keep it up man.
It's a 99, it does not have VTEC. I like it because it's lightweight, has decent power, gets good gas mileage (for a '99, I average around 28-30 mpg a tank), tons of space in the back, you can fit a whole bike without taking the front tire off - I've fit a 7 foot xmas tree in it before and still shut the hatch. There's a lot to love!
Haha, I promise I would if I could. I just graduated and start work in less than a month. And I'll be traveling for the next three weeks. On top of keeping up with comments/questions/suggestions, it's difficult to find the time. I struggle sometimes just to get one every week, but I'm trying my best to keep that going. For now, my apologies, perhaps one day I can upload more regularly.
I've gotten this suggestion a few times recently. I just feel the only thing I lack is the time, patience, and writing ability. But that's no biggie, maybe one day haha
+dylan blake boiracers (the people who put fart can exhausts, non-functional intakes and neon lights on their Honda econoboxes) usually brag about how fast they think they are by talking about how their "VTEC kicks in pretty hard, yo".
let's take it a couple steps further "I de-yo'd my Civic, now it gets 3 extra MPG per trip and I've not noticed a bloody thing!" from a hard-driver who bloody should notice
Basically the intake strokes on lower RPM have plenty of time to pull in enough air, but why use more energy than required and open up them up more, compress the springs more, when it isn't necessary? I think you're thinking along the right path.
The best engineering video series out there mate! I have been hooked to your videos for the last 2 hours now... Learnt a lot. Keep it coming. Thank you so much! -Shyam India
It actually is a pretty cool technology, and it's quite useful. That said, almost everything is over-hyped by marketing. Simply having VTEC does not mean your car is uber fast haha.
it's an excellent invention, comes on at higher RPMs (like passing) to give you that extra boost of power (usually about 20-30%) and shuts off during normal driving, which = great fuel efficiency. it's brilliant.
now a fays it is a small seprated cam that is controlled by a electro motor that cam change the position of the rocker arm and you get the same result longer opening the intake good movie keep up the good work
For sure! There are some vocal exercices, you can find it out on the internet, about vocal techniques. This will help you get better tones in your voice, it's not mandatory, its just something that I think that can make your videos even better!
It's a computer that controls everything, engine management, diagnostics, safety systems, everything. Being that my knowledge of computer programing doesn't go beyond Fortran, unfortuntately no, I don't know how to write all the codes, or explain them. But if you understand how a computer works, it's no different, just controls a vehicle rather than a monitor.
I may have misguided you in the other video. VTEC does use rocker arms. That said, there are many ways of achieving the same result, thus different companies do this in different ways.
for the person asking about the 96 integra if you have a ls integra there is no v-tec just a 1.8L B18. But if you have a gsr or a type-r those have v-tec. Look for the solinoid on the top left of the valve cover if there is one you do have v-tec.
How do VTEC engines hold up over time? Small pins being pushed into slots by oilpressure...? To me it sounds like something that could break after some time.
98 Acura cl 3.0 vtec v6 150,000 miles I've owned car for two years very dependable car , but just like anything moving parts do wear. I follow maintenance schedule and change my oil every 3 to 4000 miles .
Having raced Integra touring cars in endurance racing, you can program the Vtec timing for qualifying set up, having it kick in earlier and race set up, later, in order to save fuel over long stints, its basic but very useful, and it goes brrrrrrrWAAAAAAA
Sure, just delete one rocker arm, cam lobe, and valve. It'd look pretty similar. That said, VTEC is about optimizing airflow, so the right step for a 2 valve/cylinder engine to optimize airflow in my opinion would be to increase the number of valves.
You sir are god :D Thank you for this excellent explanation on VTEC technology. I'm a huge fan of Honda. I knew how VTEC works but now it's more clear. Also thanks for the other videos. Cheers :D
Nice explanation, but a little off. Not trying to be critical. The locking pistons do not both come from the center rocker. The main locking piston with oil pressure applied comes from an end rocker, which pushes on the piston in the middle floating rocker, and locks the third rocker in place. I hope that helps.
Nissan was the 1st to put Variable valve timing into a full production engine in 1989 with the VG30DE/VG30DETT that is most commonly found in the 300ZX.
