Bob,
Why does it matter whether you are running a dry or wet sump oiling system as to whether you can plumb an
oil thermostat? You say your
oil comes from the pump, through the filter, through the cooler and then into the
oil galleries in the block. That's the same as we're running on our wet sumps. So why can't you replumb the oil cooler and install the oil thermostat? I don't understand why the dry sump system is any different (please excuse my ignorance if this is a dumb question
). Why would you have an extra restriction due to the thermostat? Until the oil reaches the oil t-stat opening temperature, it just bypasses the cooler and returns the (uncooled) oil directly back to the engine. Once (or, more appropriately,
if) the oil warms up, the thermostat then routes the oil through the cooler and back to the engine. It would require replumbing the lines going from your filter to your cooler and from your cooler to your motor, but that's about it. What size oil line are you running?
Mike