Variable Valve Timing with intelligence (TOYOTA)
VVT-i, or Variable Valve Timing with intelligence, is an automobile variable valve timing technology developed by Toyota, similar in performance to the BMW's VANOS. The Toyota VVT-i system replaces the Toyota VVT offered starting in 1991 on the 5-valve per cylinder 4A-GE engine. The VVT system is a 2-stage hydraulically controlled cam phasing system.
VVT-i, introduced in 1996, varies the timing of the intake valves by adjusting the relationship between the camshaft drive (belt, scissor-gear or chain) and intake camshaft. Engine oil pressure is applied to an actuator to adjust the camshaft position.
What is VTEC and How Does it Work? - EricTheCarGuy
What is VTEC and How Does it Work? - EricTheCarGuy
I've been editing some full length video this week and I came across this bit from a car I worked on last spring. The animations are courtesy Honda Motor Company, thanks guys. I think the title is self explanatory and I hope the video makes it a little clearer for those who are curious about this system and how it works. I've had a couple of requests for this and I hope this answers those questions.
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Comp Cams - How it's Made
Competition Cams, one of the industry leaders in performance engine equipment, walks PowerTV through the complex process of designing, creating and manufacturing its high performance cam shafts.
Toyota VVT-iE, Variable Valve Timing
Toyota VVT-iE, Variable Valve Timing
Describes the operation of the Toyota VVT-iE or variable valve timing with Intelligence Electronic. This is Toyota's highest state of the art variable valve timing system, which uses a small electric motor/actuator to advance or retard the valve timing. By varying the speed of the motor, the system is able to change follow the CAM sprocket, increase speed to advance or decrease speed to retard. The end result is a fast acting and accurate CAM timing control system. See how it works and why.
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How an engine works - comprehensive tutorial animation featuring Toyota engine technologies
Animation I created for Toyota that gives an overview of the components of an engine, how an engine works and some of Toyota's valve, intake and Exhaust technologies. I wrote, directed and storyboarded the video. It was for training purposes only.
www.curvedspacecreative.com
See other videos at:
http://www.youtube.com/watch?v=zA_19bHxEYg
http://www.youtube.com/watch?v=UpP6WYKrtS4
http://www.youtube.com/watch?v=MMrBDdLGB20
http://www.youtube.com/watch?v=hwwXukJaTlM
$0.00 Performance Upgrade - EricTheCarGuy
$0.00 Performance Upgrade - EricTheCarGuy
http://www.ericthecarguy.com/
Yea, it's true something as simple as this can increase performance, just make sure you don't get it too tight and have fun impressing your friends with this cool little trick.
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Visit me at EricTheCarGuy.com
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Due to factors beyond the control of EricTheCarGuy, it cannot guarantee against unauthorized modifications of this information, or improper use of this information. EricTheCarGuy assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. EricTheCarGuy recommends safe practices when working with power tools, automotive lifts, lifting tools, jack stands, electrical equipment, blunt instruments, chemicals, lubricants, or any other tools or equipment seen or implied in this video. Due to factors beyond the control of EricTheCarGuy, no information contained in this video shall create any express or implied warranty or guarantee of any particular result. Any injury, damage or loss that may result from improper use of these tools, equipment, or the information contained in this video is the sole responsibility of the user and not EricTheCarGuy.
K20A2 iVTEC Cam Rocker System
This video shows how the iVTEC cam rockers work on the K20A2 engine found in the Acura RSX Type-S. This same design is applicable to several other Honda K-Series engines such as, but not limited to, the K20Z1, K20Z3, K24A2, etc.
VVT, Problem
A little help for ebay friend, describes the operation of the vvt system in a 2.4 camry
Honda Civic EK3 H22A
Latest movie of this car! http://www.youtube.com/watch?v=_il00z_mk00
see photostory of building this project here
http://www.youtube.com/watch?v=doqWlWmxyiA
it looks much different now
Sistema de distribucion variable VTC
La distribución de válvulas variable es un sistema que hace variar el tiempo de apertura y cierre de las válvulas de admisión de aire (o escape de gases) en un motor de combustión interna alternativo, especialmente de ciclo Otto,en función de las condiciones de régimen y de carga motor con objeto de optimizar el proceso de renovación de la carga. El objetivo final es mejorar el rendimiento volumétrico en todas las circunstancias, sin recurrir a dispositivos de sobrealimentación.
Distribución variable de un Nissan VQ35HR
[editar] Funcionamiento
La proporción de masa de mezcla aire/combustible que realmente entra comparada con la que podría entrar, depende del tiempo disponible entre que abren y cierran las válvulas de admisión y escape. Con objeto de dinamizar este proceso, hay un momento (ver diagrama) en que las dos válvulas ( o cuatro) están abiertas a la vez, es lo que se denomina "cruce de válvulas".
En las zonas de bajas rpm, un cruce reducido favorece un ralentí estable y unas emisiones bajas. En altas rpm, el poco tiempo disponible requiere un mayor cruce, especialmente con elevada carga motor. Hasta hace pocos años, se calculaba el diagrama de distribución para obtener un compromiso entre las dos situaciones.
Al modificarse el tiempo de descarga o salida entre el cierre de las válvulas de escape y la apertura de las de admisión, varía el llenado de mezcla aire/combustible , obteniendo lo mejor de las dos situaciones en el comportamiento del motor para que sea óptima la combustión, dando por resultado un mayor aprovechamiento del combustible, emisiones de escape más limpias y máximo par motor.
El sistema VVT-i tiene la ventaja de ofrecer una distribución por válvulas continuamente variable (no escalonada) y permite que la Unidad de Control de Motor especifique la distribución óptima de acuerdo a las condiciones de manejo. La combustión más completa a mayor temperatura significa que se producirán menos emisiones de óxido nitroso. Con el VVT-i a menores velocidades del motor se produce un reciclaje del combustible sin quemar, lo que reduce los hidrocarburos no quemados. Esto da como resultado un mejor consumo de combustible.
Este sistema utiliza la presión hidráulica para modificar la posición del árbol de levas de las válvulas de admisión en relación con el cigüeñal del motor. La posición del árbol de levas puede avanzarse o retrasarse en 60 grados de ángulo del cigüeñal.
Subaru Impreza 10000 RPM engine
Takhle vypada subaru motor kteremu upadne ventil v 10000 otackach. - This is Subaru engine, broken valve in 10000 RPM. This was not poorly tuned, EGT and AFR was right, Problem was in material of one of the Cosworth valves, there was air bubble in it and it broke apart. This was not one shot as you think, this car was running few months before this and it is running again fine after repair. But we changed manufacturer of vents :-)
