Uploaded June 2021 | Updated September 2026, 2 weeks ago
Here I explain VTEC on a Honda J35 engine is a SOHC VTEC V6 engine. On the Honda J35 engine, the VTEC cam profile is on the intake side only, which I talk about in this video. Read below for more info...
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What does it stand for and what is it?
VTEC stands for: "Variable Valve Timing & Lift Electronic Control"
What does it do?
The VTEC system provides the engine with valve timing optimized for both low and high RPM. So higher performance at high RPM, and lower fuel consumption at low RPM.
Who uses it?
VTEC is a Honda specific system or Honda Technology. Similar manufactures have similar systems, but nothing with the explicit VTEC name due to trademark.
How does it work?
Think of it as providing two cam profiles. One for fuel economy and one for performance. (A cam profile is just the length of the cam lobe)
It's like a typical "variable valve timing" (VVT) system but it alters the camshaft profile/valve lift.
The short-lift profile: opens the valves shorter and for a shorter time.
The high-lift profile: opens the valves further and for a longer time.
In basic form, the single cam lobe and follower/rocker arm of a conventional engine is replaced with a locking multi-part rocker arm and two cam profiles: one optimized for low-RPM stability and fuel efficiency, and the other designed to maximize high-RPM power output.
The primary rocker arm contains the VTEC switching piston, while the secondary rocker arm contains the return spring.
How is it activated?
VTEC doesn't kick in a set load, lots of things are taken into consideration by the ECU.
The switching operation between the two cam lobes is controlled by the ECU which takes account of engine oil pressure, engine temperature, vehicle speed, engine speed and throttle position.
The switch-down back from high to low RPM cams is set to occur at a lower engine speed than the switch-up to avoid a situation in which the engine is asked to operate continuously at or around the switch-over point.
What happens when VTEC is activated?
When the conditions are met, a solenoid is actuated that allows oil pressure from a spool valve to operate a locking pin which binds the high RPM rocker arm to the low RPM ones. From this point on, the valves open and close according to the high-lift profile, which opens the valve further and for a longer time.
#Honda #VTEC #SaturnVue
Video Title: Honda VTEC Explained - A Visual Example
Video File Created Date: Saturday, 5 June, 2021 (Video may or may not have been captured on this date, it shows the date the video was last converted.)
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Video Tags:
honda, vtec, explained, visual, example, honda vtec, honda vtec explained, j series engine, honda j35, honda vtec sound, honda vtec kick in, honda vtec meme, honda vtec turbo, honda vtec compilation, honda vtec engine, honda vtec acceleration, vtec kicked in, vtec sound, vtec kicked in yo, vtec compilation, vtec meme, vtech kicking in, vtec explained, vtec turbo, saturn vue, cam profile, engine 101, vtec 101, what is vtec, how to, vtec tutorial, sohc, dohc, v6
Here I explain VTEC on a Honda J35 engine is a SOHC VTEC V6 engine. On the Honda J35 engine, the VTEC cam profile is on the intake side only, which I talk about in this video. Read below for more info...
----------
What does it stand for and what is it?
VTEC stands for: "Variable Valve Timing & Lift Electronic Control"
What does it do?
The VTEC system provides the engine with valve timing optimized for both low and high RPM. So higher performance at high RPM, and lower fuel consumption at low RPM.
Who uses it?
VTEC is a Honda specific system or Honda Technology. Similar manufactures have similar systems, but nothing with the explicit VTEC name due to trademark.
How does it work?
Think of it as providing two cam profiles. One for fuel economy and one for performance. (A cam profile is just the length of the cam lobe)
It's like a typical "variable valve timing" (VVT) system but it alters the camshaft profile/valve lift.
The short-lift profile: opens the valves shorter and for a shorter time.
The high-lift profile: opens the valves further and for a longer time.
In basic form, the single cam lobe and follower/rocker arm of a conventional engine is replaced with a locking multi-part rocker arm and two cam profiles: one optimized for low-RPM stability and fuel efficiency, and the other designed to maximize high-RPM power output.
The primary rocker arm contains the VTEC switching piston, while the secondary rocker arm contains the return spring.
How is it activated?
VTEC doesn't kick in a set load, lots of things are taken into consideration by the ECU.
The switching operation between the two cam lobes is controlled by the ECU which takes account of engine oil pressure, engine temperature, vehicle speed, engine speed and throttle position.
The switch-down back from high to low RPM cams is set to occur at a lower engine speed than the switch-up to avoid a situation in which the engine is asked to operate continuously at or around the switch-over point.
What happens when VTEC is activated?
When the conditions are met, a solenoid is actuated that allows oil pressure from a spool valve to operate a locking pin which binds the high RPM rocker arm to the low RPM ones. From this point on, the valves open and close according to the high-lift profile, which opens the valve further and for a longer time.
#Honda #VTEC #SaturnVue
Video Title: Honda VTEC Explained - A Visual Example
Video File Created Date: Saturday, 5 June, 2021 (Video may or may not have been captured on this date, it shows the date the video was last converted.)
-- Video uploaded and managed using YouTube Bulk Uploader for the Lazy!
-- Manage and Auto-Tag your YouTube videos offline... Then upload!
-- ginkosolutions.com/youtube-bulk-uploader
-- GinkoSolutions.com
Video Tags:
honda, vtec, explained, visual, example, honda vtec, honda vtec explained, j series engine, honda j35, honda vtec sound, honda vtec kick in, honda vtec meme, honda vtec turbo, honda vtec compilation, honda vtec engine, honda vtec acceleration, vtec kicked in, vtec sound, vtec kicked in yo, vtec compilation, vtec meme, vtech kicking in, vtec explained, vtec turbo, saturn vue, cam profile, engine 101, vtec 101, what is vtec, how to, vtec tutorial, sohc, dohc, v6
