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what is VTEC

Discussion in 'Civic and CRX - EF' started by 8ballsin, Feb 27, 2008.

  1. 8ballsin

    8ballsin New Member

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    what is vtec and what exactly is the difference than non vtec
     
  2. INJEN78

    INJEN78 HS LEGEND

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    are you serious?!?!?
     
  3. 8ballsin

    8ballsin New Member

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    yes i just got a 90 crx and to give you little background of my i am a redneck that only drives 4x4's im here in germany and cannot afford the gas so i bought a honda
     
  4. 90_EF_Hatch

    90_EF_Hatch Señor Member

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  5. efhondakid

    efhondakid My name is Byron. VIP

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    Easy now, you were a noob once too.
     
  6. INJEN78

    INJEN78 HS LEGEND

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    dude all you have to do is go to a search bar and type in "what is vtec" or "how does vtec work" i guarantee there will be millions of sites that you can read...vtec is probably the most searched word in the world
     
  7. Mugen Accord

    Mugen Accord West West Y'all

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    Here is a basic definition of VTEC:

    In the regular four-stroke automobile engine, the intake and exhaust valves are actuated by lobes on a camshaft. The shape of the lobes determines the timing, lift and duration of each valve. Timing refers to an angle measurement of when a valve is opened or closed with respect to the piston position (TDC or BDC). Lift refers to how much the valve is opened. Duration refers to how long the valve is kept open. Due to the behavior of the working fluid (air and fuel mixture) before and after combustion, which have physical limitations on their flow, as well as their interaction with the ignition spark, the optimal valve timing, lift and duration settings under low RPM engine operations are very different from those under high RPM. Optimal low RPM valve timing, lift and duration settings would result in insufficient filling of the cylinder with fuel and air at high RPM, thus greatly limiting engine power output. Conversely, optimal high RPM valve timing, lift and duration settings would result in very rough low RPM operation and difficult idling. The ideal engine would have fully variable valve timing, lift and duration, in which the valves would always open at exactly the right point, lift high enough and stay open just the right amount of time for the engine speed in use.
    VTEC was initially designed to increase the power output of an engine to 100 ps/liter or more while maintaining practicality for use in mass production vehicles. Some later variations of the system were designed solely to provide improvements in fuel efficiency, or increased power output as well as improved fuel efficiency.
    In practice, a fully variable valve timing engine is difficult to design and implement.
    The opposite approach to variable timing is to produce a camshaft which is better suited to high RPM operation. This approach means that the vehicle will run very poorly at low RPM (where most automobiles spend much of their time) and much better at high RPM. VTEC is the result of an effort to marry high RPM performance with low RPM stability.
    Additionally, Japan has a tax on engine displacement, requiring Japanese auto manufacturers to make higher-performing engines with lower displacement. In cars such as the Toyota Supra and Nissan 300ZX, this was accomplished with a turbocharger. In the case of the Mazda RX-7 and RX-8, a rotary engine was used. VTEC serves as yet another method to derive very high specific output from lower displacement motors.
     
  8. D15Beater

    D15Beater HNFTuning

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  9. |Chaz|

    |Chaz| Well-Known Member VIP

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    That was a really good video D15beater. Very easy to understand, if it doesn't help the guy that created the thread, I don't know what will.
     
  10. whiterabbit06

    whiterabbit06 Why oh why didn't I take the blue pill? VIP

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  11. INJEN78

    INJEN78 HS LEGEND

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  12. LS_VTEC

    LS_VTEC you get the BRAKE

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    Variable valve timing and electronic lift control
     
  13. awptickes

    awptickes unimpressed by you VIP

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    Where in germany are you?
     
  14. 8ballsin

    8ballsin New Member

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    I am in Heidelberg
     
  15. khrisb

    khrisb ******

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    i'm pretty sure I've read somewhere other than wikipedia that honda didn't invent variable valve timing
     
  16. D15Beater

    D15Beater HNFTuning

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  17. Celerity

    Celerity Well-Known Member

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    Aw Pee Tickles and Eight Balls In are together in Germany.


    GREAT.
     
  18. Mugen Accord

    Mugen Accord West West Y'all

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    I Liked The Video D15Beater. Also Checked Out The Turbo'd VTEC Vid As Well
     
    1 person likes this.
  19. phyregod

    phyregod !!YTINASNI

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    It is no longer VTEC.

    Its "mAd VEETACH off the HiZzY yO!

    damn noobs.
     
  20. INJEN78

    INJEN78 HS LEGEND

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    LIES!!!

    its m@d TyT3 jDm Vt3c s0n!1!1!1!
     
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