The document discusses Honda's i-VTEC (Variable Valve Timing and Lift Electronic Control) engine technology. It works by using two camshaft profiles and electronically selecting between them to improve engine efficiency. The basic mechanism uses a hydraulically actuated pin to switch between cam lobes. At low speeds it uses a low-lift cam profile for efficiency, switching to a high-lift profile for more power at higher speeds. i-VTEC provides benefits like better fuel efficiency and torque but also has limitations like increased costs and complexity.

1. GLA University
i-vtec engine technology
Submitted By :- Submitted To :-
Rahul Soni Mr. R P Singh
Sec:- F Mr. Shashank Srivastava
Roll No:- 121200229 (07)

2. Contents
 Introduction
 Basic Mechanism
 Principals
 I-VTEC Controller
 Series of VTEC engine
 I-VTEC
 I-VTEC in Motorcycles
 Advantages
 Limitations
 Future of I-VTEC

3. INTRODUCTION
 I-VTEC (Variable Valve Timing and Lift Electronic
Control) is a valve train system developed by Honda
 improve the volumetric efficiency of a four stroke internal
combustion engine .
 The I-VTEC system uses two camshaft profiles and
electronically selects between the profiles.
 It was invented by Honda engineer Ikuo Kajitani.
 This was the first system of its kind.

4. BASIC MECHANISMS
 The basic mechanism used by the i-vtec
technology is hydraulically actuated pin.
 Pin reached to rocker arms.
 A spring mechanism used to
return the pin back.
 Comprises of two camshaft
lobes.

5. WORKING:-

6.  This is done by running in a low speed valve timing
and small cam profile at low engine speeds for
improved fuel consumption and leaner fuel burning.
On the other hand, when the engine needs more
power a higher output is achieved through the i-VTEC
system by speeding up the valve timing and switching
to the larger cam profile which allows for a further
and longer valve opening time.

7. PRINCIPALS
 One of the cam lobes on the left hand have a
wider profile , opens its valve earlier.
 For more time and close it later in compare
to the other.
 The fuel is allowed to enter through one
valve completely , while other valve opens
partly.

8. i-VTEC CONTROLLER
 Basically a RPM activated.
 ECU used to switch cams to early/late.

9. SERIES OF VTEC ENGINES
 SOHC VTEC
 VTEC –E
 3 STAGE VTEC
 I- VTEC
 K-series
 R-series

10. I-VTEC
 The intake camshaft is now capable of
advancing between 25 and 50 degrees.
 Phasing is implemented by a computer-
controlled, oil-driven adjustable cam gear.
 I-VTEC V6 that includes Honda's cylinder
deactivation technology.

11. i-VTEC IN MOTORCYCLES
 Firstly used in 2003 in sports bikes.
 One intake valve remains closed until a threshold of
7000 rpm is reached.
 Second valve is opened by an oil-pressure actuated
pin.
 Uses a single camshaft to provide two timing
routines for the intake .

12. ADVANTAGES
 Better fuel efficiency.
 High initial torque with relevant high power.
 Lower emission.
 Strong performance.

13. LIMITATIONS
 Higher cost of engine.
 More complex mechanism.
 Wear and Tear problems.
 Failed to overcome turbo charging.
 Decreased engine life.

14. FUTURE OF i-VTEC
 Implementation on performance engines.
 Better opportunities of higher petroleum
prices.
 Consideration on its disadvantages gives
improvement in it.
 Economy and satisfaction to be estimated.

15. REFRENCES
 WIKIPEDIA.ORG
 SEMINARTOPICS.COM
 PAPERPRESENTATION.COM

16. C
HTF