jalesi2001 Posted November 24, 2009 Share Posted November 24, 2009 Ok ok, I know, we haven't got i-VTEC, but I have had a few members ask me how it works, and how it differs from our VTEC, so heres an explaination on what it is and how it works!! Its a bit difficult to explain without pics, but here goes.... VTEC/VTCThe i-VTEC system has another unit that works with the VTEC called a VTC (Variable Valve Timing Control). It is situated on the end of the intake camshaft.This mechanism improves fuel efficiency and reduces exhaust emissions at all levels of engine speed, vehicle speed and engine load.The VTEC mechanism changes the valve lift and timing by using more than one cam profile. (like ours! )The VTC changes the phase of the intake camshaft via oil pressure. It also changes the intake valve timing continuously.So.... At light loaded running (cruising), the VTC is in its Base Position. At this point the cam angle is retarded to reduce the entry of exhaust gas into the intake port and to achieve stable fuel consumption during lean burn.At medium/high loaded running, the VTC is in its Advance Control position. At this point the VTC advances the cam angle for the EGR effect and to reduce the pumping loss. The intake valve is closed quickly to reduce the entry of the air/fuel mixture into the intake port and improve the charging effect.At high speed running, the VTC is in its Advance-Base position. At this point the cam phase angle is controlled for optimum valve timing and maximum engine power.The VTC also reduces the cam advance at idle, stabilizes combustion, and reduces engine speed. If a malfunction occurs, the VTC system is disabled and the valve timing is fixed at the fully retarded position.VTECThe VTEC system changes the cam profile to correspond to the engine speed. It maximizes torque at low engine speeds and output at high engine speeds.So basically, it has the same kind of VTEC as us, but with the added extra of being able to constantly adjust the timing for the best performance at all engine speeds, wether you are booting it or driving normally. this helps the fuel economy, emissions and best of all, performance!! Thats why its called "i-VTEC", the "i" satnds for intelligent!! So there you go, hopefully you all understand it now..... Quote Link to comment Share on other sites More sharing options...
DAVEMB2 Posted November 24, 2009 Share Posted November 24, 2009 nice one adam Quote Link to comment Share on other sites More sharing options...
Dave Posted November 24, 2009 Share Posted November 24, 2009 Superb bit of info adam Quote Link to comment Share on other sites More sharing options...
BLouro Posted October 21, 2010 Share Posted October 21, 2010 Nice, info... very good Quote Link to comment Share on other sites More sharing options...
civicturbo79 Posted October 21, 2010 Share Posted October 21, 2010 Nice write up Adam Rich. Quote Link to comment Share on other sites More sharing options...
pj46 Posted May 4, 2011 Share Posted May 4, 2011 Well explained mate, one is now a lot wiser!! Quote Link to comment Share on other sites More sharing options...
FlauM Posted May 30, 2011 Share Posted May 30, 2011 Nice info Quote Link to comment Share on other sites More sharing options...
NIKH25 Posted June 3, 2011 Share Posted June 3, 2011 Nice info Excellent Quote Link to comment Share on other sites More sharing options...
Guest Posted September 27, 2011 Share Posted September 27, 2011 good write up adam i did wonder what the I-Vtec was all about. Quote Link to comment Share on other sites More sharing options...
johngreen537 Posted September 27, 2011 Share Posted September 27, 2011 To me... It means you have to spend a fortune to map your car Quote Link to comment Share on other sites More sharing options...
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