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DOHC Vs. SOHC

  • 25-05-2009 10:22pm
    #1
    JcDubz4life
    Registered Users Posts: 62 ✭✭


    I know both are versions of the VTEC and i know what both stand for and i know that one is designed for economy and one for speed. Problem is I cant remember which is which:rolleyes:

    Thanks in advance


Comments

  • #2
    challengemaster
    Registered Users, Registered Users 2 Posts: 16,930 ✭✭✭✭challengemaster


    www.google.com

    have fun.


  • #3
    ottostreet
    Closed Accounts Posts: 4,987 ✭✭✭ottostreet


    DOHC for speed. SOHC for a running engine. lol.


  • #4
    Atomic Pineapple
    Registered Users, Registered Users 2 Posts: 18,272 ✭✭✭✭Atomic Pineapple


    DOHC = double overhead cam, so you have shift over into VTEC for the power as compared to SOHC, single overhead cam


  • #5
    JimmyCrackCorn!
    Closed Accounts Posts: 752 ✭✭✭JimmyCrackCorn!


    draffodx wrote: »
    DOHC = double overhead cam, so you have shift over into VTEC for the power as compared to SOHC, single overhead cam

    You what switch what?



    DOHC is Double overhead cam. Meaning exhaust valves and inlet valves have there own cams for better control of timing meaning better efficiency.

    SOHC is the older design where a single cam controls all the valves. This gives cruder control over timing.


    Vtech is nothing more than a more aggressive Cam profile designed to let the engine run more efficiency at higher revs while at lower revs using a milder cam to avoid a lazy engine with poor idle and economy.

    SOHC is just an older system and was not built at the time to be a sports performer and is aimed more at efficiency.

    A DOHC vtech system is significantly better for performance but the hype around what is variable valve timing confuses things allot. VTEC does not make a car a rocket ship but it does feel and sound dramatic.:rolleyes:


  • #6
    Caliden
    Registered Users, Registered Users 2 Posts: 5,982 ✭✭✭Caliden


    vtec.jpg?t=1243363700


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  • #7
    Dirty_Diesel
    Closed Accounts Posts: 160 ✭✭Dirty_Diesel


    @OP
    DOCH is around 160bhp and SOCH is around 130bhp.


  • #8
    Atomic Pineapple
    Registered Users, Registered Users 2 Posts: 18,272 ✭✭✭✭Atomic Pineapple


    Dirty_Diesel wrote: »
    @OP
    DOCH is around 160bhp and SOCH is around 130bhp.

    theres many different versions of both variations all rated differently, my DOHC VTEC is rated at 187bhp (190ps)


  • #9
    JHMEG
    Closed Accounts Posts: 7,686 ✭✭✭JHMEG


    They're not "versions of VTEC".

    On a 16-valve 4-cyl engine-

    SOHC has a single cam shaft. The camshaft opens and closes all 16 valves, 8 intake and 8 exchast, as it rotates. (Combined with VTEC it's actually more a work of art than DOHC). There is only one reason SOHC exists: one camshaft is cheaper than two.

    DOHC has one cam to open and close the 8 intake valves, and another to open an close the 8 exhaust valves. More cams = less of a compromise and valves can be controlled more precisely.

    For the last reason, DOHC VTEC engines tend to be more powerful and SOHC VTEC engines, per cubic capacity. They also look better :)


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