Awesome video. When the engine operates at low rpms (under vtec), the camshaft lobes (left and right) are uneven, this causes the valves to open and close unevenly in order to create an air swirl which provides better fuel optimisation. Please put a vtec head on your b18 integra :D.
Man, your videos are each time better! Congrats! Train more your vocal imposition that it will be even better! And so the dual VVT-i (Toyota) I suppose that is the same in both in and out valves, right? Regards!
Haha I love saying VTEC just kicked in yo when im in my friends accord! :P VTEC, MIVEC (Mitsubishi), VVTi (Toyota), and CVTc (Nissan) are some of the variable valve technologies names
This video kicked in pretty hard yo
nice one!
VTEC AIN'T GOT NOTHIN ON THAT MIVEC YOOOO. My civic will do 0-60 in 1.2 seconds homie.
Jkjk i'd never own a honda.
The cam lobes are always all spinning at the same rate, however the center larger cam lobe is only in use (in contact) once the pins connect the rocker arms.
You give very understandable explanations. Best VTEC tutorial on you tube thus far. Great work man
Thanks for the video. Now I finally understand how VTEC works, before this I just assume it was either unicorn farts or black magic. :P
Moog still thinks its unicorns and so do I!
BLACK MAGIC :DDDDD Dbest thing i heard today :D
Yeah some of the early vtec engines are notorious for burning oil (a lot of older Honda engines, in fact). As long as the system is fully lubricated you're okay, but all it takes is a short period of time with no oil, and the engine's done. It's best to monitor the level, I check mine every time I get gas. Takes 2 minutes and can save you a lot of money if the oil's too low.
Yep, it's actually already on my suggestions list. Thanks!
thanks man i love everything about cars and i learned a lot from you. every time i need an explanation about some part of the car first i search to see if u have video for it or not. great work man.
VTEC just kicked in yo.... joking aside this is pretty smart engineering =)
I used to have a car with DOHC VTEC, it was gutless with no torque whatsoever. I have to wind it all the time to VTEC for the car to accelerate. It was tiring driving the car that way.
Read the "Future Plans" section on my website under FAQs. The link is in my description. Should help you out, as well as the FAQs.
congrats on your channel's success, no one else is able to simplify concepts that we all have heard of, but few understand.
why do you look 16 but 36 at the same time? lol
he's 30
He's 50
he’s 70
He’s 90
Fifteen Years! That is how long I have been waiting for a good explanation of how VTEC worked. Thank you.
vtec is just great !
Very welcome! Glad you enjoyed the video!
You're welcome, glad you find them helpful!
Likely would require lobes on both. I believe there are systems that just alter the intake, but many alter both. It's "easier" to push out air than to pull in air. The pressure difference is greater during the exhaust stroke so it wants to escape.
Good question. I would assume it has to do with releasing the oil pressure, and this may create a sort of vacuum, pulling the pins back in.
You can do the same for both camshafts. Yes, graduated with my ME last May.
Good description of variable lift. Also, timing is advanced and duration is extended by the shape of the high rpm cam lobe. The valve overlap that would result from using this lobe at low rpm would cause a stumbling idle, less power and poor mileage.
Damn. You seriously have a video for everything. Good job!
i love your videos ! i go from not having heard of something , to understanding it in one or two viewings! im in the middle of my goal of watching every single one of your videos in a week ! i love them! thankyou so much !
knew the basics of vtec, just not exactly how it works. Today I increased my knowledge of vtec and how it works! awesome vid
I've been watching your videos alot and I feel like you teach better than all my engineering professors.
At a very low level perhaps, but not really. It isn't powered by exhaust gases, which increases efficiency like a turbo. It increases the amount of air per intake stroke, at high RPM, but a turbo adds significantly more air.
I understand what you're saying, and it does seem like there would be quite a shear force on the pins, but really these are pretty low mass objects and there movements are pretty short. With enough pressure it doesn't seem unreasonable to me for the pins to pop into place.
I love these videos you make, so technical and informational yet qualified to be in a book called "Cars for Dummies" because its so easy to listen and learn from you. Keep it up man.
It's a 99, it does not have VTEC. I like it because it's lightweight, has decent power, gets good gas mileage (for a '99, I average around 28-30 mpg a tank), tons of space in the back, you can fit a whole bike without taking the front tire off - I've fit a 7 foot xmas tree in it before and still shut the hatch. There's a lot to love!
