EDM flat tappet lifters

Fast Eddie

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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.
 

robs ss

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

lcrken

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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
 

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