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    #1

    Timing Question

    The crankshaft does the same thing each rotation, correct? It doesn't make the pistons go up and down differently on rotation 1 and rotation 2, right?
    Me: "I can't wait to redline my car!"
    Mark: "Didn't you just break a rocker arm?"
    Me: "Yeah, I don't think I've learned my lesson."
    Mark: "You never will."
    Tags: None
    #2
    Correct.

    Take a look at these:

    How Car Engines Work
    http://auto.howstuffworks.com/engine3.htm
    It's the reason you can put the pedal to the metal and go from 0 to 60 in seconds. But to the uninitiated, an engine can look like a jumble of metal and wires.

    and
    Types of Engines
    http://auto.howstuffworks.com/engine-inline.htm
    The types of engines you'll learn about in this section include diesel, rotary, HEMI, stirling and quasiturbine, to name a few. You'll also see photos and animated images of the technologies we explore.
    - Sean Hayes

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      #3
      every 360 rotation of the crank shaft each piston goes up and down..... but the cam shaft turns half as fast

      http://www.westwerksauto.com

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        #4
        Phew! Just making sure! I was cleaning stuff and moving the crank around, and I miscounted the two rotations. I was just hoping I didn't mess things up!
        Me: "I can't wait to redline my car!"
        Mark: "Didn't you just break a rocker arm?"
        Me: "Yeah, I don't think I've learned my lesson."
        Mark: "You never will."

        Comment

          #5
          The crank spins twice for each completion of the firing order, tha cam spins half as fast, so it spins once per firing order. This is the same for all 4 stroke engines, regardless of the number of cylinders.

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            #6
            not true douche......... DOHC

            http://www.westwerksauto.com

            Comment

              #7
              Originally posted by e30evolution
              not true douche......... DOHC
              DOHC is set up the same way, the crank spins twice and each cam will spin once.
              Can I have some proof to back up your case? Or must you call people names to prove your point? I see no evidence. :roll:

              How Car Engines Work
              http://auto.howstuffworks.com/engine4.htm
              It's the reason you can put the pedal to the metal and go from 0 to 60 in seconds. But to the uninitiated, an engine can look like a jumble of metal and wires.

              Here's a nice link for you, read up.

              Comment

                #8
                Same for DOHC. The cams turn at half speed.
                Adam Fogg- '88 M3

                Common sense- It's the new 'gifted'

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