i-VTEC engine
Currently i-VT
EC technology is available on two Honda products; the 2002 Honda CRV and the 2002 Acura RSX. Two complimenting systems are part of the i-VTEC system. Variable valve lift is accomplished by using two rocker arms and different camshaft profiles to change the opening of the valve. The other technology is a computer controlled variable camshaft actuator that can vary a camshaft up to 50 degrees relative to crankshaft angle. Let’s look at each in a little more detail.
Varying the camshaft in relation to the crankshaft is done with engine oil pressure acting on an actuator located on the end of the intake camshaft. The computer varies the oil pressure to change the rotation of the camshaft on its drive sprocket. This changes the valve overlap. Valve overlap is the amount of time both the intake and exhaust valves are open at the same time. Retarding the camshaft decreases the amount of overlap, while advancing the camshaft increases overlap.
The new 1.3L i-VTEC engine is agile and intelligent: at low engine speeds one of the two intake valves is idled. The engine sips gasoline, using a lean fuel mix at low engine speeds for further improved combustion efficiency.
Valve overlap plays an important part in engine operating characteristics. Very little overlap gives the engine a smooth idle and good slow speed torque, but it hinders high rpm engine performance. A large amount of overlap allows excellent engine breathing at high rpm but causes a rough idle and poor performance at low rpm. By varying the camshaft rotation and amount of overlap, the engine can have excellent performance at both low and high speeds.
the i-VTEC technology is now available in all new model line ups. Many would say that “oh its a very fuel saving engine and also powerful !” Little did they know that the technology was not only to save fuel, but also to be more friendly to the environment. The i-VTEC works by controlling the timing and lifting of the camshafts so that you burn less fuel in lower speeds and burn more fuel when power is needed.
So with i-VTEC, we use less fuel to cover the same mileage and when you use less fuel, it means that there is less green house gas expelled from the exhaust.
The i-VTEC engines is categorized in Tier 4 of the European Emission standards. It is found in the current Honda City emits 156g/KM of CO2 and in this Tier the limit was 500g/KM. This shows how serious Honda is in making greener engines !
i-VTEC: high power + low fuel consumption
i-VTEC regulates the opening of air-fuel intake valves and exhaust valves in accordance with engine speeds
By regulating valve opening to match engine speed, the agile i-VTEC engine adjusts its characteristics to realize both superior power and low fuel consumption.official website at http://world.honda.com/automobile-technology for detail.
Currently i-VT
EC technology is available on two Honda products; the 2002 Honda CRV and the 2002 Acura RSX. Two complimenting systems are part of the i-VTEC system. Variable valve lift is accomplished by using two rocker arms and different camshaft profiles to change the opening of the valve. The other technology is a computer controlled variable camshaft actuator that can vary a camshaft up to 50 degrees relative to crankshaft angle. Let’s look at each in a little more detail.Varying the camshaft in relation to the crankshaft is done with engine oil pressure acting on an actuator located on the end of the intake camshaft. The computer varies the oil pressure to change the rotation of the camshaft on its drive sprocket. This changes the valve overlap. Valve overlap is the amount of time both the intake and exhaust valves are open at the same time. Retarding the camshaft decreases the amount of overlap, while advancing the camshaft increases overlap.
The new 1.3L i-VTEC engine is agile and intelligent: at low engine speeds one of the two intake valves is idled. The engine sips gasoline, using a lean fuel mix at low engine speeds for further improved combustion efficiency.
Valve overlap plays an important part in engine operating characteristics. Very little overlap gives the engine a smooth idle and good slow speed torque, but it hinders high rpm engine performance. A large amount of overlap allows excellent engine breathing at high rpm but causes a rough idle and poor performance at low rpm. By varying the camshaft rotation and amount of overlap, the engine can have excellent performance at both low and high speeds.
the i-VTEC technology is now available in all new model line ups. Many would say that “oh its a very fuel saving engine and also powerful !” Little did they know that the technology was not only to save fuel, but also to be more friendly to the environment. The i-VTEC works by controlling the timing and lifting of the camshafts so that you burn less fuel in lower speeds and burn more fuel when power is needed.
So with i-VTEC, we use less fuel to cover the same mileage and when you use less fuel, it means that there is less green house gas expelled from the exhaust.
The i-VTEC engines is categorized in Tier 4 of the European Emission standards. It is found in the current Honda City emits 156g/KM of CO2 and in this Tier the limit was 500g/KM. This shows how serious Honda is in making greener engines !
i-VTEC: high power + low fuel consumption
i-VTEC regulates the opening of air-fuel intake valves and exhaust valves in accordance with engine speeds
By regulating valve opening to match engine speed, the agile i-VTEC engine adjusts its characteristics to realize both superior power and low fuel consumption.official website at http://world.honda.com/automobile-technology for detail.
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