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VF series 1 ss turbo

Discussion in 'VF Holden Commodore (2013 - 2017)' started by Clay1391, Jan 1, 2020.

  1. Daniel Souza

    Daniel Souza Active Member

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    I was about to ask if one could just replace the cam without doing the delete. But it is 46c outside and I don’t want to move at all. So after a quick search I found an interesting article about DOD

    http://www.superchevy.com/how-to/engines-drivetrain/0405sc-gmdod/

    Quote from the article:

    “.....
    Operationally, the LH6 always deactivates the same four cylinders in the firing order (1, 4, 6 and 7). According to Meaghan, lifter design and pushrod length are the same for all eight cylinders, but camshaft lobe profiles are different for the cylinders, which are deactivated. (This seems, in part, to contradict the GM media website, which states, "...in displacement-on-demand equipped engines, half of the cylinders have unique two-piece valve lifters..." -this being an important stipulation for those wanting to swap camshafts.)

    For hot rodders wanting to modify their DOD-equipped LH6s, it's important to know that the switching lifter has a lift limitation of 15mm (at the valve). The factory cam uses 12.2mm of that (about .480 inch), giving the LH6 a theoretical valve lift limit of .590 inch. It's worth noting that this limit is for the lifter; a different valve spring would almost surely have to be used at this valve lift. Interestingly, it seems possible to grind a custom camshaft, which would only provide increased lift and duration to the non-DOD cylinders (2, 3, 5 and 8), thus allowing higher lift with standard non-switching lifters in those cylinders.
    .....
     
  2. abuch47

    abuch47 Active Member

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  3. lmoengnr

    lmoengnr Well-Known Member

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  4. abuch47

    abuch47 Active Member

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    Well having been in contact with dirk for a while im trying to follow his footsteps but its proving difficult to source the info.
     
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