Impressive, thanks for watching! Glad you're learning :)
You make things very simple and easy to understand. Thank you!
Happy to hear it, thanks for watching!
Haha, I promise I would if I could. I just graduated and start work in less than a month. And I'll be traveling for the next three weeks. On top of keeping up with comments/questions/suggestions, it's difficult to find the time. I struggle sometimes just to get one every week, but I'm trying my best to keep that going. For now, my apologies, perhaps one day I can upload more regularly.
Everyone knows it's just multiple unicorns all farting at once. According to Mighty Car Mods
lmao
Awesome, glad you like them!
I've gotten this suggestion a few times recently. I just feel the only thing I lack is the time, patience, and writing ability. But that's no biggie, maybe one day haha
Hmm. . . Brilliant! Electronically variable camshaft. Never understood this concept until now. Thank you!
i am so educated :D but u forgot to say the necessary "yo" after referencing VTEC, such as "VTEC kicked in yo" or "my Honda's got VTEC yo" lol
Gslash25 could you explain this "yo" joke to me
+dylan blake boiracers (the people who put fart can exhausts, non-functional intakes and neon lights on their Honda econoboxes) usually brag about how fast they think they are by talking about how their "VTEC kicks in pretty hard, yo".
let's take it a couple steps further "I de-yo'd my Civic, now it gets 3 extra MPG per trip and I've not noticed a bloody thing!" from a hard-driver who bloody should notice
Props to honda for making a very reliable engine at 100hp/liter. I saw your b18b1 in your flywheel video. Looks good and keep bringing the videos!
120hp/liter ;)
These have been suggested before, I'll consider looking into it!
I feel exactly the same i have used these videos to help fix my car and understand how it all works THANKS A LOT!!
I'm glad you did as well! Thanks!
You have no idea how many discussions I had with kids back in the day about this topic.
Basically the intake strokes on lower RPM have plenty of time to pull in enough air, but why use more energy than required and open up them up more, compress the springs more, when it isn't necessary? I think you're thinking along the right path.
The best engineering video series out there mate! I have been hooked to your videos for the last 2 hours now... Learnt a lot. Keep it coming. Thank you so much!
-Shyam
India
Thanks man. I just bought a RSX type S a few months a go and always wondered how the v-tech could change valve lift and timing.
It actually is a pretty cool technology, and it's quite useful. That said, almost everything is over-hyped by marketing. Simply having VTEC does not mean your car is uber fast haha.
Same principle, yes, though I don't know who did it first. Those things are always debated. Reason I chose VTEC is because I drive a Honda.
it's an excellent invention, comes on at higher RPMs (like passing) to give you that extra boost of power (usually about 20-30%) and shuts off during normal driving, which = great fuel efficiency. it's brilliant.
now a fays it is a small seprated cam that is controlled by a electro motor that cam change the position of the rocker arm and you get the same result longer opening the intake good movie keep up the good work
For sure! There are some vocal exercices, you can find it out on the internet, about vocal techniques. This will help you get better tones in your voice, it's not mandatory, its just something that I think that can make your videos even better!
Ahh, you are correct. Thank you for pointing this out!
You were so young...
im planning to buy a Honda Accord and i'll make sure its a VTEC Thanks for the explanation!
It's a computer that controls everything, engine management, diagnostics, safety systems, everything. Being that my knowledge of computer programing doesn't go beyond Fortran, unfortuntately no, I don't know how to write all the codes, or explain them. But if you understand how a computer works, it's no different, just controls a vehicle rather than a monitor.
I've got some FAQs on my website (see description) to answer questions like yours. Cheers!
Actually if I'm not mistaken V-tec is not variable valve timing, its variable valve lift. Good videos, very informative.
The oil from the solenoid presses the pins outward to lock the rocker arms.
The RPM range varies for different vehicles
Thanks! Glad to hear!
I may have misguided you in the other video. VTEC does use rocker arms. That said, there are many ways of achieving the same result, thus different companies do this in different ways.
Before I watched one video I subscribed because I needed to. I'm glad I stumbled upon your videos
for the person asking about the 96 integra if you have a ls integra there is no v-tec just a 1.8L B18. But if you have a gsr or a type-r those have v-tec. Look for the solinoid on the top left of the valve cover if there is one you do have v-tec.
