Engine Making Metal (Was: Nasa Icing courses)
Lycoming is starting to offer roller tappets.
Roller tappets however will increase the Herzian compressive stresses
on the cam (and on the roller) when compared to a flat tappet surface.
It isn't necessarily a cure all.
I suspect radial engines use roller tappets because of the
comparatively high velocities between the cam and the tappet.
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