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EDM flat tappet lifters

Discussion in 'Norton Commando Motorcycles (Classic)' started by 84ok, Dec 2, 2019.

  1. 84ok

    84ok

    Joined:
    Aug 10, 2014
  2. Fast Eddie

    Fast Eddie VIP MEMBER

    Joined:
    Oct 4, 2013
    Looks like those lifters are pressure fed with oil, and then the additional small hole directs some of that oil to the cam lobe. Seems like a reasonable idea in that application, but...

    The lifters on our Norton’s are fed by a feeble splash of over heated oil draining from the cylinder head. So there’s nothing to feed that hole. Thus that mod isn’t applicable to ours.

    As Comnoz has pointed out before, our cam to lifter interface is lubricated primarily by splash / misting in the crank cases.
     
  3. robs ss

    robs ss VIP MEMBER

    Joined:
    Aug 16, 2016
    So long as you have your bevels oriented to deliver oil to the front.
    Found one of my four was not - failure waiting to happen!
     
  4. lcrken

    lcrken VIP MEMBER

    Joined:
    Mar 15, 2009
    If you want pressure feed to the lifter/cam interface on a Commando, the usual way is to run an oil line to the left end of the cam and drill the cam down the center, with holes drilled from the lobe faces into the central feed. Dunstall is probably the best known design of this type, but others have done it, including our own comnoz. The problem with that approach is making sure the oil pump has enough volume at high rpm to feed everything. Still, with compatible materials (and quality control during production) in lifter and cam, and proper break-in procedures, the current design seems to work pretty well for most owners.

    Ken
     
  5. marinatlas

    marinatlas

    Joined:
    Nov 4, 2007

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