Dude....Thanks for making all these amazing videos. I love cars and have wondered about how some of these systems work. I will subscribe.
High RPM, not necessarily high speed. First gear might top out around 30 mph. But yes, it doesn't do anything at low RPM.
How do VTEC engines hold up over time? Small pins being pushed into slots by oilpressure...? To me it sounds like something that could break after some time.
IamMagPie ikr, why not just slide the camshaft up and down with an electric linear actuator or something.
98 Acura cl 3.0 vtec v6 150,000 miles I've owned car for two years very dependable car , but just like anything moving parts do wear. I follow maintenance schedule and change my oil every 3 to 4000 miles .
Only teacher that is a good artist
So that's how the vtec kicked in yo!
Great vid, very informative :)
Having raced Integra touring cars in endurance racing, you can program the Vtec timing for qualifying set up, having it kick in earlier and race set up, later, in order to save fuel over long stints, its basic but very useful, and it goes brrrrrrrWAAAAAAA
So glad I stumbled upon this channel, Keep up the good work!
Awesome, love the car.
Sure, just delete one rocker arm, cam lobe, and valve. It'd look pretty similar. That said, VTEC is about optimizing airflow, so the right step for a 2 valve/cylinder engine to optimize airflow in my opinion would be to increase the number of valves.
Oil leaks aren't good, but I don't see why VTEC wouldn't work as long as you have sufficient oil. The RPM depends on the engine.
You sir are god :D Thank you for this excellent explanation on VTEC technology. I'm a huge fan of Honda. I knew how VTEC works but now it's more clear. Also thanks for the other videos. Cheers :D
Nice explanation, but a little off. Not trying to be critical.
The locking pistons do not both come from the center rocker.
The main locking piston with oil pressure applied comes from an end rocker, which pushes on the piston in the middle floating rocker, and locks the third rocker in place.
I hope that helps.
Nice lessons. I think that the tutors in our institutes coud use it to teach the students about new technologies in the automotive world.
Nissan was the 1st to put Variable valve timing into a full production engine in 1989 with the VG30DE/VG30DETT that is most commonly found in the 300ZX.
You're welcome!
Thanks you, and thanks for sharing!
I suppose I do need to work on those at some point. Do the google ones not work well at all?
Well, vtec does stand for "Variable Valve Timing and Lift Electronic Control"
Oh, I'm not sure. I would assume it's fine as long as you've got oil pressure.
Love you're stuff. Just posted a small writeup on your site and channel. Keep plucking away at what you do bro!
Awesome video. When the engine operates at low rpms (under vtec), the camshaft lobes (left and right) are uneven, this causes the valves to open and close unevenly in order to create an air swirl which provides better fuel optimisation.
Please put a vtec head on your b18 integra :D.
Thanks, best # out there.
Thanks, I try my best!
That is the best explanation I've ever heard.
Subscribed before this video due to useful information but now that you posted information in this video about how this works. You are smart! SuBBED
I really wish honda would make a V8 with vtech that would be awesome!... keep up the good work!!!!
nice 1 man
i am a rookie and has to go way further
thanks for posting such vids, sir
Thanks for the lesson... I'll be watching lots of your vids, you're a really good teacher!
You can save fuel at lower RPMs by using less air, I believe.
Man your videos are awesome...thank you!!!-greetings from Lebanon
First introduced in the NSX!!!!! Love that car
You are a great visual artist, and pretty smart too.
No - " hello everyone and welcome" 😀. Good video, I understood it completely
Interesting, I think someone else said theirs did too.
Yep!
length of the middle rocker arm is different in the 2 diagrams....but i get ur point...well xplained
Seems pretty high. But sadly I just have a standard dohc setup. So do you rev up to 8k or so?
Man, your videos are each time better! Congrats! Train more your vocal imposition that it will be even better! And so the dual VVT-i (Toyota) I suppose that is the same in both in and out valves, right? Regards!
Just want to say thank you on the great explanation!
most cars have this now a days, they go by different names, but good video!!
Haha I love saying VTEC just kicked in yo when im in my friends accord! :P VTEC, MIVEC (Mitsubishi), VVTi (Toyota), and CVTc (Nissan) are some of the variable valve technologies names
I really enjoy your videos. Thank you for making them.
Depending on which 1.8L variant, looks like somewhere between 4500 and 5500.