During the last annual (November), I had the vernatherm replaced and this
did nothing.  My oil cooler setup looks like most others I have seen, with
the cooling "hole" on the back of the baffling on the pilot's side, going
through the orange tubing to the shroud on the cooler which is mounted on
the firewall.  I have some "shark vents" on that side of the cowl
presumably to let this cooling air flow as it should.
    My question is this:  I have heard of some people on the list switching
from a 7 vane to a 13 vane cooler and this solved their problem.  Do you
think it would be best for me to try this first?  Or should I go ahead and
put a dedicated naca vent on the bottom of the cowl and dedicate a cooling
hose to the cooler?  Or will this potentially cool too much? I really don't
want to do this, because I'll have to cut up the cowl and repaint,
etc.  Any suggestions would be helpful. 

Steve,

 

More info is needed. Where are you?  Is the cooler a Stewart-Warner?  Have you measured air pressure drop across cooler?