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Confused about sohc vtec vs dohc vtec vs dohc non vtec and so on.

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    #1

    Confused about sohc vtec vs dohc vtec vs dohc non vtec and so on.

    Maybe a noob Question ? im a lil confused dohc (vtec) = Variable Valve Timing has twin cam's. Now im looking for a motor for my car not trying to do a swap or anything special to get more power but i found a f22b dohc and its non vtec can get it for 500 bucks. Whats the advantages in vtec, non vtec sohc, dohc if any ??

    sohc - same cam profile used all the time
    dohc vtec- larger cam runs with is given rpm range = more power
    dohc non vtec ? assume it just uses both cams all the time ???
    sohc vtec - How the hell does that work with one cam ? lol do the lobe expand with rpm's ? << j/k but really dont know how it works?
    Thanks.... btw being held up on the sportline install freaking siezed bolt !! thanks to cpmike for the diy.
    Tags: None
    #2
    non-vtec sohc: is the same cam profile everytime

    non-vtec dohc: same cam profile everytime, easy to tune with 2 cams

    vtec sohc: when oil pressure hits a certain psi it tells the computer to open up the vtec solenoid to engage the secondary and high rockers to lock together on those cam lobes. thena when vtec works

    vtec dohc: same as above but its alot harder

    if i did not say something right help a kid out

    Comment

      #3
      I think its just dohc---- dual overhead cam shaft. more power.

      sohc---single overhead cam shaft. Less power. better fuel economy.

      vtec----increases mpg and has some hp gains.


      i think. This is what i've always thought.
      my 91 cb7
      Originally posted by 4doorfury
      I swear, if I hit a raccoon I'll just keep pushing him, there's no way he's going to fit underneath the car

      Comment

        #4
        Sohc doesnt give better fuel economy, its all in how you drive it. The Sohc engines have less power in comparison due to the lower flow charicteristics(sp).
        Its all in how you drive the car. We dont have v8's, the 4 is always nice to the gas tank.

        VTAK is just for more power, and higher lift in the higher rpm's which allows the power to continue to rise. In comparison, the standard camshaft has to be set to one setting at which it makes peak power at a certain point, the VTAK!!! Cam can make power at 2 different points.

        So...
        Sohc- low flow
        Dohc-Higher flow
        Sohc VTAK!!- Low Flow, Slightly modded cam for higher rpm power
        Dohc VTAK!!- Higher flow, Modded cam for higher rpm power.
        Last edited by Direthought; 02-12-2006, 11:15 AM.

        Comment

          #5
          he right^^^^^

          Comment

            #6
            Originally posted by Direthought
            Sohc doesnt give better fuel economy, its all in how you drive it. The Sohc engines have less power in comparison due to the lower flow charicteristics(sp).
            Its all in how you drive the car. We dont have v8's, the 4 is always nice to the gas tank.

            VTAK is just for more power, and higher lift in the higher rpm's which allows the power to continue to rise. In comparison, the standard camshaft has to be set to one setting at which it makes peak power at a certain point, the VTAK!!! Cam can make power at 2 different points.

            So...
            Sohc- low flow
            Dohc-Higher flow
            Sohc VTAK!!- Low Flow, Slightly modded cam for higher rpm power
            Dohc VTAK!!- Higher flow, Modded cam for higher rpm power.
            what the hell is vtak? do they make phones?...no thats vtech...hmmmm

            Comment

              #7
              Originally posted by Direthought
              Sohc doesnt give better fuel economy, its all in how you drive it. The Sohc engines have less power in comparison due to the lower flow charicteristics(sp).
              Its all in how you drive the car. We dont have v8's, the 4 is always nice to the gas tank.

              VTAK is just for more power, and higher lift in the higher rpm's which allows the power to continue to rise. In comparison, the standard camshaft has to be set to one setting at which it makes peak power at a certain point, the VTAK!!! Cam can make power at 2 different points.

              So...
              Sohc- low flow
              Dohc-Higher flow
              Sohc VTAK!!- Low Flow, Slightly modded cam for higher rpm power
              Dohc VTAK!!- Higher flow, Modded cam for higher rpm power.
              vtec is not just for more power....its also for fuel economy. thats the reason honda came up with it in the first place.

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