How VTEC works ?

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iVTEC How it Works -EricTheCarGuy
iVTEC How it Works is a long standing requested video. Back with I did the video on the VTEC explanation I was asked about doing a video on iVTEC which is slightly different than VTEC. First you need to understand the basic operation of the cam shaft, once you have that, and you know a little about how that cam shaft effects performance, you can then begin to understand how iVTEC works. In essence, as far as the Honda system is concerned, it varies the cam 'timing' to optimize performance and fuel economy. Many companies employ similar systems to this but they may perform the operation differently. This video focuses on the Honda iVTEC system. That said, you may notice that the VTEC system on this K series is a little different in that instead of having a cam with a higher lift and duration, it switches between 1 and 2 valves on the intake side. So when VTEC engages on this engine it actually activates another valve in the cylinder instead of changing lift and duration. It still alters cam timing via the iVTEC system however. Once again, to optimize power output and fuel economy. Either way, I hope this video helps with your understanding of camshafts, cam timing, lift, duration, VTEC, and iVTEC systems. Thanks for watching. The best place for answers to your automotive questions: http://www.ericthecarguy.com Related Videos How VTEC Works: https://www.youtube.com/watch?v=nc800hkqY2M The Basic Parts of an Engine: https://www.youtube.com/watch?v=saPGX-1qC4M How Oil Pressure Works: https://www.youtube.com/watch?v=8f2fcbTh5yw K Series Valve Adjustment: https://www.youtube.com/watch?v=959I0wF5NH8 F Series Valve Adjustment 2.2L: https://www.youtube.com/watch?v=P7wI4EtZSaA B18C VTEC Valve Adjustment: https://www.youtube.com/watch?v=RDrw42_KuZY B18B Valve Adjustment: https://www.youtube.com/watch?v=-G_Nq2orpfo J Series Valve Adjustment (Part 1): https://www.youtube.com/watch?v=OnyqVg3nWRk J Series Valve Adjustment (Part 2): https://www.youtube.com/watch?v=iLdgivYwUiQ Useful articles. HVAC problems http://www.ericthecarguy.com/faq/solving-automotive-hvac-problems Engine overheat http://www.ericthecarguy.com/faq/what-to-do-when-your-engine-overheats No start problems http://www.ericthecarguy.com/faq/solving-automotive-no-start-problems Idle issues http://www.ericthecarguy.com/faq/solving-automotive-idle-problems Performance issues http://www.ericthecarguy.com/faq/solving-automotive-performance-issues Diagnosing Noises http://www.ericthecarguy.com/faq/diagnosing-noises-in-your-car Diagnosing Vibrations http://www.ericthecarguy.com/faq/determining-the-causes-of-vehicle-vibratio ns Electrical Problems http://www.ericthecarguy.com/faq/solving-automotive-electrical-problems Brake Issues http://www.ericthecarguy.com/faq/solving-brake-problems Transmission issues http://www.ericthecarguy.com/faq/solving-transmission-problems Buying a Used Car http://www.ericthecarguy.com/faq/what-to-look-for-in-a-used-car-purchase Leaks http://www.ericthecarguy.com/faq/finding-and-fixing-leaks MPG http://ericthecarguy.com/faq/finding-and-fixing-the-causes-of-poor-mpg EricTheCarGuy code lookup: http://www.ericthecarguy.com/obd-code-lookup The best place for answers to your automotive questions: http://www.ericthecarguy.com Discussion about this video: http://www.ericthecarguy.com/kunena/18-The-EricTheCarGuy-Video-Forum/55532- ivtec-how-it-works#122861 Social Media Links. Facebook: https://www.facebook.com/EricTheCarGuy?fref=ts Twitter: https://twitter.com/EricTheCarGuy Google+: https://plus.google.com/100195180196698058780/posts Instagram: http://instagram.com/ericthecarguy Information on Premium Membership: http://www.ericthecarguy.com/premium-content-streaming-etcg-content Stay Dirty ETCG 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.





