Dry engine

[JPerkins]

Bluejeepdad makes sense. I know for brake in on a auto camshaft your supposed to "idle" at 2000rpm for 20 minutes .

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[bluejeepdad]

-is that the only way the cam gets oiled in an O-290d is oil being splashed on it?

The oil level in the sump is below the crankshaft so it's not like some simple engines that have a splash lubrication system where the crank and rod dip in to the oil and sling it up. With pressure lubricated engines the oil is fed to the crankshaft and camshaft bearings where it squirts out the ends of each bearing and onto the surfaces of the rotating crank and cam. That sprays the oil over everything inside the crankcase including the cam lobes.

Tim

[Pacerfgoe]

I go even higher; 1700 rpm or so. The contact load between the cam lobes and the tappet faces is highest at idle and goes down as speed increases (opposite of what you'd think). So going to a higher speed minimizes the chance of cam/tappet damage. Of course you don't want to use too much throttle too soon before the engine has warmed up evenly. IIRC 1700 is what they use at the factory.

Tim

Pick an RPM.....just don't let the thing idle.