how VTEC works
23-Oct-2007, 11:58 AM
#1
how VTEC works
http://www.youtube.com/watch?v=AcT_ZyY3F0k
this is good 4 some people that don't understand.
http://www.youtube.com/watch?v=q24D0xv49d4
x-ray video of vtec
this is good 4 some people that don't understand.
http://www.youtube.com/watch?v=q24D0xv49d4
x-ray video of vtec
Last edited by Sirberner; 09-Nov-2007 at 12:39 PM.
02-Nov-2007, 09:39 PM
#5
Senior Member
Join Date: Sep 2007
Location: Newmarket
Posts: 160
i miss my vtec
mabie next year 
i had a deamon d16y8 it was pozesed and i have no idea why i baught it and was told it was stock mm no
vtec kicked in at 4g and the tires squeeled every time and it did that 4 about a year then then boom
take a listen
http://video.google.ca/videoplay?doc...arch&plindex=6
mabie next year i had a deamon d16y8 it was pozesed and i have no idea why i baught it and was told it was stock mm no
vtec kicked in at 4g and the tires squeeled every time and it did that 4 about a year then then boom
take a listen
http://video.google.ca/videoplay?doc...arch&plindex=6
03-Nov-2007, 12:13 PM
#6
Junior Member
Join Date: Oct 2007
Posts: 18
http://www.youtube.com/watch?v=AcT_ZyY3F0k
this is good 4 some people that don't understand.
http://www.youtube.com/watch?v=q24D0xv49d4
x-ray video of vtech
this is good 4 some people that don't understand.
http://www.youtube.com/watch?v=q24D0xv49d4
x-ray video of vtech
you guys are kidding right? or are you seriously calling it "VTECH"?
do you not have VTEC engines or are you just stupid?
yea 01 "automatic" LX with D17A1 dont have it so u wouldn't know
09-Nov-2007, 01:13 PM
#12
-me 
- you
09-Nov-2007, 03:11 PM
#13
Junior Member
Join Date: Sep 2007
Posts: 15
isnt it like variable valve timeing and lift well variable timiming electronic control?
being able to adjust when ur valves open n close?
VTEC not vtech, thats what my home phon eis, so i dont think my phone kicks in at 4000 rpm:S?
here is a simple explanation,
VTEC (which stands for Variable Valve Timing and Lift Electronic Control) is an electronic and mechanical system in some Honda engines that allows the engine to effectively have multiple camshafts. As the engine moves into different rpm ranges, the engine's computer can activate alternate lobes on the camshaft and change the cam's timing. In this way, the engine gets the best features of low-speed and high-speed camshafts in the same engine. Several of the links below
being able to adjust when ur valves open n close?
VTEC not vtech, thats what my home phon eis, so i dont think my phone kicks in at 4000 rpm:S?
here is a simple explanation,
It turns out that there is significant relationship between the way the lobes are
ground on the camshaft and the way the engine performs in different rpm(rotations per minute) ranges. To understand why this is the case, imagine that we are running an engine extremely slowly -- at just 10 or 20 rpm, so it takes the piston seconds to complete a cycle. It would be impossible to actually run a normal engine this slowly, but imagine that we could. We would want to grind the camshaft so that, just as the piston starts moving downward in the intake stroke, the intake valve would open. The intake valve would close right as the piston bottoms out. Then the exhaust valve would open right as the piston bottoms out at the end of the combustion stroke and would close as the piston completes the exhaust stroke. That would work great for the engine as long as it ran at this very slow speed.
When you increase the rpm, however, this configuration for the camshaft does not work well. If the engine is running at 4,000 rpm, the valves are opening and closing 2,000 times every minute, or thirty to fourty times every second. When the intake valve opens right at the top of the intake stroke, it turns out that the piston has a lot of trouble getting the air moving into the cylinder in the short time available (a fraction of a second). Therefore, at higher rpm ranges you want the intake valve to open prior to the intake stroke -- actually back in the exhaust stroke -- so that by the time the piston starts moving downward in the intake stroke, the valve is open and air moves freely into the cylinder during the entire intake stroke. This is something of a simplification, but you get the idea. For maximum engine performance at low engine speeds, the valves need to open and close differently than they do at higher engine speeds. If you put in a good low-speed camshaft, it hurts the engine's performance at high speeds, and if you put in a good high-speed camshaft it hurts the engine's performance at low speeds (and in extreme cases can make it very hard to start the engine!). ground on the camshaft and the way the engine performs in different rpm(rotations per minute) ranges. To understand why this is the case, imagine that we are running an engine extremely slowly -- at just 10 or 20 rpm, so it takes the piston seconds to complete a cycle. It would be impossible to actually run a normal engine this slowly, but imagine that we could. We would want to grind the camshaft so that, just as the piston starts moving downward in the intake stroke, the intake valve would open. The intake valve would close right as the piston bottoms out. Then the exhaust valve would open right as the piston bottoms out at the end of the combustion stroke and would close as the piston completes the exhaust stroke. That would work great for the engine as long as it ran at this very slow speed.
VTEC (which stands for Variable Valve Timing and Lift Electronic Control) is an electronic and mechanical system in some Honda engines that allows the engine to effectively have multiple camshafts. As the engine moves into different rpm ranges, the engine's computer can activate alternate lobes on the camshaft and change the cam's timing. In this way, the engine gets the best features of low-speed and high-speed camshafts in the same engine. Several of the links below
nice! but the video says it all!
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