How VTEC Works
READ THE DESCRIPTION BELOW - VTEC (Variable Timing and Lift Electronic Control) is a system developed by Honda to improve the volumetric efficiency of a four-stroke internal combustion engine. The VTEC system uses two camshaft profiles and hydraulically selects between profiles. It was invented by Honda engineer Ikuo Kajitani, and was the first system of its kind.[citation needed] It is distinctly different from standard VVT (variable valve timing) which advances the valve timing only and does not change the camshaft profile or valve lift in any way. The VTEC system provides the engine with multiple cam lobe profiles optimized for both low and high RPM operations. In basic form, the single barring shaft-lock of a conventional engine is replaced with two profiles: one optimized for low-RPM stability and fuel efficiency, and the other designed to maximize high-RPM power output. 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. Using these inputs, the ECU is programmed to switch from the low lift to the high lift cam lobes when the conditions mean that engine output will be improved. At the switch point a solenoid is actuated which allows oil pressure from a spool valve to operate a locking pin which binds the high RPM cam follower 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. The switch-over point is variable, between a minimum and maximum point, and is determined by engine load. The switch-down back from high to low RPM cams is set to occur at a lower engine speed than the switch-up (representing a hysteresis cycle) to avoid a situation in which the engine is asked to operate continuously at or around the switch-over point. The older approach to timing adjustments is to produce a camshaft with a valve timing profile that is better suited to low-RPM operation. The improvements in low-RPM performance occur in trade for a power and efficiency loss at higher RPM ranges, which is where most street-driven automobiles operate a majority of the time. Correspondingly, VTEC attempts to combine low-RPM performance with high-RPM stability. Honda Civic, CRX, Del Sol, Integra, GSR, Accord, Prelude, VTEC, DOHC, CTR, ITR, Civic Type R, Integra Type R, LS VTEC, B20VTEC, Spoon, Mugen, OBD0 - OBD1, Jumper Harness, Hondata, EX, LX, CX, VX, GS, LS, RS, SiR, Cams, Blox, Skunk2, Acura, turbo, NOS, Nitrous, Pistons, Crankshaft, Camshaft, Header, 4-1 Header, Stainless Steel, Exhaust, N1, Greddy, HKS, ES Tuning, Muffler, RSR, Apexi, Rota, Drag, SSK, Spun, Konig, Coilovers, Lowering Springs, camber Kit, Tein, H&R, Megan Racing, Tanabe, accord, prelude, cams, camshaft, header, headers, strut bars, axles, shift linkage GOLf,toyota lexus ipod iPod IPOD Integration wheels mr5s ef ef9 ed ed6 ed7 rage rmf bisimoto azenis asr blox 5pt 6pt time attack autocross track nitto honda civic integra b series jdm headers jasma spoon toda crower skunk 2 blox asr itr da9 ef ef9 eg ek dc da test pipe stright pipe Rhd jdm honda civic si hb ek em dc da db eg.ef K20 k24 b16a b18c1 p72 p73 itr ctr gsr bdl aebs abes blox bdl vtec acura swap engine Intercooler jdm ka24de ka24e kouki maf manifold motor nismo nissan oem rb20det rb25 rb25det rims s13 s14 s15 sale seat shell shocks silvia skyline socal spacers sportmax springs sr20 sr20det suspension swap tires trade tranny transmission turbo volk wheels wtb z32 zenki 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 fastback hatchback coupe 89 90 91 92 93 94 95 96 97 98 Nissan 240 180sx 240 240sx 300zx 350z apexi bov brakes bride bumper cheap clutch coilover coilovers coupe drift ecu engine Exhaust for sale garage411.com greddy harness hatch headlights hks injectors intake Intercooler jdm ka24d Honda Nissan Chevy ford toyota vw civic jeta gmc saturn good on gas daily Trades , Mustang , notch , notchback , foxbody , gt , 5.0 , cobra , saleen , roush , toyota , pickup , tacoma , 4runner , ford , ranger , explorer , Nissan , hardbody , frontier , sentra , maxima , Altima , camry , corolla , Honda , accord , civic, acura , mazda , kia , hyundai etc,turbo,rwd,trade,civic,race car,lotus,elise,brz,frs,miata,mazda,sparco,enkie,hatchback,drift,ae86,s13,s 14,s15,rx7,rx8,fiat,nismo,acura,miata,jdm,telsa,volkswagen,bug,prerunner,tr ade,car,Intercooler,blow off valve,





VTEC
DOHC VTEC





Honda i VTEC animazione motore Honda i VTEC animation engine
Honda i VTEC animazione motore Honda i VTEC animation engine L' I-VTEC ( VTEC intelligente ) ha introdotto la variazione continua e graduale dell'albero a camme.




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