Honda R18 i-VTEC showing intake valve action
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- Опубликовано: 8 май 2018
- This shows how the intake valves operate independently when oil control valve is not energized, as compared to them operating in unison with the oil control valve energized. In unison they are in high output mode in the R18 and R20 engines.
Vtec cam in R engine activated between 1 - 3.5K rpm. Other than that, normal high performance cam
During vtec activate, the lifting of an intake valve reduced while timing of another intake valve prolonged. Both to activate Atkinson cycle motor
To activate vtec, need certain conditions for ecu to give feedback.
Basically not all the time that vtec should activate. U need to cruise or give low load for this engine to give you good mileage
Between 3.5K until 5K rpm, the max torque achieved with long intake manifold. at higher than 5.2K rpm, short intake manifold take over to give high hp. But cannot match traditional NA Vtec high rpm power, unless forced induction (i guess)
If you used to push your engine hard, then the ecu will always give you power which is quite fast for an 1.8 NA angine. just install electrical grounding equipment, surely you can feel the R18 power
Thanks for the video, I was doing valve adjustments on my R18 engine with 147K miles. I noticed that one of the intake valve was tight and the other was in tolerance and thought I had to re-adjust. Then I rechecked at TDC and both were in tolerance and got me confused. It was my first time inside an R18 engine, your video explained a lot.
thanks
There is a great difference between this "R" series and the more powerful and popular "type-R" engines. Readers can learn more about both of these engines by simple research on the internet.
My r18a1 is at 283k and still pulling strong! :)
I can already hear the cross over
VTEC confirmed
i have a problem with my r20a3......engine is feeling super sluggish and struggling to rev (whilst in gear) it eventually gets there but it's super sluggish
After this test are you in mesure to tell us how to leave the selenoid open and being kinda vtec killer on a switch?
My understanding is that you can do that by simply providing power to the solenoid. But I am not 100% sure this would be a good idea to do this all the time. I do not know if the solenoid is designed to function for extended periods. It might be. But I am not sure. Hope that helps.
charosenz thanks for that quick awnser , if i understant all you did is giving a 12v to the selenoid on your vid? Obviouslly thers no oil pressure to open it so i guess you just send power to the selenoid plug?
@@maxdegarie1065 tes. By providing power to the solenoid it moves a piston that allows oil to flow to the piston in the rocker arm locking them together. When power is stopped spring pressure allows the piston to retract allowing the intake vales to move independently.
@@charosenz soleniod would work fine for longer periods. But ignition time and injection quantity may be mis calculated by ecu if you open vtec manually
@@kursatcoban since I do not use the OEM ECU it is not a problem. I use and aftermarket ECU made by SDSEFI.COM
0:22, it has a good beat for a RAP song, I was waiting for the lyrics to start. 😁
So it’s like l15. 1 valve wide open and the other half opened and when the vtec is engaged it goes with both fully open. Im i right?
It has more to do with the timing of the valves than how much they open. There is a good video on the web that shows this. I'll try to find a link to it and posted it.
charosenz thanks
Here is a great video that explains it best. ruclips.net/video/Px0_6-Btx3Y/видео.html
which one gives it more power independent or unison
Here is a reload of the Honda Factory vid that shows the answer in detail.
ruclips.net/video/Px0_6-Btx3Y/видео.html (together is high output).
Is this the z1 or a1
Z1. Here is the wiki. en.m.wikipedia.org/wiki/Honda_R_engine
So basically 12 valve mode just like d17a2
Nope
Yes it's similar to a D17A2 and the JDM D17A
nope.
so hard to tell if you dont know what to look for
So R series still have vtec? When the vtec will kick in?
3500 rpm
The new R series dont.
@@tylertelford1088 the new ones are turbocharged
@@TheRedMammon I know. That's not V-Tec
@@tylertelford1088 yup
The explanation is wrong, when the vtec solenoid locks the pin causing the rockers to stick together is actually the low load situation where the right valve has it's own lobe all the time, no matter if vtec is on or off, and the left valve follows the central lobe with offset timing.
In high load conditions, the left valve follows that lobe on the left side of the central one, and the middle rocker floats independently without being connected to any of the valves.
The thing is your compressor can't simulate the oil pressure correctly, and in reality the valves have the same lift, just the timing differs...your video shows q sticky rocker that does not move correctly
You will have to disagree with Honda. I will attach a link to the Honda video that shows what you say, is wrong. Please take time to watch this Honda Video. ruclips.net/video/Px0_6-Btx3Y/видео.html
@@charosenz well exactly this video shows what i say... When vtec is activated the rockers dance differently following 2 different types of lobes for the low load situation, a kind of atkinson.
When in high load situation The pin retracts and the rockers follow 2different lobes that have an identical lift and timing profile so both behave the same, but the middle rocker keeps following the central lobe but without being connected to any Valve.
You said that vtec is activated when all the rockers move together but it is actually the other way round
If you watch closely that video never shows all 3 rockers moving identically z only the ones that sit directly on the intake valves, but the middle one moves differently, but in your video at the second part all three rockers move the same, which is weird, maybe the engine you filmed has an aftermarket camshaft with different lobes.
Watch closely and you'll notice that the 2 videos show different movement behaviours
@@vladdutz20 You really should pause the video at about 3:04 - 3:06. Honda makes it very clear here by showing the valve action in both high load and low load events. Honda states and shows that in the economy (low) mode on the left of the screen that the two intake valves are not functioning in unison. On the right side of the screen they clearly show the two intake valves locked in unison during high load events. I am not sure if you are just ignoring this detail or you are overthinking it. But Honda makes it clear that in high load ops, the intakes are locked in unison.
@@charosenz yes, that's what I'm saying, but actually at high load each intake valve is operated via it's own lobe, those lobes having identical profiles, but the rockers are not fused together with the vtec pin as you say in your video.
When vtec is activated at part load the pin locks together the middle and the left rockers that follow the middle lobe with offset timing and acts ONLY on the left intake valve, while the right intake valve still follows that right lobe independently of the other 2 lobes
Vtec e
Why is it so loud
Your hearing mostly the sound from the starter and since its on a test stand you hear that more than you do when it is in the car.....
R18 ivtec is a joke. Cams are locked until 3500 rpm them they unlock.
Still very reliable, its just boring
@@leeeeeee2796 sometimes when I am lonely I will shave one leg so it feels like I’m sleeping with a woman 👩🏼
@@mattycheeze4131 wtf dude hahaha
Have seen them go over 300k so I'd say they're fine
@@mattycheeze4131 To think of all the choices I made today and other days in order for me to read this comment.. life is truly a mistery.